imaging molecolare ad alta risoluzione spaziale ed alta efficienza f. garibaldi 09-02-04 - cv infn

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Imaging molecolare ad alta risoluzione spaziale ed alta efficienza F. Garibaldi 09-02-04 - CV INFN. - perche’ - come cosa occorre richiesta. Functional Molecular Imaging. What is needed. Submillimetric spatial resolution -High efficiency collimation is a key parameter - PowerPoint PPT Presentation

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  • Imaging molecolare ad alta risoluzione spaziale ed alta efficienzaF. Garibaldi 09-02-04 - CV INFN- perche- come cosa occorre richiesta

  • Small animal imaging, important area of bio-medical research- studying new radiopharmaceuticals- animal such mice serve as models for many studies (neural function, coronary diseases, cancer, stem cells etc.) Models of bone dismetabolism(osteoporosys)(h) Drug metabolism (m)Brain tumors ( for example, neuroblastoma in children) (h)Studying specific vs aspecific uptake of radiopharmaceuticals (m)Studying Annexin V peptide (it is taken up in apopotosys) (m)Brain activity measurements (m)Stem cells (d,w)Submillimetric spatial resolution-High efficiency collimation is a key parameter standard parallel hole collimator pinhole multipinholeTechniques - PET - intrinsic limitations- expensive - Single Photon Emission simpler technique tradeoff spatial resolution vs sensitivity and FOV

    complementarityChallenging detectorsWhat is neededSome exampleLarge collaboration is needed (physicist and M.D.)Functional Molecular Imaging

  • g = de2/16xb2pin holeparallel hole spatial resolution efficiency a = pin hole - detector distance b = pin hole - object distance d = hole aperture a = pin hole angle

  • R2486 (3 inch) R3292 (5 inch) or H8500 (Flat panel)FOV=20 mmFOV=10 mm

    Chart1

    0.430.433774

    0.430.433774

    0.440.433774

    0.440.433774

    0.450.433774

    0.550.556217

    0.550.556217

    0.560.556217

    0.560.556217

    0.570.556217

    0.670.679253

    0.670.679253

    0.680.679253

    0.680.679253

    0.680.679253

    0.790.7912881

    0.790.7912881

    0.80.7912881

    0.80.7912881

    0.80.7912881

    0.910.9117102

    0.910.9117102

    0.920.9117102

    0.920.9117102

    0.920.9117102

    1.031.0321915

    1.031.0321915

    1.041.0321915

    1.041.0321915

    1.041.0321915

    1.151.1527321

    1.151.1527321

    1.161.1527321

    1.161.1527321

    1.161.1527321

    1.271.2733320

    1.271.2733320

    1.281.2733320

    1.281.2733320

    1.281.2733320

    1.391.3939911

    1.391.3939911

    1.41.3939911

    1.41.3939911

    1.41.3939911

    counts(c/mCi/s)

    R

    rg

    c/mCi/s

    d (mm)

    R (mm)

    Resolution vs pinhole apertures and counts for different intrinsic resolution (FOV=10 m)

    tot.out

    xkddetetargriricRgc/mCi/sbdRrgc/mCi/s

    1.20.30.36300.430.140.030.430.0001137748.660.30.430.433774

    1.20.30.36300.430.270.050.430.0001137748.660.30.430.433774

    1.20.30.36300.430.410.080.440.0001137748.660.30.440.433774

    1.20.30.36300.430.540.110.440.0001137748.660.30.440.433774

    1.20.30.36300.430.680.140.450.0001137748.660.30.450.433774

    1.20.40.46300.550.140.030.550.0001762178.660.40.550.556217

    1.20.40.46300.550.270.050.550.0001762178.660.40.550.556217

    1.20.40.46300.550.410.080.560.0001762178.660.40.560.556217

    1.20.40.46300.550.540.110.560.0001762178.660.40.560.556217

    1.20.40.46300.550.680.140.570.0001762178.660.40.570.556217

    1.20.50.56300.670.140.030.670.0002692538.660.50.670.679253

    1.20.50.56300.670.270.050.670.0002692538.660.50.670.679253

    1.20.50.56300.670.410.080.680.0002692538.660.50.680.679253

    1.20.50.56300.670.540.110.680.0002692538.660.50.680.679253

    1.20.50.56300.670.680.140.680.0002692538.660.50.680.679253

    1.20.60.66300.790.140.030.790.00036128818.660.60.790.7912881

    1.20.60.66300.790.270.050.790.00036128818.660.60.790.7912881

    1.20.60.66300.790.410.080.80.00036128818.660.60.80.7912881

    1.20.60.66300.790.540.110.80.00036128818.660.60.80.7912881

    1.20.60.66300.790.680.140.80.00036128818.660.60.80.7912881

    1.20.70.76300.910.140.030.910.00048171028.660.70.910.9117102

    1.20.70.76300.910.270.050.910.00048171028.660.70.910.9117102

    1.20.70.76300.910.410.080.920.00048171028.660.70.920.9117102

    1.20.70.76300.910.540.110.920.00048171028.660.70.920.9117102

    1.20.70.76300.910.680.140.920.00048171028.660.70.920.9117102

    1.20.80.86301.030.140.031.030.00062219158.660.81.031.0321915

    1.20.80.86301.030.270.051.030.00062219158.660.81.031.0321915

    1.20.80.86301.030.410.081.040.00062219158.660.81.041.0321915

    1.20.80.86301.030.540.111.040.00062219158.660.81.041.0321915

    1.20.80.86301.030.680.141.040.00062219158.660.81.041.0321915

    1.20.90.96301.150.140.031.150.00077273218.660.91.151.1527321

    1.20.90.96301.150.270.051.150.00077273218.660.91.151.1527321

    1.20.90.96301.150.410.081.160.00077273218.660.91.161.1527321

    1.20.90.96301.150.540.111.160.00077273218.660.91.161.1527321

    1.20.90.96301.150.680.141.160.00077273218.660.91.161.1527321

    1.211.06301.270.140.031.270.00094333208.6611.271.2733320

    1.211.06301.270.270.051.270.00094333208.6611.271.2733320

    1.211.06301.270.410.081.280.00094333208.6611.281.2733320

    1.211.06301.270.540.111.280.00094333208.6611.281.2733320

    1.211.06301.270.680.141.280.00094333208.6611.281.2733320

    1.21.11.16301.390.140.031.390.00112399118.661.11.391.3939911

    1.21.11.16301.390.270.051.390.00112399118.661.11.391.3939911

    1.21.11.16301.390.410.081.40.00112399118.661.11.41.3939911

    1.21.11.16301.390.540.111.40.00112399118.661.11.41.3939911

    1.21.11.16301.390.680.141.40.00112399118.661.11.41.3939911

    tot.out

    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

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    000

    000

    000

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    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

    000

    counts(c/mCi/s)

    R

    rg

    c/mCi/s

    d (mm)

    R (mm)

    Resolution vs pinhole apertures and counts for different intrinsic resolution (FOV=10 m)

    Chart1

    0.50.5944

    0.510.5944

    0.530.5944

    0.540.5944

    0.570.5944

    0.640.641554

    0.650.641554

    0.660.641554

    0.680.641554

    0.70.641554

    0.780.782313

    0.790.782313

    0.80.782313

    0.810.782313

    0.830.782313

    0.920.923220

    0.930.923220

    0.940.923220

    0.950.923220

    0.960.923220

    1.071.064276

    1.071.064276

    1.081.064276

    1.091.064276

    1.11.064276

    1.211.25479

    1.211.25479

    1.221.25479

    1.221.25479

    1.231.25479

    1.351.346830

    1.351.346830

    1.351.346830

    1.361.346830

    1.371.346830

    1.491.488330

    1.491.488330

    1.491.488330

    1.51.488330

    1.511.488330

    1.631.629978

    1.631.629978

    1.631.629978

    1.641.629978

    1.651.629978

    counts(c/mCi/s)

    R(mm)

    Resolution vs pinhole aperture and c ounts for different intrinsic resolution

    d(mm)

    R

    rg

    c/mCi/s

    tot.out

    xkddetetargriricRgc/mCi/sbdRrgric/mCi/s

    1.40.30.36300.50.140.050.50.0000394417.320.30.50.50.14944

    1.40.30.36300.50.270.110.510.0000394417.320.30.510.50.27944

    1.40.30.36300.50.410.160.530.0000394417.320.30.530.50.41944

    1.40.30.36300.50.540.220.540.0000394417.320.30.540.50.54944

    1.40.30.36300.50.680.270.570.0000394417.320.30.570.50.68944

    1.40.40.46300.640.140.050.640.00004155417.320.40.640.640.141554

    1.40.40.46300.640.270.110.650.00004155417.320.40.650.640.271554

    1.40.40.46300.640.410.160.660.00004155417.320.40.660.640.411554

    1.40.40.46300.640.540.220.680.00004155417.320.40.680.640.541554

    1.40.40.46300.640.680.270.70.00004155417.320.40.70.640.681554

    1.40.50.56300.780.140.050.780.00007231317.320.50.780.780.142313

    1.40.50.56300.780.270.110.790.00007231317.320.50.790.780.272313

    1.40.50.56300.780.410.160.80.00007231317.320.50.80.780.412313

    1.40.50.56300.780.540.220.810.00007231317.320.50.810.780.542313

    1.40.50.56300.780.680.270.830.00007231317.320.50.830.780.682313

    1.40.60.66300.920.140.050.920.00009322017.320.60.920.920.143220

    1.40.60.66300.920.270.110.930.00009322017.320.60.930.920.273220

    1.40.60.66300.920.410.160.940.00009322017.320.60.940.920.413220

    1.40.60.66300.920.540.220.950.00009322017.320.60.950.920.543220

    1.40.60.66300.920.680.270.960.00009322017.320.60.960.920.683220

    1.40.70.76301.060.140.051.070.00012427617.320.71.071.060.144276

    1.40.70.76301.060.270.111.070.00012427617.320.71.071.060.274276

    1.40.70.76301.060.410.161.080.00012427617.320.71.081.060.414276

    1.40.70.76301.060.540.221.090.00012427617.320.71.091.060.544276

    1.40.70.76301.060.680.271.10.00012427617.320.71.11.060.684276

    1.40.80.86301.20.140.051.210.00015547917.320.81.211.20.145479

    1.40.80.86301.20.270.111.210.00015547917.320.81.211.20.275479

    1.40.80.86301.20.410.161.220.00015547917.320.81.221.20.415479

    1.40.80.86301.20.540.221.220.00015547917.320.81.221.20.545479

    1.40.80.86301.20.680.271.230.00015547917.320.81.231.20.685479

    1.40.90.96301.340.140.051.350.00019683017.320.91.351.340.146830

    1.40.90.96301.340.270.111.350.00019683017.320.91.351.340.276830

    1.40.90.96301.340.410.161.350.00019683017.320.91.351.340.416830

    1.40.90.96301.340.540.221.360.00019683017.320.91.361.340.546830

    1.40.90.96301.340.680.271.370.00019683017.320.91.371.340.686830

    1.411.06301.480.140.051.490.00023833017.3211.491.480.148330

    1.411.06301.480.270.111.490.00023833017.3211.491.480.278330

    1.411.06301.480.410.161.490.00023833017.3211.491.480.418330

    1.411.06301.480.540.221.50.00023833017.3211.51.480.548330

    1.411.06301.480.680.271.510.00023833017.3211.511.480.688330

    1.41.11.16301.620.140.051.630.00028997817.321.11.631.620.149978

    1.41.11.16301.620.270.111.630.00028997817.321.11.631.620.279978

    1.41.11.16301.620.410.161.630.00028997817.321.11.631.620.419978

    1.41.11.16301.620.540.221.640.00028997817.321.11.641.620.549978

    1.41.11.16301.620.680.271.650.00028997817.321.11.651.620.689978

    tot.out

    counts(c/mCi/s)

    R(mm)

    Resolution vs pinhole aperture and c ounts for different intrinsic resolution

    d(mm)

    R

    rg

    c/mCi/s

    Chart1

    0.432831

    0.432831

    0.442831

    0.442831

    0.452831

    0.554663

    0.554663

    0.564663

    0.564663

    0.574663

    0.676940

    0.676940

    0.686940

    0.686940

    0.686940

    0.799661

    0.799661

    0.89661

    0.89661

    0.89661

    0.9112826

    0.9112826

    0.9212826

    0.9212826

    0.9212826

    1.0316436

    1.0316436

    1.0416436

    1.0416436

    1.0416436

    1.1520491

    1.1520491

    1.1620491

    1.1620491

    1.1620491

    1.2724989

    1.2724989

    1.2824989

    1.2824989

    1.2824989

    1.3929932

    1.3929932

    1.429932

    1.429932

    1.429932

    R

    c/mCi/s

    tot.out

    xkddetetargriricRgc/mCi/sbdRc/mCi/s

    1.20.30.36450.430.140.030.430.00008283117.320.30.432831

    1.20.30.36450.430.270.050.430.00008283117.320.30.432831

    1.20.30.36450.430.410.080.440.00008283117.320.30.442831

    1.20.30.36450.430.540.110.440.00008283117.320.30.442831

    1.20.30.36450.430.680.140.450.00008283117.320.30.452831

    1.20.40.46450.550.140.030.550.00013466317.320.40.554663

    1.20.40.46450.550.270.050.550.00013466317.320.40.554663

    1.20.40.46450.550.410.080.560.00013466317.320.40.564663

    1.20.40.46450.550.540.110.560.00013466317.320.40.564663

    1.20.40.46450.550.680.140.570.00013466317.320.40.574663

    1.20.50.56450.670.140.030.670.0002694017.320.50.676940

    1.20.50.56450.670.270.050.670.0002694017.320.50.676940

    1.20.50.56450.670.410.080.680.0002694017.320.50.686940

    1.20.50.56450.670.540.110.680.0002694017.320.50.686940

    1.20.50.56450.670.680.140.680.0002694017.320.50.686940

    1.20.60.66450.790.140.030.790.00027966117.320.60.799661

    1.20.60.66450.790.270.050.790.00027966117.320.60.799661

    1.20.60.66450.790.410.080.80.00027966117.320.60.89661

    1.20.60.66450.790.540.110.80.00027966117.320.60.89661

    1.20.60.66450.790.680.140.80.00027966117.320.60.89661

    1.20.70.76450.910.140.030.910.000361282617.320.70.9112826

    1.20.70.76450.910.270.050.910.000361282617.320.70.9112826

    1.20.70.76450.910.410.080.920.000361282617.320.70.9212826

    1.20.70.76450.910.540.110.920.000361282617.320.70.9212826

    1.20.70.76450.910.680.140.920.000361282617.320.70.9212826

    1.20.80.86451.030.140.031.030.000461643617.320.81.0316436

    1.20.80.86451.030.270.051.030.000461643617.320.81.0316436

    1.20.80.86451.030.410.081.040.000461643617.320.81.0416436

    1.20.80.86451.030.540.111.040.000461643617.320.81.0416436

    1.20.80.86451.030.680.141.040.000461643617.320.81.0416436

    1.20.90.96451.150.140.031.150.000582049117.320.91.1520491

    1.20.90.96451.150.270.051.150.000582049117.320.91.1520491

    1.20.90.96451.150.410.081.160.000582049117.320.91.1620491

    1.20.90.96451.150.540.111.160.000582049117.320.91.1620491

    1.20.90.96451.150.680.141.160.000582049117.320.91.1620491

    1.211.06451.270.140.031.270.00072498917.3211.2724989

    1.211.06451.270.270.051.270.00072498917.3211.2724989

    1.211.06451.270.410.081.280.00072498917.3211.2824989

    1.211.06451.270.540.111.280.00072498917.3211.2824989

    1.211.06451.270.680.141.280.00072498917.3211.2824989

    1.21.11.16451.390.140.031.390.000842993217.321.11.3929932

    1.21.11.16451.390.270.051.390.000842993217.321.11.3929932

    1.21.11.16451.390.410.081.40.000842993217.321.11.429932

    1.21.11.16451.390.540.111.40.000842993217.321.11.429932

    1.21.11.16451.390.680.141.40.000842993217.321.11.429932

    tot.out

    R

    c/mCi/s

    Chart1

    0.3911322

    0.3911322

    0.3911322

    0.411322

    0.411322

    0.518652

    0.518652

    0.5118652

    0.5118652

    0.5118652

    0.6127758

    0.6227758

    0.6227758

    0.6227758

    0.6227758

    0.7338643

    0.7338643

    0.7338643

    0.7338643

    0.7338643

    0.8451305

    0.8451305

    0.8451305

    0.8451305

    0.8451305

    0.9565745

    0.9565745

    0.9565745

    0.9565745

    0.9565745

    1.0681962

    1.0681962

    1.0681962

    1.0681962

    1.0681962

    1.1799957

    1.1799957

    1.1799957

    1.1799957

    1.1799957

    1.28119730

    1.28119730

    1.28119730

    1.28119730

    1.28119730

    R

    c/mCi/s

    tot.out

    xkddetetargririRgc/mCi/sbdRc/mCi/s

    1.10.30.36300.40.140.010.390.000321132250.30.3911322

    1.10.30.36300.40.270.030.390.000321132250.30.3911322

    1.10.30.36300.40.410.040.390.000321132250.30.3911322

    1.10.30.36300.40.540.050.40.000321132250.30.411322

    1.10.30.36300.40.680.070.40.000321132250.30.411322

    1.10.40.46300.510.140.010.50.000521865250.40.518652

    1.10.40.46300.510.270.030.50.000521865250.40.518652

    1.10.40.46300.510.410.040.510.000521865250.40.5118652

    1.10.40.46300.510.540.050.510.000521865250.40.5118652

    1.10.40.46300.510.680.070.510.000521865250.40.5118652

    1.10.50.56300.620.140.010.610.000782775850.50.6127758

    1.10.50.56300.620.270.030.620.000782775850.50.6227758

    1.10.50.56300.620.410.040.620.000782775850.50.6227758

    1.10.50.56300.620.540.050.620.000782775850.50.6227758

    1.10.50.56300.620.680.070.620.000782775850.50.6227758

    1.10.60.66300.740.140.010.730.001093864350.60.7338643

    1.10.60.66300.740.270.030.730.001093864350.60.7338643

    1.10.60.66300.740.410.040.730.001093864350.60.7338643

    1.10.60.66300.740.540.050.730.001093864350.60.7338643

    1.10.60.66300.740.680.070.730.001093864350.60.7338643

    1.10.70.76300.850.140.010.840.001445130550.70.8451305

    1.10.70.76300.850.270.030.840.001445130550.70.8451305

    1.10.70.76300.850.410.040.840.001445130550.70.8451305

    1.10.70.76300.850.540.050.840.001445130550.70.8451305

    1.10.70.76300.850.680.070.840.001445130550.70.8451305

    1.10.80.86300.960.140.010.950.001856574550.80.9565745

    1.10.80.86300.960.270.030.950.001856574550.80.9565745

    1.10.80.86300.960.410.040.950.001856574550.80.9565745

    1.10.80.86300.960.540.050.950.001856574550.80.9565745

    1.10.80.86300.960.680.070.950.001856574550.80.9565745

    1.10.90.96301.070.140.011.060.002318196250.91.0681962

    1.10.90.96301.070.270.031.060.002318196250.91.0681962

    1.10.90.96301.070.410.041.060.002318196250.91.0681962

    1.10.90.96301.070.540.051.060.002318196250.91.0681962

    1.10.90.96301.070.680.071.060.002318196250.91.0681962

    1.111.06301.180.140.011.170.0028199957511.1799957

    1.111.06301.180.270.031.170.0028199957511.1799957

    1.111.06301.180.410.041.170.0028199957511.1799957

    1.111.06301.180.540.051.170.0028199957511.1799957

    1.111.06301.180.680.071.170.0028199957511.1799957

    1.11.11.16301.290.140.011.280.0033711973051.11.28119730

    1.11.11.16301.290.270.031.280.0033711973051.11.28119730

    1.11.11.16301.290.410.041.280.0033711973051.11.28119730

    1.11.11.16301.290.540.051.280.0033711973051.11.28119730

    1.11.11.16301.290.680.071.280.0033711973051.11.28119730

    tot.out

    R

    c/mCi/s

  • Scintillator arrays

  • .pinhole collimator

    .array od pixellated scintillator (NaI(Tl))(1.25x1.25x5 mm3) and (1.8 x1.8 x6 mm3)

    . PSPMT (R2486 (3) (Hamamatsu) Understanding limitations - spatial resolution- sensitivity what can be improved ? intrinsic detector performances FOV sensitivitystarting pointNot independentsimple desktop detector

  • H8500 6 mm H9500 3 mm

  • Comparison pin-hole parallel hole collimator 140 keV high resolution parallel hole collimator 57Co source 1 mm diameter at 5 mm distance - Parallel hole : ~ 15.9 counts/mCixs - Pinhole : ~ 3 counts/mCixs (1mm aperture)NaI(Tl), 1.8 x 1.8 mm pixel sizeFWHM = 1.7 mmI = 3 FWHM= 2.8 mm pin hole collimator only a factor ~ 5 efficiency

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    spot-3inch-nai2mm-17mmdist

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  • Source diameter: ~ 1.0 mmNaI(Tl), 1.8 x 1.8x 5 mm3d = 7 mm (I=~7)d= 17 mm (I=3)FWHM = 1.7 mmFWHM = 1.3 mm NaI(Tl), 1.25x1.25x 5 mm3 I = 7FWHM = 1.3 mm Resolution doesnt improve, pixels identification not so good --> photodetector limitationFWHM = 1.1 mmPinhole aperture: 0.67 mmPinhole aperture : 1mm

    Chart1

    40

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    87

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    3600

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    75

    mm

    spot-3inch-nai2mm-17mmdist

    10646941681681081841131461521168355500000000

    00296379885665545769846090823000

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    0246810121416182022242628303234

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    Chart3

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    spot-3inch-nai2mm-17mmdist

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    Chart4

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    506

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    67

    mm

    spot-3inch-nai2mm-17mmdist

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    mm

    spot-3inch-nai2mm-7mmdist

    24681012141617.62022242628303234

    34102030355610024048039225315690604030

    spot-3inch-nai2mm-7mmdist

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    Sheet4

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  • NaI(Tl), 1.25 mm pixel size, M16Source diameter: ~ 1.0 mm, I ~ 7NaI(Tl), 1.8 mm pixel size, M161.1 mm FWHMNaI(Tl), 1.8 mm pixel size, M64NaI(Tl), 1.25 mm pixel size, M64Lets improve the pixel identification (better sampling at anode level (M16 (4 x 4 mm2 and M64 (2x2 mm2))1.0 mm FWHM1.0 mm FWHM1.1 mm FWHM

    Chart8

    8

    90

    462

    1348

    2130

    3000

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    2670

    1905

    1359

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    mm

    spot-3inch-nai2mm-17mmdist

    10646941681681081841131461521168355500000000

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    spot-3inch-nai2mm-17mmdist

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    spot-3inch-nai2mm-7mmdist

    24681012141617.62022242628303234

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    spot-3inch-nai2mm-7mmdist

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    spot-m16-nai1.4mm

    0.01.42.84.25.67.08.49.811.212.614.015.416.818.2

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    spot-m16-nai1.4mm

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    spot-m16-nai2mm

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    9600

    21500

    26426

    11800

    1306

    516

    400

    mm

    spot-3inch-nai2mm-17mmdist

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    mm

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    spot-3inch-nai2mm-7mmdist

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    2066

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    6900

    3460

    1600

    112

    60

    40

    mm

    spot-3inch-nai2mm-17mmdist

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  • CsI(Tl) arrays Hamamatsu PSPMTs C8,M16,M64 (different anode)4.2x4.2 mm21.5x1.5 mm22.5x2.5 mm2 C8M16M64

  • Improving sampling -> better pixel identification(more pixel in the image)R2486, 1.8 mm pixelR2486, 1.2 mm pixelM16, 1.8 mm pixelM16, 1.2 mm pixelM64, 1.8 mm pixelM64, 1.25 mm pixel

  • - pin hole aperture dominates the spatial resolution

    - apertures = 0.5 mm (or 0.3 mm) would improve spatial resolution but lowering counting rates M16 and M64 have small area (~20 x 20 mm2) arrays possible solution but dead area --> not the best

    H8500 (50 x 50 mm2, 64 channels (anode sampling 6 x 6 mm2)

    - H9500 (50 x 50 mm2, 256 channels (anode sampling 3x3 mm2) availablesmall anode pixel ->better sampling ->better performances

  • Pinhole aperture

    (mm)

    Spatial resolution (mm)

    Magnification

    Peak/valley

    R2486 NaI 1.8 mm

    1

    1.2

    7

    1.4

    R2486 NaI 1.8 mm

    1

    1.3

    3

    1.4

    R2486 NaI 1.25 mm

    1

    1.2

    7

    0.7

    R2486 NaI 1.8 mm

    0.67

    0.8

    7

    1.4

    H8500, NaI 1.8 mm

    (6 x 6 mm2 anode pixel)

    0.67

    0.7

    7

    11

    H8500, NaI 1.25 mm

    (6 x 6 mm2 anode pixel)

    0.67

    0.8

    4

    11

    M16 NaI 1.8 mm

    (4 x 4 mm2 anode pixel)

    1

    1.1

    7

    13

    M16 NaI 1.25 mm

    (4x 4 mm2 anode pixel)

    1

    1.1

    7

    11

    H9500, NaI 1.25 mm

    (3x3 mm2 anode pixel)

    M64 NaI 1.8 mm

    (2 x 2mm2 anode pixel)

    1

    1.1

    7

    15

    M64 NaI 1.25 mm

    (2x 2 mm2 anode pixel)

    1

    1.0

    7

    17

    R2486 NaI 1.8 mm,

    High resolution,

    parallel hole

    1.2

    (hole

    dimension)

    2.0

    1

    1.4

  • catene resistive vs multiwire

    Grafico2

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    0

    0

    0

    0

    0

    0

    2

    1

    1

    3

    13

    36

    121

    192

    308

    312

    260

    116

    67

    31

    43

    78

    161

    272

    282

    174

    139

    66

    42

    55

    106

    231

    324

    278

    133

    97

    200

    288

    350

    220

    117

    70

    129

    225

    340

    296

    143

    72

    47

    42

    78

    176

    294

    297

    212

    98

    56

    79

    172

    304

    351

    262

    131

    83

    145

    271

    337

    265

    133

    54

    50

    49

    131

    211

    287

    271

    165

    85

    45

    23

    49

    62

    160

    251

    299

    262

    136

    80

    79

    166

    327

    379

    260

    143

    101

    233

    328

    281

    173

    83

    49

    60

    135

    250

    336

    257

    162

    61

    27

    36

    73

    149

    312

    347

    235

    101

    69

    114

    236

    385

    352

    157

    65

    91

    159

    273

    352

    295

    167

    58

    22

    4

    5

    1

    0

    0

    0

    1

    0

    0

    0

    0

    0

    0

    0

    0

    0

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    0

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    0

    0

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    0

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    0

    0

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    0

    0

    image pixel

    counts

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    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

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    0

    0

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    0

    0

    0

    0

    0

    2

    1

    1

    3

    13

    36

    121

    192

    308

    312

    260

    116

    67

    31

    43

    78

    161

    272

    282

    174

    139

    66

    42

    55

    106

    231

    324

    278

    133

    97

    200

    288

    350

    220

    117

    70

    129

    225

    340

    296

    143

    72

    47

    42

    78

    176

    294

    297

    212

    98

    56

    79

    172

    304

    351

    262

    131

    83

    145

    271

    337

    265

    133

    54

    50

    49

    131

    211

    287

    271

    165

    85

    45

    23

    49

    62

    160

    251

    299

    262

    136

    80

    79

    166

    327

    379

    260

    143

    101

    233

    328

    281

    173

    83

    49

    60

    135

    250

    336

    257

    162

    61

    27

    36

    73

    149

    312

    347

    235

    101

    69

    114

    236

    385

    352

    157

    65

    91

    159

    273

    352

    295

    167

    58

    22

    4

    5

    1

    0

    0

    0

    1

    0

    0

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    0

    0

    0

    0

    0

    0

    0

    0

    0

    Grafico1

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

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    0

    0

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    0

    0

    0

    0

    0

    0

    0

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    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    1

    1

    2

    2

    4

    10

    19

    34

    53

    77

    89

    82

    66

    49

    42

    36

    41

    52

    60

    66

    62

    55

    41

    34

    30

    33

    37

    48

    57

    62

    56

    46

    37

    29

    22

    20

    27

    45

    58

    67

    57

    46

    35

    29

    31

    35

    51

    60

    70

    74

    69

    53

    35

    33

    38

    53

    64

    67

    58

    48

    41

    35

    31

    35

    48

    63

    66

    56

    42

    34

    30

    31

    37

    48

    62

    65

    64

    53

    41

    31

    31

    35

    46

    53

    57

    57

    42

    44

    36

    41

    31

    37

    48

    61

    61

    59

    48

    41

    30

    26

    27

    35

    47

    56

    58

    57

    45

    34

    27

    30

    39

    53

    59

    65

    55

    47

    38

    33

    37

    42

    48

    62

    69

    66

    47

    30

    27

    37

    53

    71

    75

    66

    52

    36

    29

    28

    43

    58

    68

    66

    59

    44

    29

    22

    23

    31

    40

    56

    69

    79

    75

    69

    52

    40

    22

    12

    4

    2

    1

    1

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

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    0

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    0

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    0

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    0

    0

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    0

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    0

    0

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    0

    0

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    0

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    0

    0

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    0

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    0

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    0

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    0

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    0

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    Peak

    Valley

    image pixel

    counts

    trunc_9_ori

    0

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    0

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    0

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    0

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    0

    0

    0

    0

    0

    0

    0

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    0

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    0

    0

    0

    0

    0

    0

    0

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    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    1

    1

    2

    2

    4

    10

    19

    34

    53

    77

    89

    82

    66

    49

    42

    36

    41

    52

    60

    66

    62

    55

    41

    34

    30

    33

    37

    48

    57

    62

    56

    46

    37

    29

    22

    20

    27

    45

    58

    67

    57

    46

    35

    29

    31

    35

    51

    60

    70

    74

    69

    53

    35

    33

    38

    53

    64

    67

    58

    48

    41

    35

    31

    35

    48

    63

    66

    56

    42

    34

    30

    31

    37

    48

    62

    65

    64

    53

    41

    31

    31

    35

    46

    53

    57

    57

    42

    44

    36

    41

    31

    37

    48

    61

    61

    59

    48

    41

    30

    26

    27

    35

    47

    56

    58

    57

    45

    34

    27

    30

    39

    53

    59

    65

    55

    47

    38

    33

    37

    42

    48

    62

    69

    66

    47

    30

    27

    37

    53

    71

    75

    66

    52

    36

    29

    28

    43

    58

    68

    66

    59

    44

    29

    22

    23

    31

    40

    56

    69

    79

    75

    69

    52

    40

    22

    12

    4

    2

    1

    1

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    Table 2:

    Scintillator

    Pixel size

    (mm2)

    Spatial resolution

    (mm)

    Valley/peak ratio

    R2486

    H8500

    R2486

    H8500

    CsI(Tl)

    1 x 1

    0.90 ( 0.09

    0.62 ( 0.06

    0.80 ( 0.06

    0.580 ( 0.008

    CsI(Tl)

    1.4 x 1.4

    1.27 ( 0.11

    0.80 ( 0.07

    0.46 ( 0.04

    0.14 ( 0.03

    CsI(Tl)

    2 x 2

    1.09 ( 0.09

    0.63 ( 0.06

    0.31 ( 0.03

    0.051 ( 0.009

    CsI(Tl)

    3 x 3

    1.53 ( 0.13

    0.86 ( 0.07

    0.068 ( 0.007

    0.032 ( 0.005

    NaI(Tl)

    1.8 x 1.8

    1.00 ( 0.08

    1.16 ( 0.09

    0.10 ( 0.01

    0.15 ( 0.03

  • - fixing FOV according to the particular research- fixing the area (50 x 50 mm2 to 100 x 100 mm2) seems to best solution ---> FOV = ~ 15 x 15 mm2 to 50 x 50 mm2 (according to the detector area and magnification)- maximizing the number of pixel - trying to improve sensitivity- reading out all the channelsTo be done

  • NaI 1.8 x 1.8 mm2 *(and 1.25 x 1.25 mm2)-H8500 64 channels(6x6 mm2 anode pixel)Improving detector peformances (more pixel, better indentification, improved spatial resolution) NaI 1.25 x 1.25 mm2 H9500 256 channels (3x3 mm2 anode pixel) Next step: smaller scintillator pixel size? CsI (Tl) (or Na? ) or NaI(Tl)Improving the efficiency - bigger detector area- better collimation (coded aperture)How Pin hole (tungsten) collimator (0.3,0.5,0.7,1) mm better photodetector

  • New Detector (Pin hole 0.7 mm tungsten, H8500 64 ch) (1.8 x 1.8 mm2) (1.25 x 1.25 mm2)

    Good pixel identification For 1.8 x 1.8 not so good for 1.25 x 1. 25-> better anode sampling is needed --> H8500 256 channelsFlood Field irradiationEg = 122 keV

  • Read-out electronics

  • High resolution preserving high SNR ?coded apertures

  • Coded aperturesI (Image) = O (object) x A (aperture)There are decoding patterns G allowing: A G = d thenA G = , in fact = R G = ( O A ) G = O * (A G) = O * PSFExample of apertures with known decoding patternFigure adapted from:Fenimore and Cannon, Optical Engineering, 19, 3, 283-289, 1980.

  • 10Ci in 10 s

    4444 pixels

    1.25 x 1.25 mm2

    FoV 22cm2.Mask NTHT MURA 2222, =2, 1% transparent, thickness 1.5mm W. Pitch 0.68mm.Line source10Ci in 10 s

    2D source10Ci in 10 s

    simulation for our desktop detectorsensitivity improved by a factor 30!coded aperture collimators

  • Reconstruction of a 122 keV point-like source using the coded apertures FWHM=0.93 mmSensitivity=145 cps /MBq 5 cps/MBq with pinholeSubmillimeter spatial resolutionHigh sensitivity (factor ~ 30)

  • Image of a mouse headTop view of a mouse injected with 3 mCi of 99Tc-MDP (image time 25 min; FOV = 16 x16 mm2)

  • ConclusioniCosa occorreScintillatore(i) pixellato, fototubo(i), DAQ veloce per ~ 1000 ch, collimatori pinhole e/o aperture codificate Come PercheRilevanza Imaging funzionale, mediante radionuclidi ad alta risoluzione ed efficienza, signle photon (planare e tomografico)