imaging molecolare ad alta risoluzione spaziale ed alta efficienza f. garibaldi 09-02-04 - cv infn
DESCRIPTION
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 PresentationTRANSCRIPT
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Imaging molecolare ad alta risoluzione spaziale ed alta efficienzaF. Garibaldi 09-02-04 - CV INFN- perche- come cosa occorre richiesta
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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
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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
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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
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000
000
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000
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000
000
000
000
000
000
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
Chart1
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10465
26634
7700
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309
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5130
7676
3600
1800
1040
355
118
84
75
mm
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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
60
87
86
121
160
309
1826
5130
7676
3600
1800
1040
355
118
84
75
mm
spot-3inch-nai2mm-17mmdist
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Chart3
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4
10
20
30
35
86
220
371
480
392
253
156
90
60
40
30
mm
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Chart4
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82
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90
249
913
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mm
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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
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3529
3779
3388
2670
1905
1359
561
137
mm
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mm
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mm
spot-m16-nai1.4mm
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Chart6
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21500
26426
11800
1306
516
400
mm
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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
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31
43
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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
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65
91
159
273
352
295
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58
22
4
5
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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
0
Peak
Valley
image pixel
counts
trunc_9_ori
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
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)