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2/14/2019
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
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Nuclear Medicine Artifacts
SCPMG Medical Imaging Technology & Informatics
Medical Physics Group
Brian Helbig, MS, DABR
Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group2
Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Symmetric energy windows
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2/14/2019
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Dynamic clinical study – Energy peak shift – Electrical grounding problem
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Asymmetric window
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Symmetric/Asymmetric energy windows - Poor PMT balance and crystal hydration
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2/14/2019
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Asymmetric energy window – fault in energy correction map
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Asymmetric energy window – clinical example with I-123 and Tc-99m
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Clinical example - Tl-201 uniformity - Defective linearity correction
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Uniformity – Ga-67 – Separate and sum of energy windows
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Image without linearity or energy corrections
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Side-by-side comparison with and without uniformity corrections
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Fault energy correction map – Clinical study
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Loss of hermetic seal/optical coupling
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Cracked crystal – Puncture/impact
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group16
Cracked crystal – Puncture/impact
Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Cracked crystal - Thermal
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Crystal hydration
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Crystal Irregularities
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Uniformity – Defective PM Tube
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Uniformity – Defective PM tube (newer digital camera)
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Defective PMT at FoV edge
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Clinical bone scan – defective PM tube
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Maladjusted PM tube
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Unacceptable extrinsic floods – Low energy collimator misalignment
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http://www.nuclearfields.com/images/photo-microlinear2.gif
Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Unacceptable extrinsic floods – Low energy collimator angulation
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Unacceptable extrinsic flood – Collimator septa damage - Puncture
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Clinical example – Collimator star pattern
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Fillable flood source - Air bubble
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Fillable flood source - Non-uniform mixing
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Fillable flood source – bulging sides
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Fillable flood source – Adherence of activity to the container at the filling site (algae)
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Non-Uniformity in Cobalt Sheet Source
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Point Source Geometry and multihead systems
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
NEMA slit pattern – Unacceptable difference in x and y spatial resolution
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Intrinsic spatial resolution - Faulty linearity correction
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Extrinsic Spatial Resolution - Moiré pattern
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Uniformity and High Count Rates
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Poor spatial resolution at high count rates due to misplaced events
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
SPECT Uniformity – simulation with no noise – Effect of projection sampling
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Comparison of high and low count densities
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Single head SPECT uniformity – Ring artifact from real data
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Dual head SPECT – Clinical partial ring artifact
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
SPECT non-uniformity from high temperature
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
SPECT non-uniformity from outdated uniformity corrections
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Myocardial Perfusion SPECT – With and without uniformity defect
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Center of Rotation (COR) Offset
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Clinical SPECT brain perfusion – Effect of COR offset
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Effect of detector head tilt - Myocardial perfusion study
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Effects of color table – Myocardial perfusion
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Whole body Scan – Faulty PM tube old linearity and energy corrections
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Whole body scan – Co57 versus Tc-99m energy window
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Whole Body Scan – Contamination on handkerchief
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Gated SPECT acquisition – Problems due to heart arrhythmia
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
System uniformity – Contaminated collimator
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Positron range and image quality
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
PET detector failure
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Controller board failure
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Faulty timing calibration
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Memory board failure
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group61
Normalization
Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Faulty normalization
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Scatter correction artifact
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Scatter correction artifact
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Intravenous contrast artifact
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Intravenous contrast artifacts
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Breathing motion artifact
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Subcutaneous tracer infiltration
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Contamination at injection site
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Contamination during flushing
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Contamination post injection
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Data entry errors and SUV analysis
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Insufficient Bed Overlap
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Medical Imaging T echnology & Informatics (MIT I)
Southern Cali f o rnia Permanente Medical Group
Thank you for your attention!
INTERNATIONAL ATOMIC ENERGY AGENCY, PET/CT Atlas on Quality Control and Image Artefacts, IAEA Human Health Series No. 27, IAEA, Vienna (2014).
INTERNATIONAL ATOMIC ENERGY AGENCY, IAEA Quality Control Atlas for Scintillation Camera Systems, IAEA, Vienna (2003).
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References