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[Quality control in PET/CT systems: experiences and requirements].
Lilli Geworski1, Cornelia Karwarth, Eduard Fitz
1Stabsstelle Strahlenschutz und Medizinische Physik, Medizinische Hochschule Hannover, Hannover. geworski.lilli@mh-hannover.de
Zeitschrift Fur Medizinische Physik
|March 23, 2010
Summary
Routine quality control for PET/CT systems indicates that mechanical adjustments do not require frequent testing. However, enhanced acceptance testing methods are crucial for accurate attenuation correction in PET/CT imaging.
Area of Science:
- Medical Imaging Physics
- Radiological Technology
- Nuclear Medicine Instrumentation
Context:
- Positron Emission Tomography/Computed Tomography (PET/CT) hybrid systems are standard for PET examinations.
- Current regulations cover basic PET and CT modality testing but lack specific guidance for the PET/CT interface.
- The PET/CT interface involves mechanical alignment and CT-based attenuation coefficient energy scaling.
Purpose:
- To evaluate the necessity of routine mechanical offset measurements for PET/CT systems.
- To investigate the impact of patient bed loading and positioning on mechanical alignment.
- To identify needs for improved acceptance testing protocols for PET/CT systems.
Summary:
- Extended weekly mechanical offset measurements on a Siemens Biograph 16 over 10 months, including variations in bed load and position, showed no significant deviations.
- The study concludes that additional routine offset measurements beyond manufacturer recommendations are not necessary for the tested system.
- Energy scaling of attenuation coefficients is method- and software-dependent, precluding its inclusion in routine controls.
Impact:
- Highlights that routine mechanical checks are sufficient for the tested PET/CT system's interface.
- Emphasizes the urgent need for developing robust acceptance testing methods to ensure mechanical accuracy and accurate attenuation correction.
- Aims to improve the reliability and diagnostic accuracy of PET/CT imaging through better quality control standards.
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