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Performance evaluation of the positron scanner ECAT EXACT.
K Wienhard1, L Eriksson, S Grootoonk
1Max-Planck-Institut für neurologische Forschung, Köln, Germany.
Journal of Computer Assisted Tomography
|September 1, 1992
Summary
The Cologne Special, a prototype PET scanner, offers high sensitivity and excellent spatial resolution for brain, heart, and whole-body imaging. Its design ensures versatile applications without compromising performance.
Area of Science:
- Medical Imaging
- Nuclear Medicine
- Instrumentation
Background:
- The ECAT EXACT (model 921) represents a new generation of Siemens-CTI PET scanners.
- The Cologne Special is a prototype designed to evaluate this advanced technology.
Purpose of the Study:
- To characterize the performance of the Cologne Special prototype PET scanner.
- To assess its suitability for various clinical applications.
Main Methods:
- The prototype features three rings of 48 BGO block detectors, providing 47 image planes in 2D mode.
- System sensitivity, spatial resolution, and count rate performance were measured using phantoms.
- Scatter characteristics were evaluated under different septa configurations and energy thresholds.
Main Results:
- High system sensitivity achieved: 216 kcps/microCi/ml (2D) and 1.5 Mcps/microCi/ml (3D).
- Excellent transaxial spatial resolution (<6 mm FWHM at center) and axial resolution (5.0 mm FWHM at center).
- Linear count rate performance up to 2.5 microCi/ml and versatile imaging capabilities demonstrated in brain, heart, and whole-body studies.
Conclusions:
- The Cologne Special prototype demonstrates robust physical performance.
- Its design and capabilities support a wide range of PET imaging applications.