Related Experiment Videos
Transmission scanning system for a gamma camera coincidence scanner
C M Laymon1, T G Turkington, D R Gilland
1Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710, USA.
Summary
A new transmission scanning system was developed for dual-head gamma cameras, enabling effective attenuation correction in coincidence imaging. This practical system improves image quality by removing artifacts from patient scans.
Area of Science:
- Nuclear medicine
- Medical imaging physics
Background:
- Attenuation correction is crucial for quantitative accuracy in emission tomography.
- Existing methods for transmission scanning on dual-head gamma cameras can be complex or impractical.
Purpose of the Study:
- To develop and evaluate a practical transmission scanning system for attenuation correction.
- To integrate this system with a dual-head gamma camera coincidence scanner.
Main Methods:
- Utilized point sources of Cesium-137 (137Cs) emitting 662-keV gamma-rays in singles mode.
- Employed a 2D offset fanbeam geometry with septa providing axial collimation.
- Measured camera energy and spatial resolution, system sensitivity, and effects of supplemental collimation.
- Calibrated and tested the system using phantoms and patient data.
Main Results:
- Achieved camera resolution of 11.7% FWHM at postinjection rates and intrinsic spatial resolution of 2.7 mm FWHM.
- System sensitivity was 280 Hz/MBq with supplemental collimation.
- Demonstrated excellent resolution of small phantom structures and artifact-free corrected patient emission scans.
Conclusions:
- Developed an easily implemented transmission scanning system for dual-head gamma camera coincidence scanners.
- The system is suitable for postinjection transmission scanning.
- Successfully corrected patient emission data, removing attenuation-induced artifacts.