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An intra-operative positron probe with background rejection capability for FDG-guided surgery
Seiichi Yamamoto1, Keiichi Matsumoto, Setsu Sakamoto
1Department of Electrical Engineering, Kobe City College of Technology, Japan. s-yama@kobe-kosen.ac.jp
Annals of Nuclear Medicine
|March 18, 2005
Summary
A new intra-operative positron probe effectively rejects background radiation during tumor surgery using F-18-FDG. This innovation improves detection accuracy by selectively identifying positron signals amidst high gamma photon flux.
Area of Science:
- Medical Physics
- Nuclear Medicine
- Surgical Instrumentation
Background:
- Radio-guided surgery using F-18-FDG faces limitations due to background radiation from annihilation photons.
- High background counts reduce the clinical utility of current detection methods.
Purpose of the Study:
- To develop an intra-operative positron probe with enhanced background-rejection capabilities.
- To improve the accuracy and effectiveness of radio-guided tumor surgery.
Main Methods:
- Utilized a phoswich detector comprising a plastic scintillator and bismuth germinate (BGO).
- Employed decay time differences between scintillators to distinguish true positron events from background events.
- Configured the probe for selective positron detection in high gamma photon flux environments.
Main Results:
- Achieved a spatial resolution of 11-mm FWHM at 5 mm from the detector surface.
- Measured a sensitivity of 2.6 cps/kBq for an F-18 point source at 5 mm.
- Demonstrated a low background count rate (<0.5 cps) and linear positron count rate up to approximately 6 kcps.
Conclusions:
- The developed intra-operative positron probe is effective in rejecting background radiation.
- This technology offers significant value for F-18-FDG guided tumor surgery in challenging clinical settings.