Nuclear probes and intraoperative gamma cameras

Area of Science:

• Medical Physics
• Surgical Oncology
• Radiation Detection

Background:

• Gamma probes are established for cancer management, particularly sentinel lymph node detection.
• Intraoperative beta probes offer potential advantages over gamma probes due to the short range of beta particles, reducing confounding signals.
• Advancements in detector technology have led to the development of both intraoperative beta probes and small field-of-view gamma cameras.

Purpose of the Study:

• To review the development and characteristics of intraoperative radiation probes, including beta and gamma detection systems.
• To compare different detector technologies, such as scintillation and semiconductor detectors, used in these probes.
• To discuss the evolution of intraoperative gamma camera systems, focusing on field-of-view and positioning advancements.

Main Methods:

• Review of scintillation detector materials (e.g., sodium iodide, cesium iodide, lutecium orthooxysilicate, plastic scintillators).
• Review of semiconductor detector materials (e.g., cadmium telluride, cadmium zinc telluride, mercuric iodide).
• Discussion of technological advancements in intraoperative gamma camera systems, including detector arrays and field-of-view expansion.

Main Results:

• Plastic scintillators are well-suited for beta and positron probes due to high beta efficiency and low gamma efficiency.
• Clinical comparisons between scintillation and semiconductor probes have not yielded a definitive preference.
• Early intraoperative gamma cameras had small fields of view and positioning challenges, while newer systems offer larger fields and improved stability.

Conclusions:

• Intraoperative beta probes enhance precision in cancer detection by leveraging the short range of beta particles.
• Both scintillation and semiconductor detectors are utilized in intraoperative probes, with ongoing development in both areas.
• Modern intraoperative gamma cameras provide larger fields of view and better stability, improving surgical field visualization.