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Development of a thick CdTe detector for BNCT-SPECT.

I Murata¹, T Mukai, S Nakamura

¹Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan. murata@eei.eng.osaka-u.ac.jp

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|May 21, 2011

Summary

Researchers developed a real-time Boron Neutron Capture Therapy (BNCT) monitoring system using single-photon emission computed tomography (SPECT). This system aims to precisely measure treatment effects during therapy, improving patient outcomes.

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Area of Science:

Medical Physics
Nuclear Medicine
Oncology

Background:

Boron Neutron Capture Therapy (BNCT) treatment effects are difficult to ascertain in real-time due to flexible irradiation times.
Current methods fix irradiation time beforehand and adjust stopping time during treatment, limiting precise monitoring.

Purpose of the Study:

To develop a single-photon emission computed tomography (SPECT) system for real-time monitoring of BNCT treatment effects.
To achieve simultaneous high detection efficiency and acceptable spatial resolution for BNCT monitoring.

Main Methods:

Utilized a Cadmium Telluride (CdTe) detector with a side surface (1x2 mm²) as the radiation entrance window.
Employed a Schottky type detector to enhance energy resolution for gamma-ray discrimination.

Main Results:

Achieved acceptable spatial resolution and high detection efficiency using the CdTe detector.
Demonstrated the potential to acquire sufficient counts for 478 keV gamma-rays within approximately 30 minutes.
Successfully discriminated between 478 keV gamma-rays and annihilation gamma-rays due to improved energy resolution.

Conclusions:

The developed BNCT-SPECT system shows promise for real-time monitoring of treatment effects.
Future development includes an array-type detector for enhanced system performance in BNCT applications.