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KMID : 0364920160410040328
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Journal of Radiation Protection and Research
2016 Volume.41 No. 4 p.328 ~ p.332
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Cross Talk Experiment with Two-element CdTe Detector and Collimator for BNCT-SPECT
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Manabe Masanobu
Ohya Ryosuke
Saraue Nobuhide
Sato Fuminobu
Murata Isao
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Abstract
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Background: Boron Neutron Capture Therapy (BNCT) is a new radiation therapy. In BNCT, there exists some very critical problems that should be solved. One of the severest problems is that the treatment effect cannot be known during BNCT in real time. We are now developing a SPECT (single photon emission computed tomography) system (BNCT-SPECT), with a cadmium telluride (CdTe) semiconductor detector. BNCT-SPECT can obtain the BNCT treatment effect by measuring 478 keV gamma-rays emitted from the excited state of 7 Li nucleus created by 10B(n,α) 7 Li reaction. In the previous studies, we investigated the feasibility of the BNCTSPECT system. As a result, the S/N ratio did not meet the criterion of S/N > 1 because deterioration of the S/N ratio occurred caused by the influence of Compton scattering especially due to
capture gamma-rays of hydrogen.
Materials and Methods: We thus produced an arrayed detector with two CdTe crystals to test cross talk phenomenon and to examine an anti-coincidence detection possibility. For more precise analysis for the anti-coincidence detection, we designed and made a collimator having a similar performance to the real BNCT-SPECT.
Results and Discussion: We carried out experiments with the collimator to examine the effect of cross talk of scattering gamma-rays between CdTe elements more practically. As a result of measurement the coincidence events were successfully extracted.
Conclusion: We are now planning to carry out evaluation of coincidence rate from the measurement and comparison of it with the numerical calculations.
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KEYWORD
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BNCT, SPECT, CdTe detector, Gamma-ray, Coincidence detection
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