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Improving Compton imaging of 478 keV prompt gamma-ray in boron neutron capture therapy with neural network-based event filtering: a simulation study.

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Study on measuring device arrangement of array-type CdTe detector for BNCT-SPECT.

Masanobu Manabe1, Soichiro Nakamura1, Isao Murata1

  • 1Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Yamada-oka 2-1, Suita, Osaka 565-0871, Japan.

Reports of Practical Oncology and Radiotherapy : Journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology
|March 3, 2016
PubMed
Summary

Designing a cadmium telluride (CdTe) detector array for Boron Neutron Capture Therapy-Single Photon Emission Computed Tomography (BNCT-SPECT) is crucial. Anti-coincidence measurements show promise for improving signal-to-noise ratios in real-time treatment monitoring.

Keywords:
Anti-coincidenceBNCTCdTe detectorCollimatorGamma-raySPECT

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Area of Science:

  • Medical Physics
  • Nuclear Medicine
  • Materials Science

Background:

  • Boron Neutron Capture Therapy (BNCT) lacks real-time treatment effect monitoring.
  • Current BNCT-SPECT development faces challenges in spatial resolution, speed, accuracy, and energy resolution.

Purpose of the Study:

  • To design an effective measuring device arrangement for an array-type CdTe detector system for BNCT-SPECT.
  • To address the limitations hindering practical application of BNCT-SPECT.

Main Methods:

  • Numerical simulations using the MCNP5 transport code were employed.
  • The simulations considered the detector assembly, irradiation room, and arrayed CdTe crystal configuration.

Main Results:

  • Sufficient count rates for 478 keV gamma-rays were estimated, exceeding the target.
  • Signal-to-noise (S/N) ratios did not meet the target due to Compton scattering, particularly from hydrogen capture gamma-rays.
  • Anti-Compton measurement feasibility was investigated to mitigate noise.

Conclusions:

  • Theoretical calculations suggest anti-coincidence measurements could enhance the S/N ratio.
  • Future work involves constructing a two-crystal CdTe detector array to experimentally validate anti-coincident event removal.