Cross Talk Experiment with Two-element CdTe Detector and Collimator for BNCT-SPECT

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 7Li nucleus created by 10B(n,α) 7Li 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.

[1]  F. Sato,et al.  Basic detection property of an array-type CdTe detector for BNCT-SPECT - Measurement and analysis of anti-coincidence events. , 2016, Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine.

[2]  I. Murata,et al.  Study on measuring device arrangement of array-type CdTe detector for BNCT-SPECT. , 2016, Reports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology.

[3]  K. Ogawa,et al.  Feasibility study on pinhole camera system for online dosimetry in boron neutron capture therapy. , 2014, Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine.

[4]  I. Murata,et al.  Development of a thick CdTe detector for BNCT-SPECT. , 2011, Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine.

[5]  S. Green,et al.  Experimental feasibility studies on a SPECT tomograph for BNCT dosimetry. , 2009, Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine.

[6]  P. Rosenschöld,et al.  Prompt gamma tomography during BNCT – a feasibility study , 2006 .

[7]  Y. Sakurai,et al.  A noninvasive dose estimation system for clinical BNCT based on PG-SPECT--conceptual study and fundamental experiments using HPGe and CdTe semiconductor detectors. , 2000, Medical physics.