Program Information
Basic Study and Improvements of Electron-Tracking Compton Camera for Practical Use
S Kabuki1*, S Fujii2 , T Nagakura3 , J Yamashita4 , J Kushida5 , K Nishijima6 , A Takada7 , T MIzumoto8 , Y Mizumura9 , T Tanimori10 , E Kunieda11 , (1) Tokai University, Isehara-shi, Kanagawa, (2) Tokai University, Hiratsuka-shi, Kanagawa, (3) Tokai University, Hiratsuka-shi, Kanagawa, (4) Tokai University, Isehara-shi, Kanagawa, (5) Tokai University, Hiratsuka-shi, Kanagawa, (6) Tokai University, Hiratsuka-shi, Kanagawa, (7) Kyoto University, Sakyo, Kyoto, (8) Kyoto University, Sakyo, Kyoto, (9) Kyoto University, Sakyo, Kyoto, (10) Kyoto University, Sakyo, Kyoto, (11) Tokai University, Isehara-shi, Kanagawa
Presentations
TU-L-GePD-IT-2 (Tuesday, August 1, 2017) 1:15 PM - 1:45 PM Room: Imaging ePoster Theater
Purpose: In clinical practice, PET and SPECT are the most popular gamma-ray camera in nuclear medicine. However, these cameras have essential problem of the energy limitation. To solve the problem, we have developed the new medical imaging camera called Electron-tracking Compton camera (ETCC). Although some of performance results of ETCC were obtained so far, further improvements are needed to be used clinically. In this study, we show the results of design study using Monte-Carlo simulation(Geant4) and hardware developments for practical use.
Methods: The ETCC consists of two detectors, scatter detector and absorption detector. The scatter detector is gaseous detector, and we can get Compton recoil electron energies and tracks. However, Compton scattered gamma-rays are often scattered again in the vacuum container wall 16.7mm thick. So, we optimized the detector design using the Geant4. Furthermore, we have studied the absorption detector which made of photomultiplier tube (PMT). The PMT is useful but it needs the high voltage and its size is large. A MPPC (multi pixel photon counters) is suitable for ETCC because of its compact and low required voltage. Therefore, we built the absorption detector using four MPPC modules which consists of 3 x 3 mm pixel size and 8 x 8 pixels.
Results: In simulation study, noise which is generated in the container wall was reduced by 33% by reducing the thickness to 1 mm, and both angular resolution and sensitivity are improved. And We also succeeded in data acquisition from the four MPPC modules.
Conclusion: We have developed the ETCC as a new medical imaging device, and succeeded in improving detector performance by MC study and continue the development of absorption detectors using MPCC. When these developments will be finished, we will be able to apply new nuclear medicine detector clinically.
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