Presentation Information
[25a-12E-6]Development of High-resolution PET using Depth of Interaction
〇(D)shuwei zhao1, Hiroyuki Takahashi1, Kenji Shimazoe1 (1.The Univ of Tokyo)
Keywords:
double MPPC,double photon imaging,phase shifting
Medical imaging refers to the technology and processing process of obtaining internal tissue images of the human body or a certain part of the human body in a non-invasive manner. Radiation medical imaging is one of the most popular topic in current imaging field, which includes positron emitting tomography(PET), single photon emission computed tomography and so on. For PET imaging, it only detects annihilationgamma rays released in opposite directions, which means we can only detect one line ratherthan the precise location of radiation sources. For SPECT, the direction of incident gamma-rays is limited by mechanical collimators. For double photon imaging, cascade gamma rays are released in various directions, creating the opportunity for us to find the intersection point for two gamma rays. Collimator imaging method can provide a detailed position and fine resolution. For the collimation design, The radionuclideposition can be specified at the intersection point of two lines if we use two parallel holes; For parallel hole and slit hole collimators.
Theradionuclide position can be identified at the intersection point of a plane and a line. We need a high resolution gamma-ray imaging system to take advantage of this imaging method.Present detector system is based on an individual readout system using a 3 mm pitch MPPC array, which restricts the spatial resolution of the imaging system. In order to reduce the pixel size of MPPC virtually, we propose a double side readout system with phase shifting. We move the mppc along the x side and y side by half pixel every time. In this case, one MPPC pixel becomes 4 four
scintillator pixels for high-resolution double-sided readout. For the readout system, we plan to use dynamic TOT and try to optimize the Dynamic TOT at the same time.
Theradionuclide position can be identified at the intersection point of a plane and a line. We need a high resolution gamma-ray imaging system to take advantage of this imaging method.Present detector system is based on an individual readout system using a 3 mm pitch MPPC array, which restricts the spatial resolution of the imaging system. In order to reduce the pixel size of MPPC virtually, we propose a double side readout system with phase shifting. We move the mppc along the x side and y side by half pixel every time. In this case, one MPPC pixel becomes 4 four
scintillator pixels for high-resolution double-sided readout. For the readout system, we plan to use dynamic TOT and try to optimize the Dynamic TOT at the same time.