TY - JOUR
T1 - Simultaneous imaging using Si-PM-based PET and MRI for development of an integrated PET/MRI system
AU - Yamamoto, Seiichi
AU - Watabe, Tadashi
AU - Watabe, Hiroshi
AU - Aoki, Masaaki
AU - Sugiyama, Eiji
AU - Imaizumi, Masao
AU - Kanai, Yasukazu
AU - Shimosegawa, Eku
AU - Hatazawa, Jun
PY - 2012/1/21
Y1 - 2012/1/21
N2 - The silicon photomultiplier (Si-PM) is a promising photo-detector for PET for use in magnetic resonance imaging (MRI) systems because it has high gain and is insensitive to static magnetic fields. Recently we developed a Si-PM-based depth-of-interaction PET system for small animals and performed simultaneous measurements by combining the Si-PM-based PET and the 0.15 T permanent MRI to test the interferences between the Si-PM-based PET and an MRI. When the Si-PM was inside the MRI and installed around the radio frequency (RF) coil of the MRI, significant noise from the RF sequence of the MRI was observed in the analog signals of the PET detectors. However, we did not observe any artifacts in the PET images; fluctuation increased in the count rate of the Si-PM-based PET system. On the MRI side, there was significant degradation of the signal-to-noise ratio (S/N) in the MRI images compared with those without PET. By applying noise reduction procedures, the degradation of the S/N was reduced. With this condition, simultaneous measurements of a rat brain using a Si-PM-based PET and an MRI were made with some degradation in the MRI images. We conclude that simultaneous measurements are possible using Si-PM-based PET and MRI.
AB - The silicon photomultiplier (Si-PM) is a promising photo-detector for PET for use in magnetic resonance imaging (MRI) systems because it has high gain and is insensitive to static magnetic fields. Recently we developed a Si-PM-based depth-of-interaction PET system for small animals and performed simultaneous measurements by combining the Si-PM-based PET and the 0.15 T permanent MRI to test the interferences between the Si-PM-based PET and an MRI. When the Si-PM was inside the MRI and installed around the radio frequency (RF) coil of the MRI, significant noise from the RF sequence of the MRI was observed in the analog signals of the PET detectors. However, we did not observe any artifacts in the PET images; fluctuation increased in the count rate of the Si-PM-based PET system. On the MRI side, there was significant degradation of the signal-to-noise ratio (S/N) in the MRI images compared with those without PET. By applying noise reduction procedures, the degradation of the S/N was reduced. With this condition, simultaneous measurements of a rat brain using a Si-PM-based PET and an MRI were made with some degradation in the MRI images. We conclude that simultaneous measurements are possible using Si-PM-based PET and MRI.
UR - http://www.scopus.com/inward/record.url?scp=84855611120&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84855611120&partnerID=8YFLogxK
U2 - 10.1088/0031-9155/57/2/N1
DO - 10.1088/0031-9155/57/2/N1
M3 - Article
C2 - 22170810
AN - SCOPUS:84855611120
SN - 0031-9155
VL - 57
SP - N1-N13
JO - Physics in Medicine and Biology
JF - Physics in Medicine and Biology
IS - 2
ER -