Speaker
Dr
Alla Reznik
(Sunnybrook&Women’s College Health Sciences Centre)
Description
The design and proof-of-principle results for an MRI-compatible detector module for
PET are reported. The proposed detector has a finely pixelated Cerium-doped
Lutetium Yttrium Orthosilicate (LYSO) array in optical contact with an array of a-
Se avalanche photosensors. The quantum efficiency of the a-Se photosensor was
measured as a function of the wavelength of optical excitation, and is ~95% at the
scintillation peak of LYSO. The gain of the photosensor and the ionization
coefficients of electrons and holes in a-Se were measured as functions of the
electric field induced by a high voltage bias. The photosensor can provide a gain
of 10^3 and has extremely low dark current (< 1 nA). When combined with LYSO, a
crystal with high light yield (~30 photons/keV) and fast scintillation decay (40
ns), it forms a PET module with high detection efficiency. The insensitivity of
the module’s components to magnetic fields makes it a promising candidate for the
development of a PET detector for simultaneous PET/MR imaging. Such a system would
enable visualization of relationships between anatomical structure and function,
thereby greatly aiding the treatment planning and monitoring of many types of
cancer.
Author
Dr
Alla Reznik
(Sunnybrook&Women’s College Health Sciences Centre)
Co-authors
Mr
Brian Lui
(Sunnybrook&Women’s College Health Sciences Centre)
Dr
John Rowlands
(Sunnybrook&Women’s College Health Sciences Centre)
Mr
Kazunori Miyakawa
(NHK Science & Technical Research Laboratories)
Dr
Kenkichi Tanioka
(NHK Science & Technical Research Laboratories)
Mr
Misao Kubota
(NHK Science & Technical Research Laboratories)
Mr
Tomoki Matsubara
(NHK Science & Technical Research Laboratories)
Dr
Toshiaki Kawai
(Hamamatsu Photonics K.K)
Mr
Yuji Ohkawa
(NHK Science & Technical Research Laboratories)
