Feb 21 – 25, 2022
Vienna University of Technology
Europe/Vienna timezone

Performance demonstration of multi-modal imaging using hybrid Compton cameras

Not scheduled
20m
Vienna University of Technology

Vienna University of Technology

Gusshausstraße 27-29, 1040 Wien
Recorded Presentation Medical Applications

Speaker

Mr Akihisa Omata (Waseda University)

Description

X-ray and gamma-ray imaging techniques are crucial in various fields. In the field of nuclear medicine, single-photon emission tomography (SPECT) and positron emission tomography (PET) scans are the two most commonly used techniques; however, both techniques only image a specific energy range of either X-rays or gamma rays. SPECT can only image gamma rays with energies less than 300 keV using a collimator, whereas PET can image only 511 keV gamma rays from positron emitters. Compton cameras have attracted attention because of their capability of imaging above 1 MeV.
We propose a hybrid Compton camera (HCC) that realizes simultaneous Compton and pinhole imaging within a single detector system. Similar to conventional Compton cameras, the HCC consists of two layers of scintillator arrays. The front detector acts as a scatterer for high-energy photons (>200 keV) and an active pinhole for low-energy photons (<200 keV). Furthermore, we developed a system consisting of multiple HCCs to simultaneously realize three modalities: Compton, pinhole, and PET imaging. We successfully performed the simultaneous imaging of Cs-137 (Compton mode; 662 keV), Na-22 (PET mode; 511 keV), and Am-241 (pinhole mode; 60 keV) within the same field of view. Further, the 3D distribution of an At-211 tracer inside a mouse was imaged. We also investigated the effectiveness of implementing BGO active shields to enhance the imaging performance. Our study introduces a new imaging modality in nuclear medicine.

Primary authors

Mr Akihisa Omata (Waseda University) Ms Miho Masubuchi (Waseda University) Ms Nanase Koshikawa (Waseda University) Prof. Jun Kataoka (Waseda University) Prof. Hiroki Kato (Osaka University) Prof. Atsushi Toyoshima (Osaka University) Prof. Takahiro Teramoto (Osaka University) Prof. Kazuhiro Ooe (Osaka University) Ms Yuwei Liu (Osaka University) Prof. Keiko Matsunaga (Osaka University) Prof. Takashi Kamiya (Osaka University) Prof. Tadashi Watabe (Osaka University) Prof. Eku Shimosegawa (Osaka University) Prof. Jun Hatazawa (Osaka University)

Presentation materials