Performance improvement of Compton imaging of astatine-211 by optimising coincidence time windows. (22nd December 2021)

• Record Type: Journal Article
• Authors: Nagao, Y.; Yamaguchi, M.; Watanabe, S.; Ishioka, N.S.; Kawachi, N.; Watabe, H.
• Is Part Of: Journal of instrumentation. Volume 16:Number 12(2021)
• Publication Date: 2021-12-22
• Subjects: Compton imaging -- Instrument optimisation; Scientific apparatus and instruments -- Periodicals; 502.84
• DOI: 10.1088/1748-0221/16/12/C12031
• Languages: English
• ISSNs: 1748-0221

Abstract

Abstract: Astatine-211 is one of the promising radioisotopes for targeted alpha therapy. Optimising treatment strategies as well as determining the suitability of a given agent for a particular patient requires to image the time-dependent distribution of the targeted radiotherapeutic agent both in tumours and in normal tissues. Since the biodistribution of astatine is different from that of iodine, imaging astatine-211 directly is essential. In the previous study of astatine-211 Compton imaging, random coincidence events due to polonium K-shell X-rays were dominant and seemed to cause saturation of counts. Thus optimisation of the coincidence time windows is important to reduce random coincidence events. In this study, we have optimised the coincidence time windows of a Compton camera and improved the sensitivity, noise and spatial resolution of astatine-211 imaging.