Overview

Research Goals The objective of this group is to improve instrumentation for nuclear medical imaging. Most of our efforts concentrate on advanced detector concepts for imaging positron-labeled tracers, but we are also seeking to image single-photon emitting tracers and x-rays.

The most commonly utilized techniques for detecting ionizing radiation (which includes positrons, gamma rays, and x-rays) involve scintillators, which are materials that convert ionizing radiation into a brief flash of light. Therefore, we are involved in developing new scintillators and performing fundamental studies of scintillation mechanisms. We also are developing new methods that use the light from the scintillators to accurately measure the position and energy of the ionizing radiation. This includes development of new silicon photodiode arrays (devices that convert the scintillation light into minute electrical signals) and custom integrated circuits (to amplify these minute signals). Finally, we are designing and constructing several complete imaging systems based on these core technologies. These systems have geometries optimized for imaging either brain disease or breast cancer. Technology transfer of these techniques and devices to other research institutions and industry will permit the production of improved nuclear medical imaging instrumentation for the benefit of medical research throughout the world.

Woon-Seng Choong
Last modified: Fri Jun 15 15:14:23 PDT 2001