A depth-encoding anger detector using scintillating fibers
Document Type
Conference Proceeding
Publication Date
12-1-2000
Abstract
Parallax error during coincidence imaging with dual-head cameras causes infidelity in tomographic images, worsening as one increases crystal thickness to combat poor detection efficiency. We are integrating wavelength-shifting (WLS) scintillating fibers onto a thick NaI(Tl) crystal to create an Anger detector capable of measuring depth-of-interaction (DOI). Our studies target eventual implementation on the large-area detectors of commercial multi-head coincidence imaging systems. The prototype detector uses a 127×127×25.4mm NaI(TI) crystal. The crystal is sealed in a two-windowed aluminum enclosure - both faces of the crystal are coupled optically to glass windows. A ribbon of 125 square 1-mm WLS fibers is coupled lengthwise to the entrance window; enhanced-green-response photomultiplier tubes (PMTs) detect the light from the fibers. The number of fibers exhibiting signals above a threshold value determines the DOI. For interactions near the ribbon, light localizes in only a few fibers: light from distant interactions illuminates many fibers. Four PMTs, for position centroid calculation and energy windowing, are coupled through a light-guide to the exit window of the detector. This paper summarizes the concept of the depth-encoding Anger detector, describes the design of the detector prototype, and details on-going feasibility testing and optimization of the detector.
Publication Source (Journal or Book title)
IEEE Nuclear Science Symposium and Medical Imaging Conference
Recommended Citation
Matthews, K., Leonard, S., Ordoñez, C., Persyk, D., & Chang, W. (2000). A depth-encoding anger detector using scintillating fibers. IEEE Nuclear Science Symposium and Medical Imaging Conference, 2 Retrieved from https://repository.lsu.edu/physics_astronomy_pubs/4278