Single-tube miniature gamma camera
In certain medical gamma imaging applications, conventional cameras are too large for practical use. To address these situations, we have constructed a clinically usable miniature gamma camera for photon energies up to 160 keV. The camera has outer dimensions of 92 mm × 92 mm × 190 mm and weighs 5 kg. Included in that mass is a collimator, an internal high-voltage power supply, and all shielding. The camera also has a position-sensitive photomultiplier tube (PSPMT) coupled to an 8-mm thick NaI(Tl) crystal; this crystal/tube combination provides signals to internal processing circuits. External electronics and analog-to-digital conversion circuits are connected to a Macintosh Quadra computer where additional processing, storage, and display of the signals takes place. Because the PSPMT has non-uniform energy response that results in geometric distortion if conventional position-arithmetic calculations are used, we have implemented a maximum-likelihood position-estimation calculation that produces undistorted images. The present version of the camera has a usable field of view of 48 mm × 48 mm and an intrinsic spatial resolution of 2.4 to 3.8 mm full width at half maximum.
Publication Source (Journal or Book title)
IEEE Nuclear Science Symposium & Medical Imaging Conference
Yasillo, N., Mintzer, R., Aarsvold, J., Matthews, K., Heimsath, S., Ordonez, C., Pan, X., Wu, C., Block, T., Beck, R., Chen, C., & Cooper, M. (1994). Single-tube miniature gamma camera. IEEE Nuclear Science Symposium & Medical Imaging Conference (pt 2), 1073-1076. Retrieved from https://digitalcommons.lsu.edu/physics_astronomy_pubs/3403