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Proceedings Paper

Back-illuminated photodiodes for multislice CT
Author(s): Randy P. Luhta; Rodney A. Mattson; Narayan Taneja; Peter Bui; Roar Vasbo
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Paper Abstract

Conventional 2D photodiodes used in multislice CT detectors impose a limitation on the number of slices that can be achieved. The limitations encountered are in the number of metal lines that can be run between photodiode elements without significantly reducing the photodiode active area and in the density of wirebonds that can be accomodated at the edge of the chip. In addition, the photodiodes cannot easily be tiled in two directions due to the need for wirebonding on at least one edge. We have developed a 2D back illuminated photodiode array for multislice CT that overcomes the above limitations. The light sensitivity, sensitivity profiles, risetime, crosstalk, linearity and shunt resistance of the back illuminated photodiodes have been evaluated. The results show that these parameters either meet or exceed the specifications required for CT. The back illuminated photodiode represents an enabling technology for truly large area CT detection systems.

Paper Details

Date Published: 5 June 2003
PDF: 11 pages
Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); doi: 10.1117/12.480242
Show Author Affiliations
Randy P. Luhta, Philips Medical Systems (United States)
Rodney A. Mattson, Philips Medical Systems (United States)
Narayan Taneja, UDT Sensors, Inc. (United States)
Peter Bui, UDT Sensors, Inc. (United States)
Roar Vasbo, AME as (Norway)


Published in SPIE Proceedings Vol. 5030:
Medical Imaging 2003: Physics of Medical Imaging
Martin J. Yaffe; Larry E. Antonuk, Editor(s)

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