Dual energy radiography using active detector technology

J Anthony Seibert, T. F. Poage, R. E. Alvarez

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


A new technology has been implemented using an `active-detector' comprised of two computed radiography (CR) imaging plates in a sandwich geometry for dual-energy radiography. This detector allows excellent energy separation, short exposure time, and high signal to noise ratio (SNR) for clinically robust `bone-only' and `soft-tissue only' images with minimum patient motion. Energy separation is achieved by two separate exposures at widely different kVp's: the high energy (120 kVp+1.5 mm Cu filter) exposure is initiated first, followed by a short burst of intense light to erase the latent image on the front plate, and then a 50 kVp (low energy) exposure. A personal computer interfaced to the x-ray generator, filter wheel, and active detector system orchestrates the acquisition sequence within a time period of 150 msec. The front and back plates are processed using a CR readout algorithm with fixed speed and wide dynamic range. `Bone-only' and `soft-tissue only' images are calculated by geometric alignment of the two images and application of dual energy decomposition algorithms on a pixel by pixel basis. Resultant images of a calibration phantom demonstrate an increase of SNR2/ dose by approximately 73 times when compared to a single exposure `passive-detector' comprised of CR imaging plates, and an approximately 8 fold increase compared to a screen-film dual-energy cassette comprised of different phosphor compounds. In conclusion, dual energy imaging with `active detector' technology is clinically feasible and can provide substantial improvements over conventional methods for dual-energy radiography.

Original languageEnglish (US)
Title of host publicationIEEE Nuclear Science Symposium & Medical Imaging Conference
Place of PublicationPiscataway, NJ, United States
Number of pages4
StatePublished - 1996
EventProceedings of the 1996 IEEE Nuclear Science Symposium. Part 1 (of 3) - Anaheim, CA, USA
Duration: Nov 2 1996Nov 9 1996


OtherProceedings of the 1996 IEEE Nuclear Science Symposium. Part 1 (of 3)
CityAnaheim, CA, USA

ASJC Scopus subject areas

  • Engineering(all)


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