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Proceedings Paper

Novel direct digital modular x-ray device and system
Author(s): Konstantinos E. Spartiotis; Risto Orava; Tom Schulman; Jouni Pyyhtia; Militiadis E. Sarakinos; Bal Sanghera; Agamemnon Epenetos; Ilkka Sunni; Jaakko Salonen; Leif Gronberg; Paivi Majander; David J. Allison; Melvyn Myers
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Paper Abstract

We present an update on a novel direct digital X-ray imaging device and system. The system comprises a mosaic of hybrid solid state semiconductor devices removably mount onto a master plane covering an imaging surface of any desirable shape and size. Each imaging device comprises a pixel semiconductor detector flip-chip joined to a CMOS ASIC. Monolithic CdZnTe and Si pixel detectors with dimensions 12.2 X 4.2 mm2 and 18.9 X 9.6 mm2 have been implemented with a pixel pitch of 35 micrometer. Each circuit on the ASIC, corresponding to a detector pixel, is capable of accumulating thousands of X-rays in the diagnostic energy spectrum with high efficiency (CdZnTe) and user accumulation times ranging from just a few ms to a few s. Individual, removable tiles are combined in a mosaic providing continuous large area imaging with no inactive regions. This tiling approach allows for cost efficient replacement of defective tiles. The packaging delivers a compact, lightweight, portable cassette whose thickness is around 2.0 cm. The basic hybrid detector design and tiling scheme are generic and may be used in mammography, conventional radiography and fluoroscopy. A special tiling scheme has been designed for use in intraoral imaging. We present our measured Modulation Transfer Function (MTF) and Detective Quantum Efficiency (DQE). Images taken with hard objects, phantoms and soft tissue further demonstrate system functionality and provide a comparison with radiographic film and CR plates. The first application of the new technology is intended for the field of dental imaging, mammographic biopsy and other small area medical applications (approximately 10 - 30 cm2 imaging area) as well as Small Area Non Destructive Testing.

Paper Details

Date Published: 24 July 1998
PDF: 8 pages
Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); doi: 10.1117/12.317055
Show Author Affiliations
Konstantinos E. Spartiotis, Simage Oy (Finland)
Risto Orava, Univ. of Helsinki (Finland)
Tom Schulman, Simage Oy (Finland)
Jouni Pyyhtia, Simage Oy (Finland)
Militiadis E. Sarakinos, Univ. of Helsinki (Switzerland)
Bal Sanghera, Simage Oy (United Kingdom)
Agamemnon Epenetos, Simage Oy (United Kingdom)
Ilkka Sunni, VTT (Finland)
Jaakko Salonen, VTT (Finland)
Leif Gronberg, VTT (Finland)
Paivi Majander, VTT (Finland)
David J. Allison, Hammersmith Hospital (United Kingdom)
Melvyn Myers, Hammersmith Hospital (United Kingdom)


Published in SPIE Proceedings Vol. 3336:
Medical Imaging 1998: Physics of Medical Imaging
James T. Dobbins; John M. Boone, Editor(s)

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