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28 May 1999 Evaluation of a CMOS image detector for low-cost and power medical x-ray imaging applications
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Recent developments in CMOS image detectors are changing the way digital imaging is performed for many applications. The replacement of charge coupled devices (CCDs), with CMOS detectors is a desirable paradigm shift that will depend on the ability to match the high performance characteristics of CCDs. Digital X-ray imaging applications (chest X-ray, mammography) would benefit greatly from this shift because CMOS detectors have the following inherent characteristics: (1) Low operating power (5 - 10 times lower than CCD/processing electronics). (2) Standard CMOS manufacturing process (CCD requires special manufacturing). (3) On-chip integration of analog/digital processing functions (difficult with CCD). (4) Low Cost (5 - 10 times lower cost than CCD). The achievement of both low cost and low power is highly desirable for portable applications as well as situations where large, expensive X-ray imaging machines are not feasible (small hospitals and clinics, emergency medical vehicles, remote sites). Achieving this goal using commercially available components would allow rapid development of such digital X-ray systems as compared with the development difficulties incurred through specialized direct detectors and systems. The focus of this paper is to evaluate a CMOS image detector for medical X-ray applications and to demonstrate the results obtained from a prototype CMOS digital X-ray camera. Results from the images collected from this optically-coupled camera are presented for a particular lens, X-ray conversion screen, and demagnification factor. Further, an overview of the overall power consumption and cost of a multi-sensor CMOS mosaic compared to its CCD counterpart are also reported.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Scott T. Smith, Daniel R. Bednarek, Darold C. Wobschall, Myoungki Jeong, Hyunkeun Kim, and Stephen Rudin "Evaluation of a CMOS image detector for low-cost and power medical x-ray imaging applications", Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999);


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