Accession Number : ADA260236


Title :   A Multi-Mode X-Ray Imaging System with One-Sided CT Capability


Descriptive Note : Final rept. 15 Aug 1988-15 Feb 1989


Corporate Author : RAYEX CORP GAITHERSBURG MD


Personal Author(s) : Motz, J W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a260236.pdf


Report Date : 20 Feb 1990


Pagination or Media Count : 39


Abstract : The goal of this project is to develop an X-ray imaging system with three operating modes, including (1) a CT Mode with an open one-sided geometry providing complete or partial CT type image slices with arbitrary orientations and shapes, (2) a Transmission Mode providing conventional transmission images, and (3) a Fluoroscopy Mode providing real-time images. Because this Versatile, open system offers immediate access to wounded soldiers with one third the weight and cost of conventional CT systems, it is especially suitable for combat casualty care. This Phase I program was carded out with a simplified one-sided CT system which can provide tomographic images with X-rays backscattered from different body volume elements penetrated by the X-ray beam. The X-ray image sensor consists of an array of low efficiency plastic scintillation detectors which select and count the scattered X-rays providing the image signal. With spatial resolution indicators used as test objects, the X-ray exposures and the digital outputs of the X-ray detectors were measured to determine the signal- tonoise ratios, the spatial resolutions, and the minimum required X-ray exposures. The results show that with the use of high efficiency detectors, this one-sided CT system is capable of obtaining spatial resolutions from 2 to 5 Line Pairs per cm with an average patient dose per slice of less than 2 rads per image slice, or a spatial resolution greater than 7 Line Pairs per cm with an average patient dose of 5 rads per slice, which is the dose requirements for present CT systems. ....Tomography, Backscattered x-rays, Multi-mode, One-sided CT, X-ray slot camera, Digital radiography, RAD II, SBIR.


Descriptors :   *X RAYS , *IMAGES , *TOMOGRAPHY , *FLUOROSCOPY , TEST AND EVALUATION , OUTPUT , REQUIREMENTS , RATIOS , VOLUME , WARFARE , DETECTORS , TIME , PATIENTS , CASUALTIES , TRANSMITTERS , ACCESS , SLOTS , CAMERAS , WEIGHT , SIGNALS , COSTS , SCINTILLATION , RADIOGRAPHY , BODIES , INDICATORS , PHASE , REAL TIME , ARMY PERSONNEL , RESOLUTION , SHAPE , ARRAYS , EFFICIENCY


Subject Categories : Medicine and Medical Research
      Electrical and Electronic Equipment
      Nuclear Physics & Elementary Particle Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE