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A finished prototype is expected by December 2007. According to the researchers, the machine will improve the accuracy of radiation treatments for solid tumors, thereby reducing side effects. In addition, it could improve treatment for lung and prostate cancers where it is still difficult to administer sufficient radiation doses to obtain a better chance of a cure. (Tuesday, July 24, 10 AM, Paper TU-C-M100F-1)


V. A SOLID STATE X-RAY IMAGE INTENSIFIER

A solid-state x-ray image intensifier (SSXII), now in development, should greatly improve the spatial resolution of medical x-ray imaging. In angiography (imaging blood vessels using higher x-ray exposures to provide a very high-quality, low-noise diagnostic image) and fluoroscopy (real-time imaging at lower x-ray exposures for image guidance) it is important to minimize the x-ray dose to the patient and to maximize the sensitivity of the detectors recording the image. Usually an x-ray image intensifier (XII) or a flat-panel detector (FPD) is employed. These are devices used for converting the x-ray image into a digital image. The XII suffers from inherent image distortions due to the method of image intensification including susceptibility to the earths magnetic field. As a result, the XII is currently being replaced by the newer FPDs which overcome these distortion problems. Unfortunately the flat-panel detectors themselves suffer from excessive instrumentation noise, resulting in poor image quality at the lower x-ray exposures required for fluoroscopy. Both detectors have limited spatial resolution.

Now, scientists at the University at Buffalo are developing a solid state version of the traditional x-ray image intensifier, one which relies upon electron-multiplying charge-coupled devices (CCDs) to provide variable signal amplification in solid-state. The result should be a device which incorporates all the positive features of current state-of-the-art f
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Contact: Ben Stein
bstein@aip.org
301-209-3091
American Institute of Physics
10-Jul-2007


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