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DOI: 10.1148/radiol.2262011812
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(Radiology 2003;226:585-592.)
© RSNA, 2003

Technical Developments

Patient-specific Region-of-Interest Fluoroscopy Device for X-ray Dose Reduction1

Tong Xu, PhD, Huy Quang Le, BS and Sabee Molloi, PhD

1 From the Department of Radiological Sciences, University of California, Medical Sciences I, B-140, Irvine, CA 92697. Received November 12, 2001; revision requested January 2, 2002; final revision received May 2; accepted May 22. Supported in part by grant R01 HL57338 awarded by the National Heart, Lung, and Blood Institute and the United States Department of Health and Human Services. Address correspondence to S.M. (e-mail: symolloi@uci.edu).

A region-of-interest (ROI) fluoroscopy device that provides an automatically generated ROI filter with an arbitrary shape, as well as digitally compensated images, was built and evaluated. ROI filters were generated by using a deformable attenuation material. Images were compensated by using a compensation ratio and a running average interpolation method. Image compensation parameters were predicted on the basis of the x-ray tube potential used. The image quality with and without an ROI filter was evaluated. This ROI fluoroscopic technique was shown to substantially reduce patient and operator radiation exposure without degrading image quality within the ROI.

© RSNA, 2003

Index terms: Fluoroscopy, technology • Images, processing • Phantoms • Radiations, exposure to patients and personnel • Radiography, technology • Test objects






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