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Focal spot, focal object distance and exposure time
Author(s)
Wanluk, Nutthanan
Date Issued
December 19, 2017
Type
Conference Paper
Abstract
X-ray calibration tool for central point, focal-object distance and exposure time is proposed in this paper. To calibrate for central point and focal-object distance, a metal hollow cylindrical phantom is designed. The phantom will be placed in x-ray beam with central point is at the central-ray marker of the x-ray apparatus. The acquire x-ray imaging is then processed with image processing to determine the central point and focal-object distance. To measure an exposure time, a step-down transformer with bridge full-wave rectifier circuit is used to bypass the primary side of high-tension transformer. The signal is then analyzed to count number of full-wave x-ray pulse which can be converted to exposure time.
Citation
Bmeicon 2017 10th Biomedical Engineering International Conference, 2017-January, 1-4, 2017