A comparative study of the dose distribution for three-phase and single-phase x-ray equipment Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3j333625j

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  • There has been a large increase in the number of three-phase diagnostic x-ray systems installed in hospital special-procedure rooms during the last decade. The reason for this is the capability of three-phase systems of making possible the very short exposure times and increased tube loading required for some of the recently developed radiological procedures. Analysis of the voltage waveforms indicates that x-ray beams produced by three-phase systems have a higher effective energy and a higher exposure rate than those produced by single-phase equipment operated at the same kilovoltage and tube current. This study compares dose distributions for single- and three-phase x-ray systems operated under conditions similar to those used in medical radiography. Depth-dose data were taken using thermoluminescent dosimeters in a tissue equivalent (Mix D) phantom at 40, 60, 80, 100, 125, and 150 kVp. Measurements were made at 1 cm intervals from the incident phantom surface to a depth of 13 cm, and at 2 cm intervals from 13 to 25 cm. The source to phantom surface distance was 30 inches. Curves of equivalent kilovoltage, which would provide approximately the same radiographic results, were derived for single- and three-phase systems. The data were normalized for equal exposures for various phantom thicknesses related to the energy used, and dose differentials were determined for both equal and equivalent kilovoltages.
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