The effect on dose to computed tomography phantoms of varying the theoretical x-ray spectrum: A comparison of four diagnostic x-ray spectrum calculating codes

Theoretical x-ray spectra calculated by four different codes for the same tube parameters are compared by calculating and measuring doses to computed tomography (CT) body and head phantoms. The effect on the 120 kV spectrum, and hence on the calculated dose, of varying the anode angle, tube voltage,...

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Bibliographic Details
Published in:Medical physics (Lancaster) 1998-06, Vol.25 (6), p.1021-1027
Main Authors: Caon, Martin, Bibbo, Giovanni, Pattison, John, Bhat, Madhava
Format: Article
Language:English
Subjects:
87.53.01
87.56.05
Anodes
Biophysical Phenomena
Biophysics
Computed radiography
Computed tomography
Computer Simulation
computerised tomography
diagnostic x‐ray spectrum
dosimetry
Humans
Monte Carlo Method
Phantoms, Imaging
Physicists
Radiation Dosage
Spectrum Analysis
Technology, Radiologic
theoretical x‐ray spectrum
Tomography, X-Ray Computed - instrumentation
Tomography, X-Ray Computed - methods
Tomography, X-Ray Computed - statistics & numerical data
Tube theories
Vacuum tubes
X-Rays
X‐ray coded apertures
X‐ray effects
X‐ray spectra
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Summary:Theoretical x-ray spectra calculated by four different codes for the same tube parameters are compared by calculating and measuring doses to computed tomography (CT) body and head phantoms. The effect on the 120 kV spectrum, and hence on the calculated dose, of varying the anode angle, tube voltage, and total filtration of the x-ray tube is investigated. Codes used were those of Nowotny and Höfer (XCOMP), Boone, Iles, and Tucker et al. The code based on the work of Tucker et al. produced calculated doses noticeably lower than the other codes and compared best to the measured value. The variation in calculated dose between the Tucker code and the others is of the same order as the variation introduced by uncertainties in total filtration of about 20%, in peak tube voltage of ±4  kV , and in change of anode angle from 7° to 13°.
ISSN:0094-2405
2473-4209
DOI:10.1118/1.598281