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Analyses and applications of single scan dose profiles in computed tomography
Author(s) -
Tsai H. Y.,
Tung C. J.,
Huang M. H.,
Wan Y. L.
Publication year - 2003
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1590315
Subject(s) - dosimetry , dosimeter , nuclear medicine , ionization chamber , pencil (optics) , monte carlo method , computed tomography , dose profile , thermoluminescence , thermoluminescent dosimeter , tomography , materials science , medicine , physics , optics , radiology , irradiation , ionization , mathematics , nuclear physics , ion , statistics , quantum mechanics
Comprehensive analyses and measurements of computed tomography (CT) single‐scan dose profiles were performed for several scanners and operating conditions. Measurements were made using two types of thermoluminescent dosimeters, LiF:Mg,Cu,P and CaSO 4 : Dy , and two CT dosimetry phantoms, head and body. Analyses of CT single‐scan dose profiles were made in terms of a Gaussian function for primary radiation and a Lorentzian function for scattered radiation. This function was used to investigate several common descriptions of the CT dose, including the computed tomography dose index (CTDI) and the multiple scan average dose. The relative percentage of scatter versus primary radiation to the contribution of CTDI at the central and peripheral locations was determined and analyzed. The correlation between CTDI of thermoluminescent dosimeter measurements and pencil‐shaped ionization chamber measurements was determined. A method for estimating organ dose from CT was developed and compared to organ‐dose estimates from Monte Carlo simulations.