TY - JOUR
T1 - Increased Computed Tomography Dose Due to Miscentering With Use of Automated Tube Voltage Selection
T2 - Phantom and Patient Study
AU - Filev, Peter D.
AU - Mittal, Pardeep Kumar
AU - Tang, Xiangyang
AU - Duong, Phuong Anh
AU - Wang, Xiaojing
AU - Small, William C.
AU - Applegate, Kimberly
AU - Moreno, Courtney C.
N1 - Publisher Copyright:
© 2016 Elsevier Inc.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2016/7/1
Y1 - 2016/7/1
N2 - The purpose of the article is to determine if miscentering affected dose with use of automated tube voltage selection software. An anthropomorphic phantom was imaged at different table heights (centered in the computed tomography [CT] gantry, and -6, -3, +3, and +5.7 cm relative to the centered position). Topogram magnification, tube voltage selection, and dose were assessed. Effect of table height on dose also was assessed retrospectively in human subjects (n = 50). When the CT table was positioned closer to the x-ray source, subjects appeared up to 33% magnified in topogram images. When subjects appeared magnified in topogram images, automated software selected higher tube potentials and tube currents that were based on the magnified size of the subject rather than the subject[U+05F3]s true size. Table height strongly correlated with CT dose index (r = 0.98, P < 0.05) and dose length product (r = 0.98, P < 0.05) in the phantom study. Transverse dimension in the topogram highly correlated with dose in human subjects (r = 0.75-0.87, P <0.05). Miscentering results in increased dose due to topogram magnification with automated voltage selection software.
AB - The purpose of the article is to determine if miscentering affected dose with use of automated tube voltage selection software. An anthropomorphic phantom was imaged at different table heights (centered in the computed tomography [CT] gantry, and -6, -3, +3, and +5.7 cm relative to the centered position). Topogram magnification, tube voltage selection, and dose were assessed. Effect of table height on dose also was assessed retrospectively in human subjects (n = 50). When the CT table was positioned closer to the x-ray source, subjects appeared up to 33% magnified in topogram images. When subjects appeared magnified in topogram images, automated software selected higher tube potentials and tube currents that were based on the magnified size of the subject rather than the subject[U+05F3]s true size. Table height strongly correlated with CT dose index (r = 0.98, P < 0.05) and dose length product (r = 0.98, P < 0.05) in the phantom study. Transverse dimension in the topogram highly correlated with dose in human subjects (r = 0.75-0.87, P <0.05). Miscentering results in increased dose due to topogram magnification with automated voltage selection software.
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U2 - 10.1067/j.cpradiol.2015.11.003
DO - 10.1067/j.cpradiol.2015.11.003
M3 - Review article
C2 - 26810714
AN - SCOPUS:84955252067
SN - 0363-0188
VL - 45
SP - 265
EP - 270
JO - Current Problems in Diagnostic Radiology
JF - Current Problems in Diagnostic Radiology
IS - 4
M1 - 412
ER -