TY - JOUR
T1 - Prevalence and Severity of Off-Centering During Diagnostic CT
T2 - Observations From 57,621 CT scans of the Chest, Abdomen, and/or Pelvis
AU - Akin-Akintayo, Oladunni O.
AU - Alexander, Lauren F.
AU - Neill, Rebecca
AU - Krupinksi, Elizabeth A.
AU - Tang, Xiangyang
AU - Mittal, Pardeep Kumar
AU - Small, William C.
AU - Moreno, Courtney C.
N1 - Publisher Copyright:
© 2019 Elsevier Inc.
PY - 2019/5/1
Y1 - 2019/5/1
N2 - Purpose: To determine distances between patient centroid and gantry isocenter during CT imaging of the chest, abdomen, and/or pelvis, and to evaluate differences based on patient gender, scan region, patient position, and gantry aperture. Materials and Methods: A water phantom and an anthropomorphic phantom were imaged in the centered position in the CT gantry and at several off-centered positions. Additionally, data from 57,621 adult chest, abdomen, and/or pelvic CT acquisitions were evaluated. Data were analyzed with an analysis of variance using the centroid-to-isocenter data as the dependent variable and the other parameters as independent variables. Results: The majority of patient acquisitions (83.7% (48271/57621)) were performed with the patient's centroid positioned below isocenter (mean 1.7 cm below isocenter (SD 1.8 cm); range 12.1 cm below to 7.8 cm above isocenter). Off-centering in the x-axis was less severe (mean 0.01 cm left of isocenter (SD 1.6 cm)). Distance between centroid and isocenter in the y-axis did not differ as a function of sex but did differ based on scan region, patient position, and gantry aperture. Conclusion: Off-centering is common during CT imaging and has been previously demonstrated to impact dose and image quality.
AB - Purpose: To determine distances between patient centroid and gantry isocenter during CT imaging of the chest, abdomen, and/or pelvis, and to evaluate differences based on patient gender, scan region, patient position, and gantry aperture. Materials and Methods: A water phantom and an anthropomorphic phantom were imaged in the centered position in the CT gantry and at several off-centered positions. Additionally, data from 57,621 adult chest, abdomen, and/or pelvic CT acquisitions were evaluated. Data were analyzed with an analysis of variance using the centroid-to-isocenter data as the dependent variable and the other parameters as independent variables. Results: The majority of patient acquisitions (83.7% (48271/57621)) were performed with the patient's centroid positioned below isocenter (mean 1.7 cm below isocenter (SD 1.8 cm); range 12.1 cm below to 7.8 cm above isocenter). Off-centering in the x-axis was less severe (mean 0.01 cm left of isocenter (SD 1.6 cm)). Distance between centroid and isocenter in the y-axis did not differ as a function of sex but did differ based on scan region, patient position, and gantry aperture. Conclusion: Off-centering is common during CT imaging and has been previously demonstrated to impact dose and image quality.
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U2 - 10.1067/j.cpradiol.2018.02.007
DO - 10.1067/j.cpradiol.2018.02.007
M3 - Article
C2 - 29576415
AN - SCOPUS:85044295748
SN - 0363-0188
VL - 48
SP - 229
EP - 234
JO - Current Problems in Diagnostic Radiology
JF - Current Problems in Diagnostic Radiology
IS - 3
ER -