Prevalence and Severity of Off-Centering During Diagnostic CT: Observations From 57,621 CT scans of the Chest, Abdomen, and/or Pelvis

Oladunni O. Akin-Akintayo, Lauren F. Alexander, Rebecca Neill, Elizabeth A. Krupinksi, Xiangyang Tang, Pardeep Kumar Mittal, William C. Small, Courtney C. Moreno

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)229-234
Number of pages6
JournalCurrent Problems in Diagnostic Radiology
Volume48
Issue number3
DOIs
StatePublished - May 1 2019

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Pelvis
Abdomen
Thorax
Analysis of Variance
Water

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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Prevalence and Severity of Off-Centering During Diagnostic CT : Observations From 57,621 CT scans of the Chest, Abdomen, and/or Pelvis. / Akin-Akintayo, Oladunni O.; Alexander, Lauren F.; Neill, Rebecca; Krupinksi, Elizabeth A.; Tang, Xiangyang; Mittal, Pardeep Kumar; Small, William C.; Moreno, Courtney C.

In: Current Problems in Diagnostic Radiology, Vol. 48, No. 3, 01.05.2019, p. 229-234.

Research output: Contribution to journalArticle

Akin-Akintayo, Oladunni O. ; Alexander, Lauren F. ; Neill, Rebecca ; Krupinksi, Elizabeth A. ; Tang, Xiangyang ; Mittal, Pardeep Kumar ; Small, William C. ; Moreno, Courtney C. / Prevalence and Severity of Off-Centering During Diagnostic CT : Observations From 57,621 CT scans of the Chest, Abdomen, and/or Pelvis. In: Current Problems in Diagnostic Radiology. 2019 ; Vol. 48, No. 3. pp. 229-234.
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abstract = "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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