Coronary computed tomography angiography at 140 kV versus 120 kV

assessment of image quality and radiation exposure in overweight and moderately obese patients

Ashley M. Lee, Leif Christopher Engel, Gladwin C. Hui, Gary Liew, Maros Ferencik, Manavjot S. Sidhu, Udo Hoffmann, Brian B. Ghoshhajra

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Background: Although a tube potential of 140 kV is available on most computed tomography (CT) scanners, its incremental diagnostic value versus 120 kV has been controversial. Purpose: To retrospectively evaluate the image quality and radiation exposure of cardiac computed tomography angiography (CCTA) performed at 140 kV in comparison to CCTA at 120 kV in overweight and moderately obese patients. Material and Methods: Eighty-eight patients who were referred for CCTA between January 2010 and May 2012 were included. Forty-four patients who were overweight or moderately obese (body mass index [BMI], 25-35 kg/m2) underwent CCTA with dual-source CT (DSCT) scanner at 140 kV. Forty-four match controls who underwent CCTA with DSCT at 120 kV were identified per BMI, average heart rate, scan indication, and scan acquisition mode. All scans were performed per routine protocols with direct physician supervision. Quantitative image metrics (CT attenuation, image noise, contrast-to-noise ratio [CNR], and signal-to-noise ratio [SNR] of left main [LM] and proximal right coronary artery [RCA]) were assessed. Effective radiation dose was compared between the two groups. Results: Overall, all scans were diagnostic without any non-evaluable coronary segment per clinical report. 140 kV had a lower attenuation and image noise versus 120 kV (P

Original languageEnglish (US)
Pages (from-to)554-562
Number of pages9
JournalActa Radiologica
Volume55
Issue number5
DOIs
StatePublished - 2014
Externally publishedYes

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X-Ray Computed Tomography Scanners
Body Mass Index
Signal-To-Noise Ratio
Noise
Coronary Vessels
Heart Rate
Tomography
Computed Tomography Angiography
Radiation Exposure
Radiation
Physicians

Keywords

  • Adult
  • Cardiac
  • CT
  • CT angiography
  • Dosimetry
  • Radiation safety

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology
  • Medicine(all)

Cite this

Coronary computed tomography angiography at 140 kV versus 120 kV : assessment of image quality and radiation exposure in overweight and moderately obese patients. / Lee, Ashley M.; Engel, Leif Christopher; Hui, Gladwin C.; Liew, Gary; Ferencik, Maros; Sidhu, Manavjot S.; Hoffmann, Udo; Ghoshhajra, Brian B.

In: Acta Radiologica, Vol. 55, No. 5, 2014, p. 554-562.

Research output: Contribution to journalArticle

Lee, Ashley M. ; Engel, Leif Christopher ; Hui, Gladwin C. ; Liew, Gary ; Ferencik, Maros ; Sidhu, Manavjot S. ; Hoffmann, Udo ; Ghoshhajra, Brian B. / Coronary computed tomography angiography at 140 kV versus 120 kV : assessment of image quality and radiation exposure in overweight and moderately obese patients. In: Acta Radiologica. 2014 ; Vol. 55, No. 5. pp. 554-562.
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