J Cardiovasc Imaging.  2020 Jan;28(1):21-32. 10.4250/jcvi.2019.0066.

Simultaneous Assessment of Left Ventricular Function and Coronary Artery Anatomy by Third-generation Dual-source Computed Tomography Using a Low Radiation Dose

Affiliations
  • 1Department of Radiology, Pusan National University School of Medicine and Medical Research Institute, Pusan National University Hospital, Busan, Korea.
  • 2Department of Radiology, Pusan National University School of Medicine and Medical Research Institute, Pusan National University Yangsan Hospital, Yangsan, Korea. kschoo0618@naver.com
  • 3Department of Cardiology, Kim Hae Kangil Hospital, Gimhae, Korea.

Abstract

BACKGROUND
To assess left ventricular function and coronary artery simultaneously by third-generation dual-source computed tomography (CT) using a low radiation dose.
METHODS
A total of 48 patients (36 men, 12 women; mean age 57.0 ± 9.5 years) who underwent both electrocardiography-gated cardiac CT angiography (CCTA) using 70-90 kVp and echocardiography were included in this retrospective study. The correlation between left ventricular end-diastolic volume (LVEDV), left ventricular end-systolic volume (LVESV), and left ventricular ejection fraction (LVEF) measured using CCTA and echocardiography was determined. The quality of coronary artery images was analyzed using a 4-point scale (1, excellent; 4, poor). The effective radiation dose of CCTA was calculated.
RESULTS
Mean heart rate during the CT examination was 59.9 ± 9.9 bpm (range 38-79) and the body mass index of 48 patients was 24.5 ± 2.6 kg/m² (range 17.0-29.4). LVEDV, LVESV, and LVEF measured using CCTA and echocardiography demonstrated a fair to moderate correlation (Pearson correlation coefficient: r = 0.395, p = 0.005 for LVEDV; r = 0.509. p < 0.001 for LVESV; r = 0.551, p < 0.001 for LVEF). Average image quality score of coronary arteries was 1.0 ± 0.1 (range 1-2). A total of 99.0% (783 of 791) of segments had an excellent image quality score, and 1.0% (8 of 791) of segments had a good score. Mean effective radiation dose was 2.2 ± 0.7 mSv.
CONCLUSIONS
Third-generation dual-source CT using a low tube voltage simultaneously provides information regarding LV function and coronary artery disease at a low radiation dose. It can serve as an alternative option for functional assessment, particularly when other imaging modalities are inadequate.

Keyword

Multidetector computed tomography; Echocardiography; Left ventricular function; Coronary vessels; Radiation dosage

MeSH Terms

Angiography
Body Mass Index
Coronary Artery Disease
Coronary Vessels*
Echocardiography
Female
Heart Rate
Humans
Male
Multidetector Computed Tomography
Radiation Dosage
Retrospective Studies
Stroke Volume
Ventricular Function, Left*
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