Planimetric measurement of the regurgitant orifice area using multidetector CT for aortic regurgitation: A comparison with the use of echocardiography

Min Hee Jeon, Yeon Hyeon Choe, Soo Jin Cho, Seung Woo Park, Pyo Won Park, Jae K. Oh

Research output: Contribution to journalArticle

11 Scopus citations


Objective: This study compared the area of the regurgitant orifice, as measured by the use of multidetector-row CT (MDCT), with the severity of aortic regurgitation (AR) as determined by the use of echocardiography for AR. Materials and Methods: In this study, 45 AR patients underwent electrocardiography- gated 40-slice or 64-slice MDCT and transthoracic or transesophageal echocardiography. We reconstructed CT data sets during mid-systolic to enddiastolic phases in 10% steps (20% and 35-95% of the R-R interval), planimetrically measuring the abnormally opened aortic valve area during diastole on CT reformatted images and comparing the area of the aortic regurgitant orifice (ARO) so measured with the severity of AR, as determined by echocardiography. Results: In the 14 patients found to have mild AR, the ARO area was 0.18± 0.13 cm2 (range, 0.04-0.54 cm2). In the 15 moderate AR patients, the ARO area was 0.36 ± 0.23 cm2 (range, 0.09-0.81 cm2). In the 16 severe AR patients, the ARO area was 1.00 ± 0.51 cm2 (range, 0.23-1.84 cm2). Receiver-operator characteristic curve analysis determined a sensitivity of 85% and a specificity of 82%, for a cutoff of 0.47 cm2, to distinguish severe AR from less than severe AR with the use of CT (area under the curve = 0.91; 95% confidence interval, 0.84-1.00; p < 0.001). Conclusion: Planimetric measurement of the ARO area using MDCT is useful for the quantitative evaluation of the severity of aortic regurgitation.

Original languageEnglish (US)
Pages (from-to)169-177
Number of pages9
JournalKorean Journal of Radiology
Issue number2
StatePublished - Mar 1 2010



  • Aortic regurgitation
  • Computed tomography (CT)
  • Echocardiography
  • Planimetry

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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