학술논문
Planimetric quantification of mitral and tricuspid regurgitations by cine magnetic resonance imaging with gradient echo
Document Type
Conference
Author
Source
[1989] Proceedings. Computers in Cardiology Computers in Cardiology 1989, Proceedings.. :207-210 1989
Subject
Language
Abstract
Cine MRI (magnetic resonance imaging) in gradient echo is able to visualize directly rapid and turbulent flows such as regurgitations. A group of 55 patients with 40 mitral regurgitations (MR) and 26 tricuspid regurgitations (TR) was explored with a 0.28 T resistive magnet. Doppler echography and contrast angiography constitute the reference explorations. Qualitative examination of the dynamic images provides a diagnostic sensitivity for MRI of 100% versus angiography and of 88% versus echography. The three techniques are compared by four-step grading of the regurgitation severity with correlation coefficients always greater than 0.70. A more precise quantification is reached by planimetry of the signal loss jets; the most accurate quantification parameter is the mean absolute surface area of the auricular signal loss during the systole, which leads to a correlation coefficient of 0.84 (p