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KMID : 0378619930100010146
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Baptist Hospital Medical Journal
1993 Volume.10 No. 1 p.146 ~ p.151
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Physiologic AV Valvular Insufficiency in Cine MR Imaging.
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장윤형
강은주/백승국/안우현/최한용/김봉기
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Abstract
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Twenty volunteers with no known valvular abnormalities were prospectively evaluated with gradient echo cine-MR imaging to determine the extent, shape, and timing of appearance of regions of signal void near atrioventricular valve in the healthy
population. The MRI was undertaken using axial gradient echo technique with small flip angle. Repetition time(TR) was 36msec, and echo time(TE), 22msec. Transient signal void was observed within the atrium near tricuspid(13/20=65%) and mitral
valve(9/20=45%) respectively, which is so called 'Physiologic Atrioventricular Valvular insufficiency' reflecting physiologic turbulence due to high velocity blood flow across nondiseased cardiac valve. Eight subjects revealed signal void areas
near
both tricuspid and mitral valve but, vie subjects were not present evidence of physiologic insufficiency. Physiologic valvular insufficiency can be distintinguished from pathologic valvular insufficiency and draining venous flow into both right
and
left
atrium by the exent, timing of appearance, and morphology of signal void region. Physiologic condition does not extend more than 1cm proximal to A-V valve plane and generally observed only during early systole. Its morphology is semilunar or
triangular
configuration in most cases of normal tricuspid insufficiency and small globular appearance in most cases of normal mitral insufficiency, Awareness of normal signal void areas near the A-V valve and their characteristics is critical in the
interpretation of cardiac cine MR examinations and can assist study of the normal cardiac physiology.
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KEYWORD
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