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Single‐shot versus interleaved echo‐planar MR ‐imaging: Application to visualization of cardiac valve leaflets
Author(s) -
Davis Clarence P.,
McKin Graerne C.,
Debatin Jorg F.,
Duewell Stefan,
Von Schulthess Gustav K.
Publication year - 1995
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880050119
Subject(s) - magnetic resonance imaging , medicine , cardiac cycle , single shot , cardiac imaging , stenosis , cardiac valve , cardiac magnetic resonance imaging , gradient echo , visualization , nuclear medicine , radiology , biomedical engineering , cardiology , computer science , physics , artificial intelligence , optics
Visualization of the cardiac valves with standard magnetic resonance (MR) imaging is not adequate because of long acquisition times. Echo‐planar imaging (PI) can, however, be performed with a temporal resolution (30–50 msec) comparable to that of echocardiography. The authors evaluated the feasibility of real‐time imaging of cardiac valve motion with ultrafast MR techniques. Eight healthy volunteers and three patients with mitral stenosis and re‐ gurgitation were studied with a 1.5‐T whole‐body im‐ ager. Two different EPI sequences were assessed: a standard single‐shot gradient‐echo EPI (GEPI) SCquence and a fast imaging technique based on multiple‐shot EPI with interleaved k‐space acquisition (IGEPI). Fat‐suppressed images with an in‐plane resolution of 3.7 × 3.7 mm were obtained equally spaced through the cardiac cycle. Half‐k‐space acquisition was used. Morphologic evaluation was superior with IGEPI, owing to the better intracavitary signal homogeneity ( P ≤ 0.01). and the mitral valve leaflets were easier to identify on systolic images. IGEPI provided adequate valve visibility in all three patients.