Abstract
Abstract Motion of the coronary arteries during the heart cycle can
result in image blurring and inaccurate flow quantification by MR.
This condition applies particularly for longer acquisition windows
that are typical of breath-hold coronary flow measurements. To determine
the sensitivity of the technique to in-plane motion of different
coronary arteries, the temporal variation in coronary position was
measured in a plane perpendicular to the proximal portion of the
vessel. The results indicated the presence of substantial displacement
of the coronary arteries within the cardiac cycle, with a magnitude
of motion approximately twice as large for the right as for the left
coronary arteries. An estimation of the resulting vessel blurring
was calculated, showing that the duration of the acquisition window
for high spatial resolution coronary flow acquisitions should be
less than 25 to 120 msec, depending on the specific coronary artery
studied. In addition, these data specify optimal acquisition window
placement for high resolution coronary angiography.
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