S. Urayama et al., Detailed motion analysis of the left ventricular myocardium using an MR tagging method with a dense grid, MAGN RES M, 44(1), 2000, pp. 73-82
Citations number
26
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging","Medical Research Diagnosis & Treatment
Detailed analysis of myocardial deformation through a whole cardiac cycle w
as accomplished using a tagging method with a high-density grid. Four sets
of tagged images with a 4-mm-spacing grid were measured by generating four
tagging pulses arranged at regular intervals in the cardiac cycle. Through
each set of images, tag intersections were tracked semi-automatically. The
estimated motions of tag intersections were concatenated so that sequential
positions of myocardium were connected through a whole cardiac cycle. In v
itro evaluation of the precision of this technique showed that the mean err
or of tracked 4-mm tag intersections was less than 0.47 +/- 0.17 mm, even o
n the quite low-contrast images, and the concatenation error caused by doub
le concatenation was comparable to the interpolation error in the subendoca
rdial area obtained with 8-mm tag intersection motion. The small difference
between the two mean distance curves of the in vivo evaluation indicated t
hat the method is useful for analyzing heart wall abnormalities. (C) 2000 W
iley-Liss, Inc.