Secondly, susceptibility-induced geometric distortions are exacerbated when performing echo-planar imaging (EPI), which is a standard technique in functional studies.
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In each subject, four fMRI sessions were performed (echo-planar imaging, TR/TE = 2500/30 ms, flip = 90°, 49 slices, 96 × 96 matrix size, field of view = 288 × 288 mm, slice thickness = 3 mm, interleaved slice acquisition).
Nonetheless, in our experience, accuracy of visual LVEF grading and visual estimation of RV/LV size ratio were fairly good, even for trainees when compared with an experienced supervisor (correct grading achieved in 85% of cases for visual LVEF and in 92.5% of cases for visual estimation of RV/LV size ratio, after performing 30 echo examinations) [9].
T2 weighted imaging is most frequently performed as echo train spin echo (FSE or TSE).
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The total acquisition time was less than 40 min and included the following sequences: For Dixon FF measurement [ 23], three 2D gradient-echo acquisitions were performed with echo-times (TEs) (TE1/TE2/TE3 = 3.45/4.60/5.75 ms, TR = 100 ms, flip angle = 10°, bandwidth [BW] = 420 Hz/pixel, number of excitations [NEX] = 4, 10 × 10-mm slices with 10-mm gap).
21 Independent components analysis (ICA) was then performed on echo data from the segmented region to obtain waveforms consisting of speckle and baseband components.
