Abstract
Fresh Blood Imaging using variable TR and variable refocusing flip angle for non-contrast peripheral MR angiography at 3T: a 7-Minute iliac to calf station run-offs scan
Highlights
Non-contrast Fresh Blood Imaging (FBI) scan time can be greatly reduced using variable TR for imaging the peripheral artery without contrast infusion, in which each slice encoding (SE) and the followed echo train are played in a variable TR (TR=n*RR) pattern
In variable TR (vTR) FBI, the lower limit of TR depends on the length and timing of data acquisition, and it is limited by SAR, which is mostly affected by refocusing flip angle, echo train length, and echo spacing
FBI parameters: 3D coronal single shot fast spin echo with half Fourier in PE direction, TR = 2RR with vTR (1 extra RRs for the middle 20% SE steps), TE = 60 ms, 50-80 slices for each station, slice thickness = 3 mm, matrix 256 × 256; FOV 37 cm × 37 cm, parallel imaging factor = 2, refocusing flip angle = 140° (160° the middle 20% SE steps), the acquisition delay times were determined by DelayTracker; resolution 1.4 mm × 1.4 mm, refined in the RO, PE and SE directions
Summary
Non-contrast Fresh Blood Imaging (FBI) scan time can be greatly reduced using variable TR for imaging the peripheral artery without contrast infusion, in which each slice encoding (SE) and the followed echo train are played in a variable TR (vTR) (TR=n*RR) pattern. In vTR FBI, the lower limit of TR depends on the length and timing of data acquisition, and it is limited by SAR, which is mostly affected by refocusing flip angle, echo train length, and echo spacing. To reduce SAR so that the shortest TR can be enabled for the slice encodings at the kz edge, variable refocusing flip angle (vFA) is proposed in this work. The optimized vTR FBI sequence with vFA was applied on volunteers to achieve a 7-minutes 3 station run-off scan
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