Ungated radial quiescent-inflow single-shot (UnQISS) magnetic resonance angiography using optimized azimuthal equidistant projections.
Ungated radial quiescent-inflow single-shot (UnQISS) magnetic resonance angiography using optimized azimuthal equidistant projections.
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DOI：
10.1002/mrm.25477
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发表时间：
2014-12
影响因子：
3.3
通讯作者：
Koktzoglou, Ioannis
中科院分区：
文献类型：
--
作者：
Edelman, Robert R.;Giri, Shivraman;Murphy, Ian G.;Flanagan, Oisin;Speier, Peter;Koktzoglou, Ioannis
我们假设，通过使用静态流入单次 (QISS) 技术的变体，可以在没有心脏门控的情况下获得非对比增强 MR 血管造影 (NEMRA)。在 1.5 特斯拉下对 8 名患有外周动脉疾病的患者进行了非门控 QISS (UnQISS) MRA 评估。径向采集使用优化的方位角等距投影、较长的静态流入时间（1200 ms）以确保补充饱和的平面内旋转（无论心动相位如何），以及较长的读出（1200 ms），以便为每个切片采样完整的心动周期。使用频率偏移校正反转射频脉冲获得静脉和背景组织抑制。对于 8 站全腿采集，UnQISS 的扫描时间为 15.4 分钟。使用身体线圈获得的 UnQISS MRA 的外观与使用相控阵线圈的心电门控 QISS MRA 相当。小的径向视角增量可以最大限度地减少与涡流相关的伪影，而黄金视角径向增量或笛卡尔轨迹的图像质量较差。在患者研究中，一致检测到≥50% 的狭窄。使用 UnQISS，无需心脏门控即可获得外周 NEMRA。使用固定成像参数和体线圈进行信号接收进一步简化了扫描过程。
We hypothesized that a non-contrast-enhanced MR angiogram (NEMRA) could be acquired without cardiac gating by using a variant of the Quiescent-Inflow Single-Shot (QISS) technique. Ungated QISS (UnQISS) MRA was evaluated in eight patients with peripheral arterial disease at 1.5 Tesla. The radial acquisition used optimized azimuthal equidistant projections, a long quiescent inflow time (1200 ms) to ensure replenishment of saturated in-plane spins irrespective of the cardiac phase, and a lengthy readout (1200 ms) so that a complete cardiac cycle was sampled for each slice. Venous and background tissue suppression was obtained using frequency-offset-corrected inversion radiofrequency pulses. Scan time for UnQISS was 15.4 minutes for an 8-station whole-leg acquisition. The appearance of UnQISS MRA acquired using the body coil was comparable to ECG-gated QISS MRA using phased array coils. A small radial view angle increment minimized eddy current-related artifacts, whereas image quality was inferior with a golden view angle radial increment or Cartesian trajectory. In patient studies, ≥50% stenoses were consistently detected. Using UnQISS, peripheral NEMRA can be obtained without the need for cardiac gating. The use of fixed imaging parameters and body coil for signal reception further simplifies the scan procedure.
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影响因子：
3.3
作者：
Ordidge, RJ;Wylezinska, M;Franconi, F
通讯作者：
Franconi, F
影响因子：
120.7
作者：
BAUM, RA;RUTTER, CM;MCNEIL, BJ
通讯作者：
MCNEIL, BJ
影响因子：
3.3
作者：
Edelman, Robert R.;Sheehan, John J.;Dunkle, Eugene;Schindler, Nancy;Carr, James;Koktzoglou, Ioannis
通讯作者：
Koktzoglou, Ioannis
影响因子：
3.3
作者：
Brittain, JH;Olcott, EW;Nishimura, DG
通讯作者：
Nishimura, DG
影响因子：
19.7
作者：
Hodnett, Philip A.;Koktzoglou, Ioannis;Edelman, Robert R.
通讯作者：
Edelman, Robert R.