Noncontrast SSFP pulmonary vein magnetic resonance angiography: impact of off-resonance and flow.
Noncontrast SSFP pulmonary vein magnetic resonance angiography: impact of off-resonance and flow.
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DOI：
10.1002/jmri.22356
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发表时间：
2010-11
影响因子：
4.4
通讯作者：
Nezafat, Reza
中科院分区：
文献类型：
--
作者：
Hu, Peng;Stoeck, Christian T.;Smink, Jouke;Peters, Dana C.;Ngo, Long;Goddu, Beth;Kissinger, Kraig V.;Goepfert, Lois A.;Chan, Jonathan;Hauser, Thomas H.;Rofsky, Neil M.;Manning, Warren J.;Nezafat, Reza
探讨非对比稳态自由旋进（SSFP）肺静脉（PV）MR血管造影（MRA）中，肺静脉（PV）非共振和血流作为信号空伪影的原因。对11名健康成人受试者和10名房颤（AF）患者进行了PV血液非共振测量。7例健康受试者采用1.5T的三维选择性SSFP序列进行非增强PV MRA，信号轮廓偏移为0- 125 Hz。对5名健康受试者进行了肺静脉时间分辨血流速度的测量。对6名健康受试者研究了血流的影响，对他们进行了两次SSFP PV MRA，ECG触发延迟分别对应于低血流和高血流。健康受试者右下、左下、右上级和左上级肺静脉的肺静脉非共振频率分别为97± 27 Hz、65± 20 Hz、74± 25 Hz和52± 17 Hz，房颤患者分别为74± 20 Hz、38± 9 Hz、51± 20 Hz和28± 11 Hz（均P<0.01）。非共振导致肺静脉出现严重的信号空洞。在肺静脉血流较高的中期采集的信号导致左心房中出现额外的信号空白，通过将ECG触发延迟设置为晚期可减少该情况。PV非共振和血流导致非对比三维板层选择性SSFP PV MRA中的信号空伪影。
To investigate pulmonary vein (PV) off-resonance and blood flow as causes of signal void artifacts in non-contrast steady-state-free-precession (SSFP) PV MR angiography (MRA). PV blood off-resonance was measured on 11 healthy adult subjects and 10 atrial fibrillation (AF) patients. Non-contrast PV MRA was performed using a three-dimensional slab-selective SSFP sequence at 1.5T on 7 healthy subjects with signal profile shifts of 0-125Hz. The time-resolved blood flow velocity of the PVs was measured on 5 healthy subjects. The impact of flow was studied on 6 healthy subjects, on whom SSFP PV MRA was acquired twice with the ECG trigger delay corresponding to low and high flow, respectively. The PV off-resonance were 97±27Hz, 65±20Hz, 74±25Hz, and 52±17Hz for right inferior, left inferior, right superior and left superior PVs, respectively, on healthy subjects, and were 74±20Hz, 38±9Hz, 51±20Hz, and 28±11Hz on AF patients (P<0.01 for all). The off-resonance caused severe signal voids in the PVs. Signal acquired during mid-diastole with high PV flow caused additional signal voids in the left atrium, which was reduced by setting the ECG trigger delay to late-diastole. PV off-resonance and flow causes signal void artifacts in non-contrast three-dimensional slab-selective SSFP PV MRA.
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