The two techniques that have gleaned the most information are: (1) cine magnetic resonance imaging, where moving images of the heart are obtained throughout the entire cardiac cycle in any desired orientation; and (2) velocity flow mapping that permits quantitative calculations of blood flow, ...
心脏成像的方式很多,需要针对特定的疾病类型确定常用的检查方式,本部分推荐的选用序列包括T1-mapping和ECV(Extracellular Volume)、T2-mapping和T2*-mapping或T2* WI、血流速度编码成像(Velocity Encoding, VENC)、早期Gd-造影增强(Early Gadolinium Enhancement, EGE)和冠状动脉MRA等,由于成像控制和分析要求高,技术不够...
After real-time acquisition of the pulse wave velocity, the peak velocity of the blood flow was calculated and averaged over 15–20 cardiac cycles. Statistical differences between US and 4D PC MRI measurements were evaluated with Bland–Altman analysis [37] in SigmaPlot (Systat Software, Inc. ...
Secondary end points included cardiovascular mortality or cardiac transplantation; an arrhythmic composite of SCD or aborted SCD (appropriate ICD shock, non-fatal ventricular fibrillation, or sustained ventricular tachycardia); and a composite of heart failure (HF) death, HF hospitalization, or cardiac ...
Applications of phase-contrast flow and velocity imaging in cardiovascular MRI. European radiology. 2005 Oct;15(10):2172-84. Edelman. Contrast-enhanced MR imaging of the heart: overview of the literature. Radiology. 2004 Sep;232(3):653-68. Reeder, Du. Advanced cardiac MR imaging of ischemic...
The typical volume for a whole-heart 4D flow MRI acquisition was 144 mm (right–left), 234 (340 × 68.0%) mm (anterior–posterior), 340 mm (feet–head). Velocity encoding of 150 cm/s was used in all three directions. Prospective electrocardiogram gating was used. The cardiac phase ...
Abstract Phase-contrast magnetic resonance imaging (MRI) provides time-resolved quantification of blood flow dynamics that can aid clinical diagnosis. Long in vivo scan times due to repeated three-dimensional (3D) volume sampling over cardiac phases and breathing cycles necessitate accelerated imaging tec...
Qualitatively, the simulated 4D Flow MRI and CFD solution agreed for velocity and the primary components of Reynolds stress tensor. The lam- inar viscous stress in the post-stenosis region, however, was underestimated in the simulated MRI data (Fig. 1b). The maximum value of the laminar ...
Blood flow has many parameters; e.g. the total volume of blood per cardiac cycle or per minute, the mean velocity over the vessel area, or averaged over the time of a cardiac cycle; the shape of the velocity distribution over the vessel area (“flow profile”), or again during time ...
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