Determination of right ventricular volume and function using multiple axially rotated MRI slices
Determination of right ventricular volume and function using multiple axially rotated MRI slices
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DOI：
10.1111/j.1475-097x.2011.01006.x
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发表时间：
2011-05-01
影响因子：
1.8
通讯作者：
Engvall, Jan
中科院分区：
文献类型：
--
作者：
Aneq, Meriam Astrom;Nylander, Eva;Engvall, Jan
P>背景：用于右心室 (RV) 体积和运动的传统磁共振成像 (MRI) 方法采用短轴 (SA) 方向，受到 RV 解剖结构和形状的限制。我们建议基于围绕 RV 长轴旋转的六个切片的定向，即旋转长轴 (RLA)。 材料和方法：使用电影平衡稳态自由进动 MRI 对 SA 和 RLA 中的三个模型进行研究。体积是根据分段计算的，并与真实体积进行检查。在 23 名健康男性志愿者中，我们使用了从三尖瓣中部到右心室顶点的 6 个长轴平面，以 30 度的增量旋转。为了进行比较，获取了短轴切片。两次采集的成像参数相同。 结果：右心室舒张末期 (EDV)、收缩末期 (ESV) 和每搏输出量 (SV) 在 RLA 179 中心点 1 +/- 29 中心点 3 中确定； 80 中心点 1 +/- 17 中心点 1； 99个中心点3+/-16个中心点9ml并且在SA中是174个中心点0+/-21个中心点1； 78 中心点 8 +/- 13 中心点 6； 95 中心点 3 +/- 14 中心点 5 ml，其中 P 值表示从 0 中心点 17 到 0 中心点 64 (ns) 的差异。观察者间变异性介于 3 中心点 2% 和 6 中心点 6% 之间，观察者内变异性介于 2 中心点 8% 和 6 中心点 8% 之间。在 SA 观点中，39% 的志愿者有必要就基底切片的定义达成共识，这些志愿者的 ESV 平均体积变化为 20%，EDV 平均体积变化为 10%。结论：RLA 方法可以更好地可视化和定义 RV 流入、流出和心尖。尽管需要额外的采集时间，但 RLA 定向增强了用于心脏病诊断和随访的 RV 体积的准确测量。
P>Background:The conventional magnetic resonance imaging (MRI) method for right ventricular (RV) volume and motion, using short-axis (SA) orientation, is limited by RV anatomy and shape. We suggest an orientation based on six slices rotated around the long axis of the RV, rotated long axis (RLA).Materials and methods:Three phantoms were investigated in SA and RLA using cine balanced steady-state free precession MRI. Volumes were calculated based on segmentation and checked against true volumes. In 23 healthy male volunteers, we used six long-axis planes from the middle of the tricuspid valve to the RV apex, rotated in 30 degrees increments. For comparison, short-axis slices were acquired. Imaging parameters were identical in both acquisitions.Results:Right ventricular end-diastolic (EDV), end-systolic (ESV) and stroke volumes (SV) determined in the RLA 179 center dot 1 +/- 29 center dot 3; 80 center dot 1 +/- 17 center dot 1; 99 center dot 3 +/- 16 center dot 9 ml and in the SA were 174 center dot 0 +/- 21 center dot 1; 78 center dot 8 +/- 13 center dot 6; 95 center dot 3 +/- 14 center dot 5 ml with P-values for the difference from 0 center dot 17 to 0 center dot 64 (ns). Interobserver variability ranged between 3 center dot 2% and 6 center dot 6% and intraobserver variability between 2 center dot 8% and 6 center dot 8%. In SA views, consensus for the definition of the basal slice was necessary in 39% of the volunteers for whom the average volume change was 20% in ESV and 10% in EDV.Conclusions:The RLA method results in better visualization and definition of the RV inflow, outflow and apex. Accurate measurement of RV volumes for diagnosis and follow-up of cardiac diseases are enhanced by the RLA orientation, even though additional acquisition time is required.