Effect of temporal resolution on the estimation of left ventricular function by cardiac MR imaging
Effect of temporal resolution on the estimation of left ventricular function by cardiac MR imaging
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DOI：
10.1016/j.mri.2005.04.004
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发表时间：
2005-06-01
影响因子：
2.5
通讯作者：
Ohtomo, K
中科院分区：
文献类型：
--
作者：
Inoue, Y;Nomura, Y;Ohtomo, K
本研究的目的是探讨时间分辨率对心脏磁共振（MR）成像使用稳态自由进动（SSFP）序列估计左心室（LV）功能的影响。在10名健康志愿者中使用分段SSFP序列通过电影MR成像评估左心室功能。每段视图数（VPS）设置为8和20，分别导致高和低的真实时间分辨率。不考虑VPS，在40个心脏相位重建图像，提供高的表观时间分辨率。数据进行了分析，使用40，20和10个阶段，以模拟不同的表观时间分辨率。增加用于分析的心脏相位略微降低了平均收缩末期容积（ESV），略微增加了平均射血分数（EF）。在VPS为8和20之间，舒张末期容积（EDV）的估计值无实质性差异。当使用40个相位时，与VPS为8的成像相比，VPS为20的成像产生更大的ESV和更小的EF。总之，低的真实时间分辨率会导致ESV的高估和EF的低估。表观时间分辨率的提高适度地减少但不能消除由低真实时间分辨率引起的误差。(c)2005年爱思唯尔公司All rights reserved.
The aim of this study was to investigate the effect of temporal resolution on the estimation of left ventricular (LV) function by cardiac magnetic resonance (MR) imaging using a steady-state free precession (SSFP) sequence. Left ventricular function was assessed by cine MR imaging using a segmented SSFP sequence in 10 healthy volunteers. Views per segment (VPS) were set at 8 and 20, resulting in high and low true temporal resolution, respectively. Irrespective of VPS, images were reconstructed at 40 cardiac phases, providing high apparent temporal resolution. Data were analyzed using 40, 20 and 10 phases to simulate different apparent temporal resolutions. Increasing the cardiac phases used for analysis slightly decreased mean end-systolic volume (ESV) and slightly increased mean ejection fraction (EF). No substantial difference in estimates of end-diastolic volume (EDV) was found between VPSs of 8 and 20. Imaging with a VPS of 20 yielded a larger ESV and smaller EF than imaging with a VPS of 8 when 40 phases were used. In conclusion, low true temporal resolution causes overestimation of ESV and underestimation of EF. Improvement of apparent temporal resolution mildly reduces but does not eliminate the errors caused by low true temporal resolution. (c) 2005 Elsevier Inc. All rights reserved.