Department of Radiology, Uppsala University Hospital, Sweden.
Ups J Med Sci. 2011 Nov;116(4):258-64. doi: 10.3109/03009734.2011.596586.
M-mode echocardiography estimates of the left ventricular mass (LVM) were greater than magnetic resonance imaging (MRI) estimates. There are substantial differences between the methods both in the means of measuring and the calculation formula. The aim of this study was to investigate whether any difference in estimates of LVM between M-mode echocardiography and MRI is due to the means of measuring or to the calculation formula, using MRI as the gold standard.
M-mode echocardiography and MRI were performed on 229 randomly selected 70-year-old community-living subjects. LVM was calculated from echocardiography (LVM(echo)) and from MRI (LVM(MRI)) measurements using standard techniques. Additionally LVM was calculated with the echocardiography formula from echo-mimicking measurements made on MR images (LVM(MRI/ASE)).
There were significant differences between all three LVM estimates in women, in men, and in the entire population. Echocardiography estimated LVM to be larger than did MRI, and the LVM(MRI/ASE) estimate was larger than the LVM(MRI). The difference between LVM(MRI) and LVM(MRI/ASE) was larger than the difference between LVM(echo) and LVM(MRI/ASE). There was a low correlation between LVM(echo) and LVM(MRI) (R(2) = 0.46) as well as between LVM(MRI/ASE) and LVM(MRI) (R(2) = 0.65).
The means of measuring and the calculation formula both independently add to the error in LVM estimation with M-mode echocardiography. The error of the calculation formula seems to be greater than the error of the means of measuring in a population of community-living elderly men and women.
M 型超声心动图估计的左心室质量（LVM）大于磁共振成像（MRI）的估计值。这两种方法在测量方法和计算公式上都存在很大差异。本研究旨在探讨 M 型超声心动图和 MRI 之间 LVM 估计值的差异是否是由于测量方法或计算公式引起的，以 MRI 为金标准。
对 229 名随机选择的 70 岁社区居住者进行 M 型超声心动图和 MRI 检查。使用标准技术从超声心动图（LVM(echo)）和 MRI（LVM(MRI)）测量值计算 LVM。此外，还使用超声心动图公式从 MRI 图像上的回声模拟测量值计算 LVM（LVM(MRI/ASE)）。
在女性、男性和整个人群中，所有三种 LVM 估计值之间均存在显著差异。超声心动图估计的 LVM 大于 MRI，LVM(MRI/ASE) 估计值大于 LVM(MRI)。LVM(MRI)与 LVM(MRI/ASE)之间的差异大于 LVM(echo)与 LVM(MRI/ASE)之间的差异。LVM(echo)与 LVM(MRI)之间的相关性较低（R²=0.46），LVM(MRI/ASE)与 LVM(MRI)之间的相关性也较低（R²=0.65）。
M 型超声心动图测量方法和计算公式都会独立增加 LVM 估计的误差。在社区居住的老年男女人群中，计算公式的误差似乎大于测量方法的误差。
