Westcott J L, Ferguson D
Radiology. 1976 Feb;118(2):265-74. doi: 10.1148/118.2.265.
Based on the relationships of the aorta, right pulmonary artery (RPA), and left atrium (LA), a method for directly measuring the LA diameter is described. A line drawn downward from the anterior wall of the RPA, parallel to the barium-filled esophagus, will approximate the anterior wall of the LA and enable a direct measurement of the anteroposterior LA diameter. This radiological measurement correlated well with the echocardiographic determination of LA size in 82 adult patients. In some patients, direct measurement of LA size made it possible to detect chamber enlargement before other signs appeared. The major disadvantage of this method is the inability to clearly see the RPA in infants and in approximately 10-15% of adults.
基于主动脉、右肺动脉（RPA）和左心房（LA）的关系，本文描述了一种直接测量左心房直径的方法。从右肺动脉前壁向下画一条与充满钡剂的食管平行的线，这条线将接近左心房前壁，从而能够直接测量左心房前后径。在82例成年患者中，这种放射学测量与超声心动图测定的左心房大小相关性良好。在一些患者中，直接测量左心房大小能够在其他体征出现之前检测到心房扩大。该方法的主要缺点是在婴儿以及大约10%-15%的成年人中无法清晰看到右肺动脉。
