Perry N M, Irfan A Y, Simmons S P, Thomas J M, Rees R S
Clin Radiol. 1985 May;36(3):335-9. doi: 10.1016/s0009-9260(85)80086-6.
High-kilovoltage (kV) radiography of the chest using an air gap results in magnification of the heart and thorax despite the use of a longer focus-to-film distance. One hundred patients had their recent high-kV chest radiograph compared with their previous low-kV film. There was a significant increase in all cardiac parameters. Geometric distortion of the cardiac shadow also occurred, resulting in magnification and elongation preferentially affecting the left side of the heart. We believe this causes an additional subjective impression of a large heart. Radiologists and clinicians should revalue their assessment of cardiac size when such a technique is used.
使用空气间隙进行胸部高千伏（kV）射线照相时，尽管采用了更长的焦-片距，但心脏和胸部仍会出现放大现象。100例患者的近期高千伏胸部X光片与其之前的低千伏X光片进行了对比。所有心脏参数均有显著增加。心脏阴影也出现了几何变形，导致放大和伸长，且优先影响心脏左侧。我们认为这会额外造成心脏增大的主观印象。当使用这种技术时，放射科医生和临床医生应重新评估他们对心脏大小的判断。
