Payot M, Anderegg A
Schweiz Med Wochenschr. 1979 Jul 28;109(29):1067-76.
Mode-M echocardiography is the most valuable non invasive technique in cardiology, but as a one-dimensional technique it displays the cardiac structure in an unfamiliar form without resemblance to the cardiac anatomy. Two-dimensional ultrasonic imaging of the heart overcomes this disadvantage. However, the definition of these scanners leaves much to be desired and becomes very poor when the stop-frame mode is used. The major disadvantages of the "multiscan" are the length of the multicrystal transducer, distortion of the picture, spurious echoes and verticalization. The sector scanner has smaller transducers fitting the "echocardiographic window" and permitting an apical, subxiphoid and suprasternal approach. However, with this system resolution is usually poor in the first anterior 3.5--4 cm after the thoracic wall. The mechanical scanner causes a vibrating sensation occasionally irritating to the patient. The electronic sector scanner has the widest angle and provides the best quality images. Unfortunately, its cost is markedly higher than that of other two-dimensional systems.
M型超声心动图是心脏病学中最有价值的无创技术，但作为一种一维技术，它以一种不熟悉的形式显示心脏结构，与心脏解剖结构毫无相似之处。心脏的二维超声成像克服了这一缺点。然而，这些扫描仪的清晰度仍有很大的提升空间，在使用静态帧模式时会变得非常差。“多扫描”的主要缺点是多晶体换能器的长度、图像失真、伪像回声和垂直化。扇形扫描仪的换能器较小，适合“超声心动图窗口”，并允许采用心尖、剑突下和胸骨上的检查方法。然而，使用该系统时，在胸壁后的前3.5 - 4厘米处分辨率通常较差。机械扫描仪偶尔会引起振动感，使患者感到不适。电子扇形扫描仪具有最宽的视角，提供的图像质量最好。不幸的是，其成本明显高于其他二维系统。
