Vançon Anne-Claire, Fox Ervin R, Chow Chi-Ming, Hill Jeffrey, Weyman Arthur E, Picard Michael H, Scherrer-Crosbie Marielle
Cardiac Ultrasound Laboratory, VBK 5, Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114, USA.
J Am Soc Echocardiogr. 2002 Apr;15(4):302-8. doi: 10.1067/mje.2002.117294.
Pulse inversion harmonic imaging (PIHI) is a new modality that increases the detection of harmonic echoes and myocardial contrast by cancelling linearly transmitted signals. We tested whether PIHI improved the detection of endocardial borders in noncontrast 2-dimensional echocardiography. We compared PIHI with tissue harmonic imaging (THI), which decreases linearly transmitted signals using filters. Fundamental mode (FM) was compared with THI and PIHI in 50 consecutive patients. The global and segmental endocardial visualization scores measured with FM were significantly improved by using either THI or PIHI. The improvement of the global score compared with FM was slightly higher using PIHI than THI, because of an improved visualization of the base and the anterior wall with the PIHI technique compared with THI. The ratio of myocardial-to-cavity signal was similarly increased from FM with THI and PIHI. PIHI, a new modality for detection of myocardial contrast, can also be used for endocardial border visualization. It provides an improvement relative to THI for specific regions of the endocardium.
脉冲反转谐波成像（PIHI）是一种新的成像方式，它通过消除线性发射信号来增加谐波回波和心肌造影剂的检测。我们测试了PIHI是否能改善非造影二维超声心动图中的心内膜边界检测。我们将PIHI与组织谐波成像（THI）进行了比较，后者使用滤波器来减少线性发射信号。在50例连续患者中，将基波模式（FM）与THI和PIHI进行了比较。使用THI或PIHI时，与FM测量的整体和节段心内膜可视化评分均有显著改善。与FM相比，PIHI的整体评分改善略高于THI，这是因为与THI相比，PIHI技术能更好地显示心底和前壁。使用THI和PIHI时，心肌与心腔信号的比值与FM相比同样增加。PIHI作为一种检测心肌造影剂的新成像方式，也可用于心内膜边界可视化。相对于THI，它在心内膜的特定区域提供了改善。
