Challenges and implementation of radiation-force imaging with an intracardiac ultrasound transducer
Challenges and implementation of radiation-force imaging with an intracardiac ultrasound transducer
复制标题
DOI：
10.1109/tuffc.2007.345
复制
发表时间：
2007-05-01
影响因子：
3.6
通讯作者：
Trahey, Gregg E.
中科院分区：
文献类型：
--
作者：
Hsu, Stephen J.;Fahey, Brian J.;Trahey, Gregg E.
心内超声心动图(ICE)已被证明是指导包括射频消融术(RFA)在内的多种心脏手术的一种有效的成像手段。然而，在常规超声消融过程中评估病变大小一直是有限的，因为B型图像中的相关变化通常是微妙的。声辐射力脉冲(ARFI)成像是一种有前景的监测RFA的方法，因为它能够直观地显示心肌局部硬度的变化。我们展示了心脏内探头的ARFI成像，它可以产生更高质量的病变图像。我们用ARFI成像评估了ICE探头在监测RFA方面的性能。心内探头被用来创建包含更坚硬的球形包裹物的组织模拟体模的高对比度、高分辨率ARF1图像。该探头还被用来检查一段切除的羊右室，其中有一个RFA造成的表面病变，尽管在传统的B超图像中看不到病变，但ARFI图像能够显示病变与周围组织之间的边界。然后使用心内探头进行ARF1成像，以监测活体心脏消融。在绵羊右心房行射频消融术，应用B超和ARF1超声心内探头监测病变进展情况。虽然在B超图像中几乎没有显示正在发展的病变的迹象，但相应的ARF1图像显示了消融部位周围移位较少的区域。
Intracardiac echocardiography (ICE) has been demonstrated to be an effective imaging modality for the guidance of several cardiac procedures, including radiofrequency ablation (RFA). However, assessing lesion size during the ablation with conventional ultrasound has been limited, as the associated changes within the B-mode images often are subtle. Acoustic radiation force impulse (ARFI) imaging is a promising modality to monitor RFAs as it is capable of visualizing variations in local stiffnesses within the myocardium. We demonstrate ARFI imaging with an intracardiac probe that creates higher quality images of the developing lesion.We evaluated the performance of an ICE probe with ARFI imaging; in monitoring RFAs. The intracardiac probe was used to create high contrast, high resolution ARF1 images of a tissue-mimicking phantom containing stiffer spherical inclusions. The probe also was used to examine an excised segment of an ovine right ventricle with a RFA-created surface lesion, Although the lesion was not visible in conventional B-mode images, the ARFI images were able to show the boundaries between the lesion and the surrounding tissue.ARF1 imaging with an intracardiac probe then was used to monitor cardiac ablations in vivo. RFAs were performed within the right atrium of an ovine heart, and B-mode and ARF1 imaging, with the intracardiac probe was used to monitor the developing lesions. Although there was little indication of a developing lesion within the B-mode images, the corresponding ARF1 images displayed regions around the ablation site that displaced less.