论文标题
实时光学跟踪导航和实时时间强度曲线的临床评估,以在盲4D对比度增强超声成像期间提供反馈
Clinical Evaluation of Real-Time Optical-Tracking Navigation and Live Time-Intensity Curves to Provide Feedback During Blinded 4D Contrast-Enhanced Ultrasound Imaging
论文作者
论文摘要
捕获体积数据时,用于3D DCE-US的当前商用矩阵传感器在捕获体积数据时不会并排显示B模式和对比度模式图像,因此在长时间采集期间,操作员没有任何位置反馈。这项研究的目的是调查使用传感器跟踪以提供定位反馈并重新对准图像以改善定量的使用。使用红外摄像头和附在X6-1矩阵传感器上的3D打印的跟踪目标中,在内部开发了介入的跟踪系统。该系统在单独的屏幕上显示虚拟探测器,并允许捕获参考位置,以便在没有B模式图像时提供操作员反馈。为了测试此设置,要求五个经验丰富的操作员使用连接到EPIQ7系统的X6-1在B模式图像中在志愿者肝脏中找到图像地标。然后,要求操作员在三种反馈方法下将换能器位置保持4分钟:i)B模式,ii)展示实时虚拟传感器,iii)盲人。计算在电影中的位移幅度是对成像位置误差的估计。我们还研究了是否可以使用换能器坐标来重新对准图像,并改善对比度超声灌注重复性。为此,根据IRB获得了总共8个患者数据。结果表明,跟踪可以帮助操作员在长时间的收购过程中保持稳定的位置。通过盲目的采集,注意到平均位移为4.58毫米(S.D. 2.65 mm)。相比之下,跟踪反馈的平均位移与3.48 mm(S.D. 0.8 mm)的B模式相当。我们还观察到灌注参数在重新对准后具有更好的可重复性。
Current commercial matrix transducers for 3D DCE-US do not display side-by-side B-mode and contrast-mode images when capturing volumetric data, thus leaving the operator with no position feedback during lengthy acquisitions. The purpose of this study was to investigate the use of transducer tracking to provide positioning feedback and to re-align images to improve quantification. An interventional tracking system was developed in house using an infrared camera and a 3D-printed tracking target attached to a X6-1 matrix transducer. The system displays a virtual probe on a separate screen and allows to capture a reference position to provide operator feedback when no B-mode image is available. To test this set-up, five experienced operators were asked to locate an image landmark within a volunteer liver in B-mode images using the X6-1 connected to an EPIQ7 system. Operators were then asked to maintain the transducer position for 4 minutes under three feedback methods: i) B-mode, ii) display of real-time virtual transducer, iii) blind. The magnitude of displacement over the cine was computed as an estimate of the imaging position error. We also investigated whether transducer coordinates can be used to re-align images due to motion and improve contrast ultrasound perfusion repeatability. A total of 8 patient data were obtained under an IRB for this. Results suggest that tracking can assist operators maintain a steady position during a lengthy acquisition. With blinded acquisition, an average displacement of 4.58 mm (S.D. 2.65 mm) was noted. In contrast, the average displacement for tracking-feedback was comparable to B-mode at 3.48 mm (S.D. 0.8 mm). We also observed that perfusion parameters had better repeatability after re-alignment.