Department of Radiology, Rigshospitalet, Copenhagen Univsersity Hospital, Blegdamsvej 9, Copenhagen OE DK-2100, Denmark.
Diagnostics (Basel). 2012 Aug 27;2(3):34-41. doi: 10.3390/diagnostics2030034.
Image fusion involving real-time ultrasound (US) is a technique where previously recorded computed tomography (CT) or magnetic resonance images (MRI) are reformatted in a projection to fit the real-time US images after an initial co-registration. The co-registration aligns the images by means of common planes or points. We evaluated the accuracy of the alignment when varying parameters as patient position, respiratory phase and distance from the co-registration points/planes. We performed a total of 80 co-registrations and obtained the highest accuracy when the respiratory phase for the co-registration procedure was the same as when the CT or MRI was obtained. Furthermore, choosing co-registration points/planes close to the area of interest also improved the accuracy. With all settings optimized a mean error of 3.2 mm was obtained. We conclude that image fusion involving real-time US is an accurate method for abdominal examinations and that the accuracy is influenced by various adjustable factors that should be kept in mind.
实时超声（US）图像融合是一种技术，它将先前记录的计算机断层扫描（CT）或磁共振成像（MRI）重新格式化为投影，以适应初始配准后的实时 US 图像。配准通过共同的平面或点来对齐图像。我们评估了在改变参数（如患者位置、呼吸阶段和与配准点/平面的距离）时的对齐准确性。我们总共进行了 80 次配准，当配准过程的呼吸阶段与获取 CT 或 MRI 时相同时，获得了最高的准确性。此外，选择靠近感兴趣区域的配准点/平面也可以提高准确性。在优化所有设置后，平均误差为 3.2 毫米。我们得出结论，实时 US 图像融合是一种用于腹部检查的准确方法，其准确性受到各种可调因素的影响，这些因素应牢记在心。
