Department of Electronic and Electrical Engineering, University of Bath, Bath, UK.
Physiol Meas. 2011 Jan;32(1):19-34. doi: 10.1088/0967-3334/32/1/002. Epub 2010 Nov 19.
Cone-beam CT (CBCT) is an imaging technique used in conjunction with radiation therapy. For example CBCT is used to verify the position of lung cancer tumours just prior to radiation treatment. The accuracy of the radiation treatment of thoracic and upper abdominal structures is heavily affected by respiratory movement. Such movement typically blurs the CBCT reconstruction and ideally should be removed. Hence motion-compensated CBCT has recently been researched for correcting image artefacts due to breathing motion. This paper presents a new dual-modality approach where CBCT is aided by using electrical impedance tomography (EIT) for motion compensation. EIT can generate images of contrasts in electrical properties. The main advantage of using EIT is its high temporal resolution. In this paper motion information is extracted from EIT images and incorporated directly in the CBCT reconstruction. In this study synthetic moving data are generated using simulated and experimental phantoms. The paper demonstrates that image blur, created as a result of motion, can be reduced through motion compensation with EIT.
锥形束 CT（CBCT）是一种与放射治疗相结合使用的成像技术。例如，CBCT 用于在放射治疗前验证肺癌肿瘤的位置。胸部和上腹部结构的放射治疗准确性受呼吸运动的严重影响。这种运动通常会使 CBCT 重建模糊，理想情况下应将其去除。因此，最近已经研究了运动补偿 CBCT 以校正由于呼吸运动引起的图像伪影。本文提出了一种新的双模方法，其中使用电阻抗断层成像（EIT）辅助 CBCT 进行运动补偿。EIT 可以生成电特性对比度的图像。使用 EIT 的主要优点是其高时间分辨率。在本文中，运动信息从 EIT 图像中提取出来，并直接纳入 CBCT 重建中。在这项研究中，使用模拟和实验模型生成了合成运动数据。本文表明，通过 EIT 进行运动补偿可以减少由于运动而产生的图像模糊。
