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首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >4D-CBCT reconstruction using MV portal imaging during volumetric modulated arc therapy.
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4D-CBCT reconstruction using MV portal imaging during volumetric modulated arc therapy.

机译：体积调制电弧治疗期间使用MV门控成像进行4D-CBCT重建。

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摘要

BACKGROUND: Recording target motion during treatment is important for verifying the irradiated region. Recently, cone-beam computed tomography (CBCT) reconstruction from portal images acquired during volumetric modulated arc therapy (VMAT), known as VMAT-CBCT, has been investigated. In this study, we developed a four-dimensional (4D) version of the VMAT-CBCT. MATERIALS AND METHODS: The MV portal images were sequentially acquired from an electronic portal imaging device. The flex, background, monitor unit, field size, and multi-leaf collimator masking corrections were considered during image reconstruction. A 4D VMAT-CBCT requires a respiratory signal during image acquisition. An image-based phase recognition (IBPR) method was performed using normalised cross correlation to extract a respiratory signal from the series of portal images. RESULTS: Our original IBPR method enabled us to reconstruct 4D VMAT-CBCT with no external devices. We confirmed that 4D VMAT-CBCT was feasible for two patients and in good agreement with in-treatment 4D kV-CBCT. CONCLUSION: The visibility of the anatomy in 4D VMAT-CBCT reconstruction for lung cancer patients has the potential of using 4D VMAT-CBCT as a tool for verifying relative positions of tumour for each respiratory phase.
机译：背景：记录治疗过程中的目标运动对于验证照射区域非常重要。近来，已经研究了根据在称为VMAT-CBCT的容积调制弧光治疗（VMAT）期间获得的门户图像重建锥束计算机断层扫描（CBCT）。在这项研究中，我们开发了VMAT-CBCT的三维（4D）版本。材料与方法：MV门户图像是从电子门户成像设备中顺序获取的。在图像重建过程中考虑了柔韧性，背景，监视器单位，区域大小和多叶准直仪掩盖校正。 4D VMAT-CBCT在图像采集期间需要呼吸信号。使用归一化互相关执行基于图像的相位识别（IBPR）方法，以从一系列门图像中提取呼吸信号。结果：我们最初的IBPR方法使我们能够在没有外部设备的情况下重建4D VMAT-CBCT。我们证实了4D VMAT-CBCT对于两名患者是可行的，并且与接受治疗的4D kV-CBCT完全吻合。结论：肺癌患者在4D VMAT-CBCT重建中解剖结构的可见性具有使用4D VMAT-CBCT作为验证每个呼吸阶段肿瘤相对位置的工具的潜力。

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