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首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >A novel method for megavoltage scatter correction in cone-beam CT acquired concurrent with rotational irradiation.
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A novel method for megavoltage scatter correction in cone-beam CT acquired concurrent with rotational irradiation.

机译：锥束CT兆伏散射校正的新方法是在旋转辐照的同时获得的。

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BACKGROUND AND PURPOSE: Acquisition of cone-beam CT (CBCT) concurrent with VMAT results in scatter of the megavoltage (MV) beam onto the kilovoltage (kV) detector deteriorating CBCT image quality. The aim of this paper is to develop a method to estimate and correct for MV scatter reaching the kV panel. MATERIAL AND METHODS: The correction method is based on an alternating pulse sequence such that the kV source is enabled in only every other frame. MV scatter, noise and artifacts in the kV-unexposed frames are separated based on their spatial and temporal frequency characteristics and subsequently subtracted from the exposed frames. The method was tested on a phantom and one lung cancer patient scanned on an Elekta Synergy system simultaneous with a 9 Gy VMAT delivery. RESULTS: Without correction, acquisition during VMAT leads to significant cupping and loss of bone contrast. The novel method removes the signal due to MV scatter. Compared to acquisition without MV beam, the reconstruction quality is identical except for some unavoidable noise due to the scattered MV radiation in the exposed frames. Correction is performed in-line with acquisition without introducing delays. CONCLUSIONS: A novel, efficient and effective method was developed to correct for MV scatter in CBCT scans acquired concurrent with rotational radiotherapy.
机译：背景与目的：与VMAT同时进行的锥形束CT（CBCT）采集会导致兆伏（MV）光束散射到千伏（kV）检测器上，从而降低CBCT图像质量。本文的目的是开发一种估计和校正到达kV面板的MV散射的方法。材料与方法：校正方法基于交替脉冲序列，从而仅在每隔一帧中启用kV源。未曝光的kV帧中的MV散布，噪声和伪影根据其空间和时间频率特性进行分离，然后从曝光的帧中减去。该方法在幻像上进行了测试，一名肺癌患者在Elekta Synergy系统上进行了扫描，同时递送了9 Gy VMAT。结果：未经矫正，在VMAT期间进行采集会导致明显的拔罐和骨对比度下降。该新颖方法去除了由于MV散射而引起的信号。与没有MV光束的采集相比，重建质量是相同的，除了由于在暴露帧中散射的MV辐射而产生的一些不可避免的噪声。校正与采集同步进行，不会造成延迟。结论：开发了一种新颖，有效，有效的方法来纠正与旋转放射治疗同时进行的CBCT扫描中的MV散射。

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