SU-E-T-123: Development of a Methodology to Assess the Image Quality of the ExacTracTM Localization System Using the PIPSproTM Software and Unfors RaySafe Xi R/F Detector.
SU-E-T-123: Development of a Methodology to Assess the Image Quality of the ExacTracTM Localization System Using the PIPSproTM Software and Unfors RaySafe Xi R/F Detector.
复制标题
SU-E-T-123：开发一种使用 PIPSproTM 软件和 Unfors RaySafe Xi R/F 探测器评估 ExacTracTM 定位系统图像质量的方法。
DOI：
10.1118/1.4814558
复制
发表时间：
2013
期刊：
影响因子：
3.8
通讯作者：
A. Gutierrez
中科院分区：
文献类型：
--
作者：
D. Stanley;N. Papanikolaou;A. Gutierrez
目的
开发一种评估和评价BrainLab ExacTrac™系统空间分辨率、剂量、能量、噪声、对比度和几何精度一致性的方法。
方法
构建了一种器械，用于将QCkV-1体模牢固且可重复地固定在平板探测器表面。使用ExacTrac当前控制台设置-颅骨标准，每个探测器采集两个图像集。在PIPSpro™中分析两个图像集，并记录以下指标：空间分辨率（f30、f40、f50）、噪声和对比度噪声比。通过评估QCkV-1的长度来评价几何图像精度。使用Unfors RaySafe Xi R/F探测器记录剂量和kVp。评价了以下部位的kVp和剂量：颅骨（80 kV，80 mA，80 ms）、胸部（120 kV，160 mA，160 ms）、腹部（120 kV，160 mA，130 ms）和骨盆（120 kV，160 mA，160 ms）。
结果
关于空间分辨率，左侧探测器的f30、f40和f50的平均值分别为1.39±0.09、1.24±0.10和1.15±0.07，而右侧探测器分别为1.38±0.07、1.22±0.08和1.13±0.10。左侧和右侧探测器的平均CNR分别为114±10和116±13。对于几何精度，两种探测器的QCkV-1测量图像长度为218.8± 0.3 mm。左侧探测器显示剂量测量值为1.37±0.01 mGy（CS）、12.56±0.03 mGy（TS）、10.08±0.04 mGy（AS）和12.58±0.05 mGy（PS），而右侧探测器显示剂量测量值为1.27±0.01 mGy（CS）、11.48±0.03 mGy（TS）、9.21±0.04 mGy（AS）和11.50±0.04 mGy（PS），分别对于能量，左侧探测器的kVp读数为81.2±0.3（CS）、121.1±0.4（TS）、121.0±0.3（AS）和121.0±0.3（PS），右侧探测器的kVp读数为79.9±0.1（CS）、117.2 ± 0.2（TS）、117.2±0.2（AS）和117.2±0.2（PS）。
结论
开发了一种方法来评估TG-142推荐的ExacTrac™系统的基本图像质量参数。ExacTrac系统在评价的时间范围内显示了每个探测器的一致剂量、kVp、空间分辨率、CNR和几何精度。
PURPOSE
To develop a methodology of assessing and evaluating the consistency of the spatial resolution, dose, energy, noise, contrast, and geometrical accuracy of the BrainLab ExacTrac™ system.
METHODS
A device was constructed to hold the QCkV-1 Phantom firmly and reproducibly against the face of the flat panel detectors. Two image sets per detector were acquired using the ExacTrac present console setting--Cranial Standard. The two image sets were analyzed in PIPSpro™ and the following metrics were recorded: spatial resolution (f30, f40, f50), noise and Contrast-to-Noise Ratio. Geometrical image accuracy was evaluated by assessing the length of QCkV-1. Dose and kVp were recorded using the Unfors RaySafe Xi R/F Detector. The kVp and dose were evaluated for the following: Cranial (80kV,80mA,80ms), Thorax (120kV,160mA,160ms), Abdomen (120kV,160mA,130ms) and Pelvis(120kV,160mA,160ms).
RESULTS
With regards to spatial resolution, the mean values of the f30, f40 and f50 for the left detector were, 1.39±0.09, 1.24±0.10 and 1.15±0.07 respectively, while the right detector were 1.38±0.07, 1.22±0.08 and 1.13±0.10, respectively. Mean CNR for the left and right detectors was 114±10 and 116±13, respectively. For geometrical accuracy, both detectors had a measured image length of the QCkV-1 of 218.8±0.3mm. The left detector showed dose measurements of 1.37±0.01 mGy (CS), 12.56±0.03 mGy (TS), 10.08±0.04 mGy (AS) and 12.58±0.05 mGy (PS) while the right detector showed 1.27±0.01 mGy (CS), 11.48±0.03 mGy (TS), 9.21±0.04 mGy (AS) and 11.50±0.04 mGy (PS), respectively. For energy, the left detector had kVp readings of 81.2±0.3 (CS), 121.1±0.4 (TS), 121.0±0.3 (AS) and 121.0±0.3 (PS) and the right detector had 79.9±0.1 (CS), 117.2±0.2 (TS), 117.2±0.2 (AS) and 117.2±0.2 (PS).
CONCLUSION
A methodology was developed to assess the basic image quality parameters recommended by TG-142 for the ExacTrac™ system. The ExacTrac system shows a consistent dose, kVp, spatial resolution, CNR and geometrical accuracy for each detector over the evaluated timeframe.