Patient 4 MRI

CTs and MRIs were both acquired under radiotherapy immobilization protocols with patients in the treatment position. CT scans were acquired on one of four machine models (LightSpeed RT16, GE Medical Systems, Waukesha, WI, USA; Brilliance 64 or Brilliance Big Bore, Philips Healthcare, Cambridge, MA, USA; SOMATOM Definition Edge, Siemens, Washington D.C., USA) using x-ray tube currents between 208 – 434 mA at 120 kVp. All scans have slice thicknesses of either 2.5 or 3 mm, with 2.5 or 3 mm of space between slices. Sections are displayed in 512 x 512 pixel matrices and were reconstructed in diameters between 500 – 600 mm. MRI scans were acquired in one of two machine models (Discovery MR750, GE Medical Systems, Waukesha, WI, USA; Ingenia, Philips Healthcare, Cambridge, MA, USA) in 3 Tesla magnetic fields with echo times between 97.72 – 101.82 milliseconds. All scans have slice thicknesses of 2.5 mm, with 2.5 or 4 mm of space between slices. Sections are displayed in 512 x 512 pixel matrices and were reconstructed in 256 mm diameters.

计算机断层扫描（Computed Tomography, CT）与磁共振成像（Magnetic Resonance Imaging, MRI）均按照放疗固定方案采集，患者处于治疗体位。CT扫描采用四款机型中的任意一款完成：通用医疗系统（GE Medical Systems, Waukesha, WI, USA）的LightSpeed RT16、飞利浦医疗保健（Philips Healthcare, Cambridge, MA, USA）的Brilliance 64或Brilliance Big Bore，以及西门子（Siemens, Washington D.C., USA）的SOMATOM Definition Edge；扫描参数为X射线管电流208–434 mA，管电压120 kVp。所有CT扫描的层厚为2.5 mm或3 mm，层间距为2.5 mm或3 mm，图像以512×512像素矩阵显示，重建直径为500–600 mm。MRI扫描采用两款机型中的任意一款完成：通用医疗系统的Discovery MR750，以及飞利浦医疗保健的Ingenia；扫描场强为3特斯拉，回波时间范围为97.72–101.82毫秒。所有MRI扫描的层厚为2.5 mm，层间距为2.5 mm或4 mm，图像以512×512像素矩阵显示，重建直径为256 mm。