Lightspeed rt ct

Patients were positioned supine with an individualized foam Alpha cradle placed on an indexed pelvic board with foot stocks. Patients were scanned on GE Lightspeed RT CT (Boston, Massachusetts, USA) 1.25mm slice width, helical, 0.75 pitch, no gap, 512x512 axial resolution, 650mm reconstruction diameter.
The planning MRI was performed on a 1.5 T Siemens Magneto Avanto Syngo MR B17^® (Siemens Healthcare, Erlangen, Germany). This study’s MRI sequence was a high-resolution T2-weighted scan with the following MRI parameters: T2 turbo-spin echo (TSE) with TR: 1250ms, TE: 185ms, slice thickness: 0.68mm, image matrix: 308x390 and FOV: 400x500mm with acquired voxel size of 1.30 (AP) x 1.28 (Lateral) x 1.35 (height) and reconstructed voxel size of 0.63 (AP) x 0.63 (Lateral) x 0.68 (height).

The imaging parameters used for study CT and MRI are in accordance with those used for the clinical simulation for prostate cancer patients.
Simulation CT imaging was performed on a GE Lightspeed RT CT (Boston, Massachusetts, USA) with a 1.25 mm slice width, helical, 0.75 pitch, no gap, 512 × 512 axial resolution, and a 650 mm reconstruction diameter.
Simulation MRI was performed on a 1.5 T Siemens Magneto Avanto Syngo MR B17 (Siemens Healthcare, Erlangen, Germany). The MRI sequence utilized for this study was a high-resolution 3D T2-weighted scan with a voxel size of 1 mm, as it is used as the standard planning MRI scan at the center.