Signa excite 1.5 t scanner

Preoperative pelvic MRI examinations were performed using a Signa Excite 1.5 T scanner for 140 patients, a Discovery MR 750 W 3 T scanner for 64 patients, and a Discovery MR 750 3 T scanner for 30 patients (GE Medical Systems, Milwaukee, WI, USA). Pelvic MRI was performed with supine body array coils. A total of 216 patients received intravenous contrast material, and the enhanced images were acquired. T2WI was the mainstay for the detection of tumor size and extent of local disease. Sagittal T2W images were selected to extract radiomics features considering their greater consistency across multiple centers compared to other T2W planes. The detailed sagittal T2W MRI acquisition parameters of each device were as follows: Signa Excite 1.5 T (TR/TE, 3400/88 ms; FOV, 270 × 270 mm²; matrix, 288 × 192; slice thickness/gap, 5.5/1 mm), Discovery MR 750 W 3 T (TR/TE, 4273/79 ms; FOV, 280 × 280 mm²; matrix, 288 × 192; slice thickness/gap, 4.5/1 mm), and Discovery MR 750 3 T (TR/TE, 3607/111 ms; FOV, 220 × 220 mm²; matrix, 288 × 192; slice thickness/gap, 5/1 mm). Sagittal T2W digital imaging and communications in medicine (DICOM) images of all patients were retrieved from the picture archiving and communication system for image feature extraction.