1.5 tesla mr scanner

The 3DGRE and STIR breast MRIs were performed as described previously [9 (link)]. Briefly, subjects were scanned in a prone position using a 1.5-Tesla MR scanner (General Electric, Waukesha, WI). The 3DGRE, a gradient-echo pulse sequence, took 3 minutes to be completed, and the imaging parameters were repetition time/echo time (TR/TE) = 5.9/1.4 ms, flip angle = 10°, acquisition matrix size = 256 × 256, reconstruction matrix size = 512 × 512, number of excitation (NEX) = 2, field of view (FOV) = 28–35 cm, and slice thickness = 1.5 mm (interpolated). The STIR protocol, a fat suppressing, fast inversion spin echo pulse sequence, took about 15 minutes to be completed, and the imaging parameters were TR/TE = 6050/12.9 ms, flip angle = 90°, an inversion time of 150 ms, acquisition matrix = 256 × 192, reconstruction matrix = 256 × 256, FOV = 28–35 cm, and slice thickness = 2 mm with 0 gap. The image acquisition was interleaved and repeated three times. After a MRI procedure, a 3D volume-rendered breast model was generated for the left breast ROI from either the 3DGRE or STIR protocol, respectively [9 (link)].

We utilized a GE 1.5 Tesla MR Scanner with gradient field strength and phased line loop channels. The fetal brain scans included SSFSE and FIESTA sequences in standard cross-sections, coronal, and sagittal planes, along with DWI and T 1 fat-pressing sequences in cross-sections. The scanning time for all sequences did not exceed 15 min.