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Table 1 MRI techniques used in the centers

From: Apparent diffusion coefficient cannot predict molecular subtype and lymph node metastases in invasive breast cancer: a multicenter analysis

Centers MR scanners DWI sequences and b values ADC measure
1 1.5 T scanner (Sonata, Siemens, Erlangen, Germany) Single-Shot Echo Planar sequence: -TR/TE: 5000/110 ms,
-FOV: 320 mm,
-matrix: 128 × 128,
-slice thickness: 3.5-mm,
− 0.7-mm slice gap,
-b values: 0–1000 s/mm2
-Manual placed multiple ROIs;
-measure by one radiologist with 10 years of experience in breast imaging;
-cystic or necrotic portions of the tumour were avoided.
2 3.0 T scanner (Magnetom Verio, Siemens, Germany) Single-Shot Echo Planar sequence: -TR/TE: 7000/85 ms,
-FOV: 104 × 320 mm,
-matrix 220 × 72,
-slice thickness: 6 mm;
b values: 50–1000 s/mm2
-Manual placed multiple ROIs (whole tumor measure);
-measure by one radiologist;
-cystic or necrotic portions of the tumour were avoided.
3 1.5 T scanner (GE Healthcare, Milwaukee, WI, USA) single-shot echoplanar image:
-TR/TE: 7000/85 ms;
-FOV 340 × 340 mm,
-matrix: 128× 128,
slice thickness: 4 mm,
b values: 0–900 s/mm2
-Manual placed ROI (single ROI measure);
-measure by one radiologist with 13 years of experience in breast imaging;
-cystic or necrotic portions of the tumour were avoided.
4 3 T scanner (Achieva Tx, Philips Healthcare, Best, Netherlands) single-shot echoplanar image with fat suppression (spectral attenuated inversion recovery):
-TR/TE: 53367000/ 61 ms,
-matrix: 240 × 240,
-FOV: 360 × 360 mm,
-slice thickness: 5 mm,
-b values: 0–800 s/mm2
-Manual placed ROI (single ROI measure);
-measure by one radiologist with 5 years of experience in breast MR imaging;
-cystic or necrotic portions of the tumour were avoided.
5 3 T scanner (Trio Tim, Siemens, Erlangen, Germany) Single-Shot Echo Planar sequence: -TR/TE: 6600/91 ms,
- matrix: 192 × 134,
-FOV: 320x320mm,
-slice thickness: 2 mm,
b values: 0–1000 s/mm2
-Manual placed ROI (single ROI measure),
-ADC measure by two radiologists with 5 and 2 years of experience in breast MRI in consensus,
-cystic or necrotic portions of the tumour were avoided.