Table 1.

MRI techniques used in the centers

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.