MRI-based radiomics to predict response in locally advanced rectal cancer: comparison of manual and automatic segmentation on external validation in a multicentre study

European Radiology Experimental

Table 1 Multiparametric MRI acquisition

Parameters		Centre A	Centre B	Centre C
T2w	TR/TE	7,660/110 ms	3,231/90 ms	5,085/100 ms
	Acquisition matrix	416 × 224	320 × 311	512 × 512
	Slice thickness	4 mm	3.5 mm	3 mm
	Pixel size	0.43 × 0.43 mm²	0.47 × 0.47 mm²	0.8 × 0.8 mm²
	FOV	220 mm × 220 mm	240 mm × 240 mm	250 mm × 250 mm
	Flip angle	90°	90°	90°
DWI	TR/TE	2,000/87 ms	4,011/91 ms	2,694/68 ms
	Acquisition matrix	96 × 128	100 × 98	124 × 101
	Slice thickness	4 mm	3.5 mm	3 mm
	Pixel size	0.86 × 0.86 mm²	1.88 × 1.88 mm²	2.8 × 2.8 mm²
	FOV	220 mm × 220 mm	240 mm × 240 mm	345 mm × 345 mm
	Flip angle	90°	90°	90°
	b-value max	1,200 s/mm²	1,000 s/mm²	1,000 s/mm²