Fig. 3
Measurement of IVIM parameters in the mesorectum in patient with positive mrCRM. Axial T2-weighted imaging shows a tumour lying within 1 mm of the mesorectal fascia (a1, arrow). The ROIs were delineated in the D (a2), D* (a3) and f (a4) maps in the MAT. And the values of D, D* and f were 1.38 × 10–3 mm2/s, 22.95 × 10–3 mm2/s and 0.21, respectively. The ROIs in the MDT were more than 10 mm away from the largest tumour cross-section (b1). The corresponding IVIM maps were showed in b2, b3 and b4, and the values of D, D* and f were 0.54 × 10–3 mm2/s, 11.47 × 10–3 mm2/s and 0.29, respectively