Figure 4d. Transverse T1-weighted gradient-echo MR images (2D gradient-echo sequence, 290/4.6, and 90° flip angle) and corresponding signal intensity time course graphs for 62-year-old woman with breast cancer who underwent MR imaging for preoperative staging. (a–c) For standard dynamic protocol (256 x 256 imaging matrix with temporal resolution of 69 seconds), enhancing breast cancer (arrow in a, b, and c) appeared as irregular mass with smooth borders in (a) precontrast image, (b) first postcontrast image, and (c) first subtracted postcontrast image. (d) Graph demonstrates type 2 (plateau) signal intensity time course for standard dynamic protocol. Lesion was rated as BI-RADS category 4. (e–g) For modified dynamic protocol (400 x 512 imaging matrix with temporal resolution of 116 seconds), spicules were visualized at site of enhancing breast cancer (arrow in e, f, and g) in (e) precontrast image, (f) first postcontrast image, and (g) first subtracted postcontrast image (note the visible spicules). (h) Graph demonstrates type 3 (washout) signal intensity time course for modified dynamic protocol. Lesion was rated as BI-RADS category 5. Contrast enhancement kinetics were equivalent (strong early enhancement above threshold and plateau time course) for both protocols.