乳腺磁共振成像史浩-培训课件.pptVIP

* 清楚显示乳腺组织皮肤、乳头、乳晕、皮下脂肪、乳腺实质、肌肉、血管和结缔组织 * Figure 15-14. Fibroed fibroadenoma. A. Craniocaudal mammogram demonstrates one large calcification. (arrow). B. and C. precontrast and postcontrast T1 3D FLASH.Slight, homogenous enhancement is present after 0.16 mmol/kg Gd-DTPA. * Figure 11. Pre-contrast (upper) and post-contrast (lower) T1 weighted FLASH sequence. A rapidly enhancing ?broadenoma (arrow) is seen. * Figure 1. MR imaging–guided 14-gauge core biopsy of the right breast in a 48-year-old patient; an 8-mm equivocal lesion had been detected at diagnostic breast MR imaging (diagnostic image not shown). Histologic examination of the core biopsy specimen revealed myxoid fibroadenoma. Follow-up was 18 months. (a) Transverse precontrast T1-weighted gradient-echo MR image (280/4.6; flip angle, 90°). Arrowheads 5 fiducial system of stereotactic unit. (b) Transverse T1-weighted MR image (280/4.6) acquired after injection of 12 mL gadopentetate dimeglumine with the same parameters as in a shows the small well-circumscribed lesion (arrowheads) as having strong enhancement. (c) Transverse postcontrast subtraction image (b 2 a) shows the lesion as having high contrast. (d) Corresponding transverse T2-weighted turbo SE image (3,000/120) shows the lesion (arrowheads) with high signal intensity against the surrounding low-signal-intensity parenchyma. (e) Transverse postcontrast T1-weighted turbo SE image (350/10) obtained after attempted introduction of a 14-gauge core biopsy needle system shows the subcutaneous tissue (arrowheads) as displaced by the needle and shows that the target lesion itself is not visible (vanishing target). (f) Transverse T2-weighted turbo SE image (3,000/120) corresponding to e shows that the target lesion is still visible as a roundish hyperintense mass (arrowheads), as compared with the lesion in d. This suggests that the target position did not change despite the tissue shift at the needle insertion site. (g) Transverse T1-weighted turbo SE image (35