目的：运用梯度回波（ＧＲＥ）的快速场回波（ＦＦＥ）技术，对２０例肝肿块进行Ｇｄ－ＤＴＰＡ动态增强，旨在探明不同肿块的增强规律，提高肝肿块的诊断和鉴别诊断能力。材料与方法：选取经过其他影像学检查未确诊的２０例肝肿块，作常规自旋回波（ＳＥ）平扫后作Ｇｄ－ＤＴＰＡＦＦＥ序列快速动态增强扫描，分别测量病灶信号强度（ＳＩｌｅｓｉｏｎ），灶周正常肝脏信号强度（ＳＩｌｉｖｓｒ），背景噪声信号强度和标准差（ＳＩｎｏｉｓｅｃ±ｓ），计算不同病变不同时相的肝－病灶对比噪声比（Ｃ／Ｎ），描出不同肿块（本文只评价其中手术病理证实的１３例肿块，包括肝细胞癌１０例，局灶性结节增生３例的时间－病灶Ｃ／Ｎ曲线。结果：ＨＣＣ与ＦＮＨ两者曲线较接近（包括强化峰值和升降坡度），但在增强早期，ＨＣＣ的Ｃ／Ｎ值高于ＦＮＨ，３分钟以后二者强化值均下降，且ＦＮＨ的Ｃ／Ｎ值大于０，ＨＣＣ的Ｃ／Ｎ值小于０，此差异可持续１５～２０分钟。结论：不同的肝肿块，动态增强后的时间－Ｃ／Ｎ曲线不同，对ＨＣＣ及ＦＮＨ而言，增强早期（１分钟以内）及３分钟以后曲线差异较大，最有助于鉴别诊断。动态增强ＭＲ成像可作为肝脏常规ＳＥ序列成像的一种有效的补充方法。 Objective: To evaluate the enhancement of Gd-DTPA in 20 cases of hepatic masses using Gradient Echo (GRE) Fast Field Echo (FFE) technique, aiming at exploring the enhancement law of different masses and improving the diagnostic and differential diagnosis of hepatic masses. . Materials and Methods: Twenty hepatic masses not diagnosed by other imaging examinations were selected and subjected to conventional spin echo (SE) plain scans for rapid dynamic contrast-enhanced Gd-DTPAFFE scan. The signal intensity (SIlesion) of lesions was measured. Normal liver signal intensity (SIlivsr), background noise signal intensity and standard deviation (SInoisec±s), calculated liver-focal contrast to noise ratio (C/N) at different phases of different lesions, and mapped out different masses (this article only evaluated surgical pathology The 13 confirmed tumors included 10 cases of hepatocellular carcinoma and 3 cases of focal nodular hyperplasia with time-lesion C/N curve.Results: The curves of HCC and FNH were similar (including enhancement peak and elevation slope), but In the early stage of enhancement, the C/N value of HCC was higher than that of FNH. After 3 minutes, the two enhanced values ​​both decreased, and the C/N value of FNH was greater than 0, and the C/N value of HCC was less than 0. This difference is sustainable 15 to 20 Min. Conclusion: Different liver masses, dynamic enhancement The time-to-C/N curves are different, and for HCC and FNH, the differences between the early (within 1 minute) and 3 minutes later curves are larger, which is most helpful for differential diagnosis.The dynamic contrast-enhanced MR imaging can be used as a routine liver SE sequence imaging. An effective supplement method.