| Aim To evaluate the application ofFluid-Attenuated Inversion Recovery (FLAIR) pulse sequence combined with other sequences in diagnosing abdominal and pelvic lesions(especially in cyst or hemoangioma in liver and kidney), analyze the signal characteristics of distinct lesions, and explore the reasonable application extent , its advantage and disadvantage. Materials and Method Ninety patients with 226 lesions were performed MR scans with both conventional and FLAIR sequences, and then other sequences such as proton density weighted (PDW), multi-echo (ME) and contrast enhancement (CE) were undergone according to the request.Results The signal of overall cases altered on FLAIR sequences. The signal intensities were classified into three groups. Hyperintense (unchanged on FLAIR), isointense (partially decreased) and hypointense (completely depressed) were presented in 23 lesions (10.2%), 65 lesions(28.8%) and 138 lesions (61.1%) ,respectively. 175 lesions (77.4%) were diagnosed from FLAIR images, 22 lesions were diagnosed after performing PDW and ME. 46 lesions werediagnosed after contrast enhancement. The T2 value that obtained pre-and post-FLAIR has statistical significance. Conclusion Shortly after being introduced in the nineteen nineties, FLAIR sequence became a popular technique in cerebral-spinal disease due to its sensitivity in demonstrating lesions. While the application in abdominal and pelvic lesions, to our knowledge, is rare. As thediagnostic value is concerned, hypointense on FLAIR is valuable definitely (especially in cyst), lesions with isointense on FLAIR were benign, hyperintense was difficult to explain. FLAIR sequence has the following advantages: ① it is a simple, feasible and reliable technique in evaluating lesions.② helpful in determining the ingredients of cysts.③ to shorten the scanning time.④ to cut down the cost. ⑤ useful in observing the inner structure of lesion. ⑥ the ability to show small lesions near ascites and large cyst. |
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