The Value Of MRI Asymmetric Echo Three-point Method Of Water Fat Separation Sequence In Diagnosis Of Renal Angiomyolipoma

Purpose: Explore the value of the latest MRI magnetic resonance imagingsequence:the iterative decomposition of water and fat with echo asymmetricand least-squares estimation (IDEAL), so called minimum two-way estimates ofthe asymmetric echo iterative water fat separation, in the diagnosis of renalangiomyolipoma.Method: Forty-five patients of pathology proven renal angiomyolipomaunderwent both conventional sequences (T1WI,In phase and Out phase）andtransverse IDEAL (Water,Fat,In phase and Out phase) examination with GE SignaHDx3.0T MR scanner. In each scan sequence,two radiologists reviewed the signalof fat in both conventional sequence and IDEAL. The findings were correlatedwith clinical and pathological results. Statistical analysis was performed.Results:(1) Renal angiomyolipoma was shown as well-defined mass with mixedsignal in conventional sequence imaging, fat was shown as short of T1, longT2abnormal signal.In IDEAL sequence the kidneys were shown as low signalintensity in Water image and as obvious fat signal in Fat image. In phase clearlyshowed edge of the lower signal intensity, and Out phase the mass can be clearlyseen with middle signal.(2) With conventional sequeences, the agreementbetween two radiologists were low, while wiht IDEAL the agreement was high.(3)With IDEAL the rate to find fat in tumor was93.33％, while conventionalscanning only57.78％was seen.Conclusion: IDEAL was superior to the conventional scan in demonstrating theAML fat,which is very helpful in the diagnosis of AML.