کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5726001 | 1609725 | 2017 | 7 صفحه PDF | دانلود رایگان |
- T2-fast field echo (T2FFE) is a T2 weighted gradient echo sequence but also has T1 shortening effect.
- T2FFE in the hepatobiliary phase (HBP) of gadoxetic acid-enhanced (Gd-EOB) MRI is useful for differentiating benign and malignant liver lesions.
- Benign lesions showed a positive contrast whereas malignant lesions showed a negative contrast on T2FFE images in the HBP of Gd-EOB-MRI.
PurposeTo optimize the flip angle (FA) of the T2 enhanced spin-echo imaging using the time reversed gradient echo (T2FFE) and evaluate its utility for differentiating hypointensity nodules in the hepatobiliary phase (HBP) of gadoxetic acid-enhanced (Gd-EOB) MRI.Materials and methodsFirst, FA optimization of the T2FFE in the HBP was investigated by comparing signal-to-noise ratio (SNR) among different FAs using phantoms. The liver-to-muscle contrast ratios (CRLiver-Muscle) and image quality among three FAs (20°, 50° and 80°) were compared using images of 10 patients. Next, the utility of the T2FFE with an optimized FA for differentiating hypointensity nodules in the HBP was assessed by comparing the lesion-to-liver contrast ratio (CRLesion-Liver) among cysts, hemangiomas, hepatocellular carcinomas, and metastatic tumors in 32 patients.ResultsSNR increased as FA increased, but leveled off at FAs of 50° and greater. The FA of 50° showed significantly better image quality scores than that of 80° (p < 0.05). After employing an FA of 50°, the CRLesion-Liver value indicated that the T2FFE depicted benign lesions as hyperintense and most malignant lesions as hypointense in relation with the liver parenchyma (p < 0.05).ConclusionThe T2FFE in the HBP of Gd-EOB-MRI is useful for differentiating benign and malignant liver lesions.
Journal: European Journal of Radiology - Volume 95, October 2017, Pages 325-331