AJR. American journal of roentgenology
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AJR Am J Roentgenol · Sep 2001
Comparative StudyDetection of malignant hepatic tumors: comparison of gadolinium-and ferumoxide-enhanced MR imaging.
The purpose of our study was to compare how well gadolinium-enhanced and ferumoxide-enhanced MR imaging reveal malignant hepatic tumors. ⋯ Gadolinium-enhanced MR imaging outperforms ferumoxide-enhanced MR imaging in revealing malignant hepatic tumors. Gadolinium-enhanced MR imaging is recommended, particularly for patients with cirrhosis.
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AJR Am J Roentgenol · Sep 2001
MR imaging and T2 mapping of femoral cartilage: in vivo determination of the magic angle effect.
The purpose of this study was to perform a quantitative evaluation of the effect of static magnetic field orientation on cartilage transverse (T2) relaxation time in the intact living joint and to determine the magnitude of the magic angle effect on in vivo femoral cartilage. ⋯ The effect of orientation on cartilage T2 is substantially less than that predicted from prior ex vivo studies. The greatest variation in cartilage T2 is observed in the superficial 20% of cartilage. Given the small orientation effect, it is unlikely that the "magic angle effect" accounts for regional differences in cartilage signal intensity observed in clinical imaging. We hypothesize that regional differences in the degree of cartilage compression are primarily responsible for the observed regional differences in cartilage T2.