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Radiology, Vol 182, 167-174, Copyright © 1992 by Radiological Society of North America

ARTICLES

Focal liver lesions: MR imaging with Mn-DPDP--initial clinical results in 40 patients

B Hamm, TJ Vogl, G Branding, B Schnell, M Taupitz, KJ Wolf and J Lissner
Department of Radiology, Steglitz Clinic, Freie Universitat Berlin, Germany.

Manganese (II) N,N'-dipyridoxylethylenediamine-N,N'-diacetate-5,5'- bis(phosphate) (DPDP) was evaluated as a contrast agent for magnetic resonance (MR) imaging (1.5 T) of focal liver lesions in 40 patients. Doses of 5 and 10 mumol/kg were administered intravenously. Mn-DPDP- enhanced T1-weighted images were compared quantitatively and subjectively with standard T1- and T2-weighted nonenhanced images. Use of Mn-DPDP resulted in a statistically significant increase in signal intensity of liver parenchyma in T1-weighted images at both doses. No enhancement was seen in metastases, cholangiocarcinomas, or lymphomas, while all hepatocellular carcinomas were enhanced. Enhancement was seen in focal nodular hyperplasia and in regenerative nodules. The lesion-to- liver contrast in Mn-DPDP-enhanced gradient-recalled-echo images was superior to that of all precontrast images (P less than .01). The number of nonenhancing malignant liver lesions detected in spin-echo (SE) images was increased (272 in T2-weighted SE images vs 390 in T1- weighted Mn-DPDP-enhanced SE images). Image interpretation (eg, visualization and demarcation of the lesions) was markedly better in Mn- DPDP-enhanced images than in all precontrast images (P less than .001).


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