SPIO-enhanced 2D-TOF MR angiography of the portal venous system: Results of an intraindividual comparison

Peter Reimer, Christian Marx, Ernst J. Rummeny, Markus Müller, Markus Lentschig, Thomas Balzer, Karl Heinz Dietl, Udo Sulkowski, Thomas Berns, Kohkan Shamsi, Peter E. Peters

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

The purpose of this study was to investigate whether MR angiography (MRA) of the portal venous system may be improved by means of superparamagnetic iron oxides (SPIOs) during accumulation phase imaging and to study the underlying contrast mechanisms. MRA of the portal venous system was performed on 48 patients before and after intravenous injection of a new SPIO (Resovist, Schering AG, Berlin, Germany). Resovist, as a predominantly liver parenchymal darkening agent on T2-weighted MR images with uptake into the reticuloendothelial cell system, was administered intravenously by bolus injection of 8 to 12 μmol Fe/kg body weight. Patients were scanned with breath-hold coronal and axial two-dimensional (2D) time of flight (TOF) MRA (TR = 31.0 msec, TE = 9.8 msec flip angle (FA) = 50°, and 6.9-second acquisition time per section) sequences. Signal intensity values of liver parenchyma, the portal venous system, and background were obtained for quantitative analysis. The clinical relevance of additional plain and contrast-enhanced MRA studies for surgical planning was assessed by independent reading of three readers. Liver signal-to-noise ratio (SNR) significantly decreased following iv injection of Resovist; however, SNR values of the portal veins or hepatic veins did not change significantly. Visibility of the portal venous system improved significantly (tertiary branches visible: pre in 15.2% versus post in 87.0% of patients). Resovist- enhanced 2D-TOF MRA may improve planning of liver resections by better demonstrating the relationship of central liver lesions and vessels on source images. The decrease in liver SNR at a constant vessel SNR after iv injection of Resovist improves MRA of the liver. SPIO-enhanced 2D-TOF MRA scans are superior to plain 2D-TOF MRA studies and may be added for the workup of preoperative patients.

Original languageEnglish
Pages (from-to)945-949
Number of pages5
JournalJournal of Magnetic Resonance Imaging
Volume7
Issue number6
DOIs
StatePublished - Nov 1997
Externally publishedYes

Keywords

  • MR angiography
  • Portal venous system
  • Superparamagnetic iron oxide
  • Two-dimensional time of flight

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