Liver lesion conspicuity during real‐time MR‐guided radiofrequency applicator placement using spoiled gradient echo and balanced steady‐state free precession imaging. Issue 2 (29th October 2013)

• Record Type: Journal Article
• Authors: Rempp, Hansjörg; Loh, Henning; Hoffmann, Rüdiger; Rothgang, Eva; Pan, Li; Claussen, Claus D.; Clasen, Stephan
• Is Part Of: Journal of magnetic resonance imaging. Volume 40:Issue 2(2014)
• Page Start: 432
• Page End: 439
• Publication Date: 2013-10-29
• Subjects: Magnetic resonance imaging -- Periodicals; 616
• DOI: 10.1002/jmri.24371
• Languages: English
• ISSNs: 1053-1807

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="jmri24371-sec-0001" sec-type="section"> <title>Purpose</title> <p>To retrospectively evaluate the conspicuity of liver lesions in a fluoroscopic spoiled gradient echo (GRE) and a balanced steady‐state free precession (SSFP) magnetic resonance imaging (MRI) sequence.</p> </sec> <sec id="jmri24371-sec-0002" sec-type="section"> <title>Materials and Methods</title> <p>In all, 103 patients with hepatocellular carcinomas (HCC) (41) or liver metastases (67) were treated using MR‐guided radiofrequency ablation in a wide‐bore 1.5 T scanner. A multislice real‐time spoiled GRE sequence allowing for a T1 weighting (T1W) and a balanced SSFP sequence allowing for a T2/T1W contrast were used for MR guidance. The contrast‐to‐noise‐ratio (CNR) of the lesions was calculated and lesion conspicuity was assessed retrospectively (easily detectable / difficult to detect / not detectable).</p> </sec> <sec id="jmri24371-sec-0003" sec-type="section"> <title>Results</title> <p>HCC was easily detectable in 33/52% (GRE/SSFP), difficult to detect in 30/18%, and not detectable in 37/30% of the cases. Mean CNR varied widely (9.1 for GRE vs. 16.4 for SSFP). Liver metastases were easily detectable in 58/41% (GRE/SSFP), difficult to detect in 14/21%, and not detectable in 28/38% of the cases. Mean CNR for liver metastases was 11.5 (GRE) vs. 12.7 (SSFP). Twenty percent of all lesions could not be detected with either of the MR fluoroscopy sequences.</p> </sec> <sec id="jmri24371-sec-0004" sec-type="section"> <title>Conclusion</title> <p>MR fluoroscopy using GRE and SSFP contrast enabled real‐time detectability of 80% of the liver lesions. <bold>J. Magn. Reson. Imaging 2014;40:432–439</bold>. © <bold>2013 Wiley Periodicals, Inc</bold>.</p> </sec> </abstract>