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Thermal lesion conspicuity following interstitial radiofrequency thermal tumor ablation in humans: A comparison of STIR, turbo spin‐echo T2‐weighted, and contrast‐enhanced T1‐weighted MR images at 0.2 T
Author(s) -
Aschoff Andrik J.,
Rafie Niusha,
Jesberger John A.,
Duerk Jeffrey L.,
Lewin Jonathan S.
Publication year - 2000
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/1522-2586(200010)12:4<584::aid-jmri10>3.0.co;2-w
Subject(s) - lesion , medicine , edema , nuclear medicine , contrast (vision) , fast spin echo , thermal ablation , radiofrequency ablation , magnetic resonance imaging , ablation , radiology , pathology , physics , surgery , optics
The purpose of this study was to compare the contrast between radiofrequency (RF) thermal liver lesions and surrounding tissue in T2‐weighted turbo spin‐echo sequences (TSE T2), short TI inversion recovery techniques (STIR), and contrast‐enhanced (CE) T1‐weighted spin‐echo images. Nineteen RF thermal ablations were performed on eight patients with metastatic liver tumors. After ablation, contrast‐to‐noise ratios (CNRs) were calculated between mean signal amplitudes from three regions of interest (ROI) (lesion, surrounding edema, and normal tissue) using TSE T2‐weighted, STIR, and contrast‐enhanced T1‐weighted (CE T1) sequences for each lesion. CNRs between the thermal lesion and normal liver tissue for both TSE T2‐weighted (mean 0.9) and STIR (2.0) images were significantly lower than for CE T1‐weighted (8.4) images ( t ‐test, α = 0.05). However, CNRs between edema rim and the core of the thermal lesion for both TSE T2‐weighted (8.1) and STIR images (7.2) were not significantly different ( t ‐test, α = 0.05) from CNRs between lesion and normal tissue for CE T1‐weighted images (8.4), nor was the CNR between edema rim and normal tissue for both TSE T2‐weighted (10.3) and STIR (9.8) images. Although the edema was not visible on CE T1‐weighted images, 18 of 19 lesions (94.7%) were surrounded by a hyperintense rim on TSE T2‐weighted or STIR images. Both TSE T2‐weighted and STIR sequences represent valid techniques for repeatable assessment of RF thermal lesions. J. Magn. Reson. Imaging 2000;12:584–589. © 2000 Wiley‐Liss, Inc.