Abstract | PURPOSE: Comparison of various MR imaging techniques without and with the application of Gd-BOPTA for the follow-up of thermal tumor ablations by means of laser-induced therapy (LITT). MATERIALS AND METHODS: Thermal tumor ablations were performed with LITT in 19 patients showing a local recurrence. The metastases were from colorectal carcinoma in 15 cases (78.9 %) and from cervix, bronchial, gastric and renal carcinoma respectively in one patient each. The size of the metastases before ablation was on average 38.5 mm (min = 25 mm, max = 58 mm). The MRI protocol consisted of T2 UTSE FS, T1 w GRE without and with Gd-BOPTA at an early (20 s post injection) and late stage (> 120 min post injection). Two independent radiologists evaluated image contrast of the local relapse and necrosis in comparison to the surrounding healthy liver parenchyma on a scale from - 10 to + 10. Liver parenchyma was in any sequence 0. Recurrences were confirmed with follow-up examinations in all patients. Statistical analysis was performed by means of Wilcoxon and Kendall's W-test. RESULTS: Both radiologists found absolute ratios for contrast differences between thermal necrosis and local recurrence, with an average of 10.95 for T2 w UTSE FS and of 6.58 for T1 w GRE without, and of 4.05 for T1 w GRE with Gd-BOPTA in the early and of 2.26 in the late stage. Superiority for UTSE FS was significant (p < 0.05). The statistical analysis showed a high agreement for both radiologists for all values (p < 0.001). CONCLUSION: For early detection of local recurrences after thermal ablation T2 w UTSE FS is most suitable. For the detection of new foci, the use of liver specific contrast media is advisable.
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Authors | M Pech, B Spors, G Wieners, G Warschewske, A Beck, C Cho, F Fischbach, J Ricke |
Journal | RoFo : Fortschritte auf dem Gebiete der Rontgenstrahlen und der Nuklearmedizin
(Rofo)
Vol. 176
Issue 4
Pg. 550-5
(Apr 2004)
ISSN: 1438-9029 [Print] Germany |
Vernacular Title | Vergleich unterschiedlicher MRT-Sequenzen mit und ohne Applikation von Gd-BOPTA zur Verlaufskontrolle nach LITT. |
PMID | 15088180
(Publication Type: Comparative Study, Evaluation Study, Journal Article)
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Chemical References |
- Contrast Media
- Organometallic Compounds
- gadobenic acid
- Meglumine
|
Topics |
- Contrast Media
- Data Interpretation, Statistical
- Female
- Follow-Up Studies
- Humans
- Hyperthermia, Induced
(methods)
- Lasers
- Liver Neoplasms
(diagnosis, secondary, surgery)
- Magnetic Resonance Imaging
(methods)
- Male
- Meglumine
(analogs & derivatives)
- Middle Aged
- Neoplasm Recurrence, Local
(diagnosis)
- Organometallic Compounds
- Quality Assurance, Health Care
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