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Magnetic resonance imaging of interstitial laser photocoagulation in brain

✍ Scribed by Robert A. Tracz; Dr. Douglas R. Wyman; Peter B. Little; Rheal A. Towner; Wendy A. Stewart; Stanley W. Schatz; Paul W. Pennock; Brian C. Wilson

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
958 KB
Volume
12
Category
Article
ISSN
0196-8092

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✦ Synopsis

Magnetic resonance (MR) imaging can be used to monitor the development of thermal lesions induced in tissue using interstitial laser photocoagulation (ILP). A potential application for ILP is the treatment of surgically inaccessible brain tumors. For the successful clinical application of MR-monitored ILP, it is necessary to relate MR images of ILP lesions to the actual induced lesions. In this preliminary study we performed ILP in the normal brains of anesthetized cats by delivering interstitially 1.0,1.5, and 2.0 W of continuous-wave NdYAG laser energy (1,064 nm) for 1,000s via a plane-cut 400 pm core optical fiber. At 48 h postirradiation the lesions consisted of four sharply demarcated concentric zones of thermal damage. Lesion diameter increased linearly with delivered power. T2-weighted proton spin-echo images acquired during ILP showed a region of complete or near signal loss that underestimated the actual lesion at 48 h. Gadolinium-enhanced T1-weighted spin-echo images acquired immediately post-irradiation showed the actual lesion precisely.

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