Real-Time Guidance and Thermal Monitoring of Interstitial Laser Ablation of Osteoid Osteomas in an Open High-Field MRI

Florian Streitparth¹, Bernhard Gebauer², Jens Rump², Sascha Chopra², Florian Wichlas², Bernd Hamm², Ulf Teichgrber²

Under CT-guidance, interstitial laser ablation (ILA) in the treatment of osteid osteoma (Oo) has been successfully applied. After only one publication has described ILA of the Oo under low-field (0.23T) MR-guidance, we have evaluated the feasibility of ILA in an open high-field MRI (1.0T). 5 patients underwent ILA under open MR-guidance. All lesions were successfully localized and targeted under near real-time MR-fluoroscopy with fast turbo spin echo sequences. The laser ablation was monitored online with conventional magnitude images (T1 effect) of a gradient echo sequence. Color-coded proton resonance frequency (PRF) phase mapping data was found to be valuable.