MR thermometry-based feedback control of laser interstitial thermal therapy at 980 nm

Background and Objectives The goal of this study was to explore the feasibility of magnetic resonance thermal imaging (MRTI)‐based feedback control of intracerebral laser interstitial thermal therapy (LITT), using a computer workstation and 980‐nm diode laser interfaced to an MR scanner. Study Desig...

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Bibliographic Details
Published in:Lasers in surgery and medicine 2004-01, Vol.34 (1), p.48-55
Main Authors: McNichols, Roger J., Gowda, Ashok, Kangasniemi, Marko, Bankson, James A., Price, Roger E., Hazle, John D.
Format: Article
Language:English
Subjects:
Animals
brain
Brain - pathology
Computer Terminals
diode laser
Dogs
Feasibility Studies
Feedback
Hyperthermia, Induced - methods
In Vitro Techniques
Laser Therapy
LITT
Magnetic Resonance Imaging
Swine
thermal imaging
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Summary:Background and Objectives The goal of this study was to explore the feasibility of magnetic resonance thermal imaging (MRTI)‐based feedback control of intracerebral laser interstitial thermal therapy (LITT), using a computer workstation and 980‐nm diode laser interfaced to an MR scanner. Study Design/Materials and Methods A computer‐controlled laser thermal therapy system was used to produce 12 ex vivo lesions in 3 canine and porcine brains and 16 in vivo lesions in 6 canines with diffusing tip fiberoptic applicators and energies from 54 to 900 J. MRTI predictions of thermal damage were correlated with histopathologic analysis. Results Under feedback control, no carbonization, vaporization, or applicator damage was observed. MRTI‐based prediction of thermal dose was not significantly different from histological evaluation of achieved thermal necrosis. Conclusions The computer‐controlled thermal therapy system was effective at regulating heating, eliminating carbonization and vaporization, and protecting fiberoptic applicators. MRTI estimation of thermal dose accurately predicted achieved thermal necrosis. Lasers Surg. Med. 34:48–55, 2004. © 2004 Wiley‐Liss, Inc.
ISSN:0196-8092
1096-9101
DOI:10.1002/lsm.10243