Commentary: Characterization of Magnetic Resonance Thermal Imaging Signal Artifact During Magnetic Resonance Guided Laser-Induced Thermal Therapy

2020 ◽  
Vol 19 (5) ◽  
pp. E512-E513
Author(s):  
Daniel G Eichberg ◽  
Ricardo J Komotar ◽  
Michael E Ivan
Keyword(s):  
Magnetic Resonance ◽  
Thermal Imaging ◽  
Thermal Therapy

Characterization of Magnetic Resonance Thermal Imaging Signal Artifact During Magnetic Resonance Guided Laser-Induced Thermal Therapy

2020 ◽  
Vol 19 (5) ◽  
pp. 619-624
Author(s):  
Sean M Munier ◽  
Allison S Liang ◽  
Akshay N Desai ◽  
Jose K James ◽  
Shabbar F Danish
Keyword(s):  
Magnetic Resonance ◽  
Patient Outcomes ◽  
Thermal Imaging ◽  
Thermal Damage ◽  
Invasive Procedure ◽  
Thermal Therapy ◽  
Surgical Indications ◽  
Ablation Procedure ◽  
Future Studies

Abstract BACKGROUND Magnetic resonance-guided laser interstitial thermal therapy (MRgLITT) is a minimally invasive procedure that utilizes intraoperative magnetic resonance thermal imaging (MRTI) to generate a thermal damage estimate (TDE) of the ablative area. In select cases, the MRTI contains a signal artifact or defect that distorts the ablative region. No study has attempted to characterize this artifact. OBJECTIVE To characterize MRTI signal the artifact in select cases to better understand its potential relevance and impact on the ablation procedure. METHODS All ablations were performed using the Visualase magnetic resonance imaging-guided laser ablation system (Medtronic). Patients were included if the MRTI contained signal artifact that distorted the ablative region during the first thermal dose delivered. Ablation artifact was quantified using MATLAB version R2018a (Mathworks Inc, Natick, Massachusetts). RESULTS A total of 116 patients undergoing MRgLITT for various surgical indications were examined. MRTI artifact was observed in 37.0% of cases overall. Incidence of artifact was greater at higher powers (P < .001) and with longer ablation times (P = .024), though artifact size did not correlate with laser power or ablation duration. CONCLUSION MRTI signal artifact is common during LITT. Higher powers and longer ablation times result in greater incidence of ablation artifact, though artifact size is not correlated with power or duration. Future studies should aim to evaluate effects of artifact on postoperative imaging and, most notably, patient outcomes.

Laser-induced thermal response and characterization of nanoparticles for cancer treatment using magnetic resonance thermal imaging

2007 ◽  
Vol 34 (7) ◽  
pp. 3102-3108 ◽  
Author(s):  
Andrew M. Elliott ◽  
R. Jason Stafford ◽  
Jon Schwartz ◽  
James Wang ◽  
Anil M. Shetty ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Cancer Treatment ◽  
Thermal Imaging ◽  
Thermal Response

Effects of Intraoperative Magnetic Resonance Thermal Imaging Signal Artifact During Laser Interstitial Thermal Therapy on Thermal Damage Estimate and Postoperative Magnetic Resonance Imaging Ablative Area Concordance

2019 ◽  
Vol 18 (5) ◽  
pp. 524-530 ◽  
Author(s):  
Sean M Munier ◽  
Akshay N Desai ◽  
Nitesh V Patel ◽  
Shabbar F Danish
Keyword(s):  
Magnetic Resonance ◽  
Thermal Imaging ◽  
Thermal Damage ◽  
Cross Sectional Area ◽  
Thermal Therapy ◽  
Sectional Area ◽  
Resonance Imaging ◽  
Cross Sectional ◽  
Postoperative Magnetic Resonance Imaging ◽  
Postoperative Mri

Abstract BACKGROUND Magnetic resonance-guided laser interstitial thermal therapy (MRgLITT) is a minimally invasive procedure that utilizes intraoperative magnetic resonance thermal imaging (MRTI) to generate a thermal damage estimate (TDE) of the ablative area. In select cases, the MRTI contains a signal artifact or defect that distorts the ablative region. No study has considered the impact of this artifact on TDE accuracy. OBJECTIVE To determine the effect of intraoperative MRTI signal artifact on postoperative magnetic resonance imaging (MRI)-predicted ablative area. METHODS All ablations were performed using the Visualase MRI-Guided Laser Ablation System (Medtronic). Patients were grouped based on whether the intraoperative MRTI contained signal artifact that distorted the ablative region. Cross-sectional area of the ablative lesion from the MRI image was measured, and the difference between intraoperative TDE and postoperative MRI cross-sectional area was calculated and compared between groups with and without intraoperative MRTI artifact. RESULTS A total of 91 patients undergoing MRgLITT for various surgical indications were examined. MRTI artifact was observed in 43.9% of cases overall. The mean absolute difference between TDE and the postoperative MRI cross-sectional area was 94.8 mm2 (SEM = 11.6) in the group with intraoperative MRTI artifact and 54.4 mm2 (SEM = 5.5) in the nonartifact group. CONCLUSION MRTI signal artifact is common during LITT. The presence of signal artifact during intraoperative MRTI results in higher variation between intraoperative TDE and postoperative MRI cross-sectional ablative area. In cases in which intraoperative MRTI artifact is observed, there may be a larger degree of variation between observed intraoperative TDE and measured postoperative MRTI ablative area.

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