Assessment of in vivo laser ablation using MR elastography with an inertial driver

Jun Chen, David A Woodrum, Kevin J. Glaser, Matthew Murphy, Krzysztof Gorny, Richard Lorne Ehman

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Purpose To evaluate the feasibility of using MR Elastography (MRE) to monitor tissue coagulation extent during in vivo percutaneous laser ablation of the liver. Methods A novel inertial acoustic driver was developed to apply mechanical waves via the ablation instrument. Ablation testing was performed in live juvenile female pigs under anesthesia in a 1.5-T whole-body MRI scanner. Results The inertial driver produced suitable mechanical wave fields in the liver before, during, and after the laser ablation. During 2-min ablations using 4.5-, 7.5- and 15-W laser power, the stiffness of the lesions changed substantially in response to laser heating, indicative of protein denaturation. After a lethal thermal dose (2-min, 15-W) ablation, lesion stiffness was significantly greater than the baseline values (P < 0.007) and became stiffer over time; the mean stiffness increments from baseline were significantly greater than those after lower dose (2-min, 7.5-W) ablations (64.4% vs. 22.5%, P = 0.009). Conclusion MRE was shown capable of measuring tissue stiffness changes due to in vivo laser ablation. If confirmed through additional studies, this technology may be useful in clinical tumor ablation to monitor the spatial extent of tissue coagulation.

Original languageEnglish (US)
Pages (from-to)59-67
Number of pages9
JournalMagnetic Resonance in Medicine
Volume72
Issue number1
DOIs
StatePublished - 2014

Fingerprint

Elasticity Imaging Techniques
Laser Therapy
Lasers
Protein Denaturation
Liver
Acoustics
Heating
Swine
Anesthesia
Hot Temperature
Technology
Neoplasms

Keywords

  • in vivo
  • MR elastography
  • thermal ablation
  • tissue denaturation

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this

Assessment of in vivo laser ablation using MR elastography with an inertial driver. / Chen, Jun; Woodrum, David A; Glaser, Kevin J.; Murphy, Matthew; Gorny, Krzysztof; Ehman, Richard Lorne.

In: Magnetic Resonance in Medicine, Vol. 72, No. 1, 2014, p. 59-67.

Research output: Contribution to journalArticle

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