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Proceedings Paper

A novel thermal accelerant for augmentation of microwave energy during image-guided tumor ablation
Author(s): William K. C. Park; Aaron W. P. Maxwell; Victoria E. Frank; Michael P. Primmer; Jarod B. Paul; Cynthia Susai; Scott A. Collins; Tiffany M. Borjeson; Greyson L. Baird; Kara A. Lombardo; Damian E. Dupuy
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Paper Abstract

The greatest challenge in image-guided thermal ablation (IGTA) of liver tumors is a relatively high recurrence rate (ca. 30%) due to incomplete ablation. To meet this challenge, we have developed a novel Thermal Accelerator (TA) to demonstrate its capability to, 1) augment microwave (MW) energy from a distance unattainable by antenna alone; 2) turn into a gel at body temperature; 3) act as a CT or US contrast. We have examined the TA efficiency using in vitro and ex vivo models: microwave power, TA dose, frequencies and TA-to-tip distance were varied, and temperature readings compared with and without TA. Using the in vitro model, it was established that both the rate and magnitude of increase in ablation zone temperature were significantly greater with TA under all tested conditions (p<0.0001). On ultrasound imaging, the TA was echogenic as gel. On CT, TA density was proportional to dose, with average values ranging from 329 HU to 3071 HU at 10 mg/mL and 1,000mg/mL, respectively. TA can be accurately deposited to a target area using CT or US as image-guidance and augment MW energy effectively so that ablation time is significantly reduced, which will contribute to complete ablation. The preliminary results obtained from in vivo experiments using swine as an animal model are consistent with the observations made in in vitro and en vivo studies.

Paper Details

Date Published: 22 February 2017
PDF: 9 pages
Proc. SPIE 10066, Energy-based Treatment of Tissue and Assessment IX, 1006602 (22 February 2017); doi: 10.1117/12.2249772
Show Author Affiliations
William K. C. Park, Rhode Island Hospital (United States)
Alpert Medical School, Brown Univ. (United States)
Aaron W. P. Maxwell, Rhode Island Hospital (United States)
Alpert Medical School, Brown Univ. (United States)
Victoria E. Frank, Rhode Island Hospital (United States)
Alpert Medical School, Brown Univ. (United States)
Michael P. Primmer, Rhode Island Hospital (United States)
Alpert Medical School, Brown Univ. (United States)
Jarod B. Paul, Rhode Island Hospital (United States)
Alpert Medical School, Brown Univ. (United States)
Cynthia Susai, Rhode Island Hospital (United States)
Alpert Medical School, Brown Univ. (United States)
Scott A. Collins, Rhode Island Hospital (United States)
Alpert Medical School, Brown Univ. (United States)
Tiffany M. Borjeson, Rhode Island Hospital (United States)
Alpert Medical School, Brown Univ. (United States)
Greyson L. Baird, Rhode Island Hospital (United States)
Alpert Medical School, Brown Univ. (United States)
Kara A. Lombardo, Rhode Island Hospital (United States)
Alpert Medical School, Brown Univ. (United States)
Damian E. Dupuy, Rhode Island Hospital (United States)
Alpert Medical School, Brown Univ. (United States)


Published in SPIE Proceedings Vol. 10066:
Energy-based Treatment of Tissue and Assessment IX
Thomas P. Ryan, Editor(s)

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