Characterization of magnetic resonance-guided high-intensity focused ultrasound (MRgHIFU)-induced large-volume hyperthermia in deep and superficial targets in a porcine model

被引:7
作者
Zhu, Lifei [1 ]
Lam, Dao [2 ]
Pacia, Christopher Pham [1 ]
Gach, H. Michael [1 ,2 ,3 ,4 ]
Partanen, Ari [5 ]
Talcott, Michael R. [6 ]
Greco, Suellen C. [6 ]
Zoberi, Imran [2 ,4 ]
Hallahan, Dennis E. [2 ,4 ]
Chen, Hong [1 ,2 ,4 ]
Altman, Michael B. [1 ,2 ,4 ]
机构
[1] Washington Univ, Dept Biomed Engn, St Louis, MO 63110 USA
[2] Washington Univ, Dept Radiat Oncol, 660 S Euclid Ave, St Louis, MO 63110 USA
[3] Washington Univ, Dept Radiol, St Louis, MO 63110 USA
[4] Siteman Comprehens Canc Ctr, St Louis, MO USA
[5] Profound Med Inc, Clin Sci, Mississauga, ON, Canada
[6] Washington Univ, Div Comparat Med, St Louis, MO 63110 USA
关键词
HIFU; hyperthermia; MR thermometry; MR-guided HIFU; image-guided therapy; PLUS REGIONAL HYPERTHERMIA; RANDOMIZED-TRIAL; MILD HYPERTHERMIA; RADIATION-THERAPY; HIGH-RISK; PROSTATE CARCINOMA; CERVICAL-CANCER; THERMAL THERAPY; MR THERMOMETRY; LOCAL-CONTROL;
D O I
10.1080/02656736.2020.1825836
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Purpose To characterize temperature fields and tissue damage profiles of large-volume hyperthermia (HT) induced by magnetic resonance-guided high-intensity focused ultrasound (MRgHIFU) in deep and superficial targetsin vivoin a porcine model. Methods Nineteen HT sessions were performedin vivowith a commercial MRgHIFU system (Sonalleve(R)V2, Profound Medical Inc., Mississauga, ON, Canada) in hind leg muscles of eight pigs with temperature fields of cross-sectional diameter of 58-mm. Temperature statistics evaluated in the target region-of-interest (tROI) included accuracy, temporal variation, and uniformity. The impact of the number and location of imaging planes for feedback-based temperature control were investigated. Temperature fields were characterized by time-in-range (TIR, the duration each voxel stays within 40-45 degrees C) maps. Tissue damage was characterized by contrast-enhanced MRI, and macroscopic and histopathological analysis. The performance of the Sonalleve(R)system was benchmarked against a commercial phantom. Results Across all HT sessions, the mean difference between the average temperature (T-avg) and the desired temperature was -0.4 +/- 0.5 degrees C; the standard deviation of temperature 1.2 +/- 0.2 degrees C; the temporal variation of T(avg)for 30-min HT was 0.6 +/- 0.2 degrees C, and the temperature uniformity was 1.5 +/- 0.2 degrees C. A difference of 2.2-cm (in pig) and 1.5-cm (in phantom) in TIR dimensions was observed when applying feedback-based plane(s) at different locations. Histopathology showed 62.5% of examined HT sessions presenting myofiber degeneration/necrosis within the target volume. Conclusion Large-volume MRgHIFU-mediated HT was successfully implemented and characterized in a porcine model in deep and superficial targetsin vivowith heating distributions modifiable by user-definable parameters.
引用
收藏
页码:1159 / 1173
页数:15
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