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首页> 外文期刊>Ultrasound in Medicine and Biology >Treatment of rabbit liver cancer in vivo using miniaturized image-ablate ultrasound arrays.
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Treatment of rabbit liver cancer in vivo using miniaturized image-ablate ultrasound arrays.

机译:使用微型消融超声图像在体内治疗兔肝癌。

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In the preclinical studies reported here, VX2 cancer within rabbit liver has been treated by bulk ultrasound ablation employing miniaturized image-ablate arrays. Array probes were constructed with 32 elements in a 2.3 x 20 mm(2) aperture, packaged within a 3.1 mm stainless steel tube with a cooling and coupling balloon for in vivo use. The probes were measured capable of 50% fractional bandwidth for pulse-echo imaging (center frequency 4.4 MHz) with >110 W/cm(2) surface intensity available at sonication frequencies 3.5 and 4.8 MHz. B-scan imaging performance of the arrays was measured to be comparable to larger diagnostic linear arrays, although nearfield image quality was reduced by ringdown artifacts. A series of in vivo ablation procedures was performed using an unfocused 32-element aperture firing at 4.8 MHz with exposure durations 20-70.5 s and in situ spatial average, temporal average intensities 22.4-38.5 W/cm(2). Ablation of a complete tumor cross-section was confirmed by vital staining in seven of 12 exposures, with four exposures ablating an additional margin >1 mm beyond the tumor in all directions. Analysis suggests a threshold ablation effect, with complete ablation of tumor cross-sections for exposures with delivery of >838 J acoustic energy. The results show feasibility for in vivo liver cancer ablation using miniaturized image-ablate arrays suitable for interstitial deployment.
机译:在这里报道的临床前研究中,兔肝内的VX2癌症已通过采用小型图像消融阵列的整体超声消融术进行了治疗。阵列探针由具有2.3 x 20 mm(2)孔径的32个元件构成,包装在3.1 mm不锈钢管中,带有冷却和耦合球囊,可用于体内。测得的探头能够在回声成像频率为3.5和4.8 MHz时具有> 110 W / cm(2)表面强度的脉冲回波成像(中心频率4.4 MHz)具有50%的分数带宽。阵列的B扫描成像性能被测量为可与大型诊断线性阵列相媲美,尽管近场图像质量因振铃伪影而降低。使用在4.8 MHz时未聚焦的32元素孔径发射,暴露持续时间20-70.5 s和原位空间平均时间强度22.4-38.5 W / cm(2),进行了一系列体内消融程序。在12次曝光中有7次通过活体染色确认了完整的肿瘤横截面的消融,其中4次曝光在所有方向上消融了超过肿瘤1mm的边缘。分析表明有阈值消融作用,对于暴露> 838 J声能的暴露,可完全消融肿瘤横截面。结果显示了使用适合于间隙布置的小型化图像消融阵列进行体内肝癌消融的可行性。

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