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Title of Journal: Eur Radiol

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Abbravation: European Radiology

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Springer-Verlag

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DOI

10.1007/s00122-008-0832-1

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1432-1084

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Microbubbles assist goat liver ablation by high in

Authors: Tinghe Yu Xionglin Fan Shuhua Xiong Kai Hu Zhibiao Wang
Publish Date: 2006/03/16
Volume: 16, Issue: 7, Pages: 1557-1563
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Abstract

High intensity focused ultrasound HIFU has been introduced to treat cancers However this therapy is a timeconsuming procedure destructing a deeper volume is also difficult as ultrasonic energy attenuates exponentially with increasing depth in tissues The aim of the present study was to investigate the effects of introducing microbubbles on liver HIFU ablation Seventeen goats were divided into groups A n=8 and B n=9 The livers in both groups were ablated using HIFU 10 MHz 22593 W/cm2 performed in the manner of a clinical regime using a clinical device A microbubble agent was bolusinjected intravenously before HIFU exposure in group B All animals in group A and seven goats in group B were euthanased to evaluate the ablation efficiency 24 h after HIFU The necrosis rate mm3/s which was the volume of necrosis tissue per second of HIFU exposure was used to judge the ablation efficiency Pathological examinations were performed to determine whether there were residual intact tissues within the exposed volume The other two goats in group B were used to determine the delayed pathological changes 7 days after ultrasonic ablation The necrosis rate mm3/s was increased in group B 144647±41960 versus 335302±124484 P=00059 Pathological examinations confirmed that there were no residual unaffected tissue focuses within the exposed volume Two remarkable changes occurred in the other two goats in group B 7 days after HIFU there were ghostcell islands at the periphery of the ablated tissues and surrounding adjacent tissues outside the reactive zone necrotized These findings showed that microbubbles could be used to assist liver HIFU ablation

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