高强聚焦超声无创性外科的兴起

本文首先简要地回顾了超声治疗的发展历史。继而介绍了本世纪九十年代初,在国际上兴起的旨在用于治疗肿瘤的高强聚焦超声(HIFU)无创性外科技术及其历史背景,最后作者重点论述了我国在研究、开发与临床应用HIFU技术方面一举跃为世界领先地位的迅速发展形势、并展望了HIFU的广阔发展前景。

Fine particle aggregating and flotation behavior induced by high intensity conditioning of a CO_2 saturation slurry

The influence on fine particle aggregation and flotation behavior induced by high intensity conditioning(HIC) from saturated of the slurry with CO2 saturation was investigated.Bubble size measurements were conducted.The effect of dissolved gas,xanthate addition and agitation speed on fine sphalerite particle aggregation-and flotation-behavior were studied.The results show that during HIC in air or CO2 saturated water xanthate acts as a frother.The dissolved gas content in the pulp and HIC play a synergistic role in promoting fine particle aggregation and hence flotation;a significantly enhanced aggregation of fine sphalerite particles in a CO2 saturated slurry by HIC is observed.The aggregate size increased when the agitation speed was increased from 700 r/min to 1500 r/min.Increasing the HIC speed to 1500 r/min caused a positive impact on flotation kinetics.Further increasing the speed to 2000 r/min resulted in an adverse effect on flotation kinetics.

高强度聚焦超声治疗胰腺癌疼痛的荟萃分析

目的探讨高强度聚焦超声（HIFU）对胰腺癌疼痛的疗效及其安全性。方法收集2001年至2007年2月期间国内应用HIFU治疗胰腺癌疼痛的资料较为齐全的文献进行荟萃分析。对所选文献的HIFU机器型号、治疗剂量、胰腺癌缓解率、疼痛总缓解率、疼痛消失率以及并发症等方面进行详细记录，着重分析治疗后胰腺癌癌痛缓解率和消失率以及不良反应发生率等指标。结果共有16篇413例患者纳入分析，胰腺癌疼痛总缓解率为31．3％～100％（中位缓解率为80．0％），疼痛消失率为10．8％～88．9％（中位消失率为28.0％）；联合化疗药物可显著增强其镇痛作用；不良反应少，少数可出现淀粉酶升高、AP、局部腹膜炎等并发症。结论HIFU为缓解胰腺癌疼痛的安全有效措施。