HIFU治疗中生物组织声特性变化监测方法研究-电子与通信工程专业毕业论文.docx

ABSTRACT EIue t0 its unique adv刎-ages，me tecllllique of Hi曲硫ens时 focused u1仃硒ound 呷功 h懿 become one of the most potential applications of miIlilnally irⅣ懿iVe tumor讹a臼nent．hl nle讹咖ent wim HIFU technique，m order to l(iU callcer cells witllout d锄age to nonnal tissue，it is Ve巧ilnpon乏mt to moIlito血g t11e biolo百cal tissue charaCt谢stics f．orⅡle treated area． IIl thjs此sis，we use me equipment build a Hi曲i旅ms时f0Cused ul臼-asourld e)【periment甜system，and use it to hea痂19 the Pofk tis吼le heatiI培m Vi仃0．’nlen，、Ⅳe caIl o№inⅡ1e ul慨ollic eCho si舀1al da舾i11 me exp池e鸡t0 get me da：ta、Ⅳhat we眦d．A舭r data p叩cessh培，use tlle si印al processiI唱methods t0 research me aCoustic propenies’ckmges of biolo百cal tissue like t11e ul仃雒onic Veloc匆锄d me ul仃勰omc (1)Pre舭at吣the ul胁oIlic echo si鲫山data ofvi仃0 tissue讹Ch obtained by exp嘶mental system．111 order t0 uSeⅡle echo si印al da：ta more conVeIlient证ne)【t processillg，we§Ilould do preprocessiI玛for廿le si印al，like filtering and illterC晖Iting waVefoms． (2)Using Cross—correlation矗mmion procemⅡ．e to process廿1e si印al da‰detectiIlg也e time s11ifts b娟Ⅳeen t、Ⅳo baCl(scattered ul仃硒omc 万方数据 万方数据 si印als．W．e caIl find tllat t11ere do have some relation蜘p b咖een to廿le ul仃邪oIlic Veloci够锄d也e propenies of bi0109ical tissue， mat也e ul仃邪OmC velOclty wl儿mCre嬲e m也e expenmemS，a11d tne m踟Imlm ● ● ● ●． ●●● ● ● ．● ● 1 ． ’ rata take place in t11e 55℃一65℃． (3)Wre caIl find tllat mere do have some relationship b咖een t0 nle ult瑚onic attenu撕on coe伍cient锄d me properties of biological tissue by e赃．aCting me uhmsollic attenuation coe伍cient of me si鄂lal da：ta．ne ultrasollic a：tte肌ation coe伍cient、析n increase in廿le experiment due to t11e propenies of bi0109ical tissue’s change． 111en we c锄 use this relationship to monitor tlle challge of tlle pr叩emes of biolo酉cal tissue m me tr．eatInent． (4)BaSed on discrete random medium model of biolo西cal tissue， use廿le u1舰sonic echo si印als establishiI培me AR n．舭sfer缸1Ction．By usir培舭C，we call fmd out mat证80 order e毹Ct is best，也en using me burg algorimm and