CAJ | 학술논문

目的：基于被动检测的方法，探索HIFU辐照离体组织过程中，焦域处组织液沸腾的特征声信号。方法使用连续HIFU辐照脱气后的离体牛肝组织，分成四组进行实验，每组重复20次。1、2组应用50W声功率分别辐照10s和80s ，3、4组应用200W声功率分别辐照2s和5s。辐照过程中通过B超实时监控靶区回声，同时使用热电偶测量焦域处组织的温度；并通过被动检测方法系统采集焦域处的声散射信号，之后进行快速傅里叶变换。辐照结束后，切开牛肝组织，观察损伤形态。结果辐照中，第2、4组的组织焦域处温度较高，平均最高温度分别为93．52℃和87．76℃，且被动检测系统测得的信号经分析后出现四次谐波幅值的增大，通过B超观察到焦域处有明显的回声增强。而1、3组的温升较低，辐照中的平均最高温度分别为63．23℃和68．24℃，四次谐波幅值未出现明显变化，且焦域处无明显的回声增强。辐照后牛肝中均形成了凝固性坏死，且第2、4组辐照后观察到了损伤形态的形变，第1、3组未见形变。结论：HIFU辐照过程中，被动检测系统所测声散射信号的四次谐波可作为焦域处沸腾的特征声信号。
목적：기우피동검측적방법，탐색HIFU복조리체조직과정중，초역처조직액비등적특정성신호。방법사용련속HIFU복조탈기후적리체우간조직，분성사조진행실험，매조중복20차。1、2조응용50W성공솔분별복조10s화80s ，3、4조응용200W성공솔분별복조2s화5s。복조과정중통과B초실시감공파구회성，동시사용열전우측량초역처조직적온도；병통과피동검측방법계통채집초역처적성산사신호，지후진행쾌속부리협변환。복조결속후，절개우간조직，관찰손상형태。결과복조중，제2、4조적조직초역처온도교고，평균최고온도분별위93．52℃화87．76℃，차피동검측계통측득적신호경분석후출현사차해파폭치적증대，통과B초관찰도초역처유명현적회성증강。이1、3조적온승교저，복조중적평균최고온도분별위63．23℃화68．24℃，사차해파폭치미출현명현변화，차초역처무명현적회성증강。복조후우간중균형성료응고성배사，차제2、4조복조후관찰도료손상형태적형변，제1、3조미견형변。결론：HIFU복조과정중，피동검측계통소측성산사신호적사차해파가작위초역처비등적특정성신호。
Objective :To investigatethe acoustic signal characteristics of boiling induced by HIFU irradiation in ex vivo tissueby passive detection .Methods Set four groups of continuousHIFU irradiation parameters and repeated 20 times for each group .Group 1 and 2 were exposed to 50W acoustic power for 10s and 80s respectively ,while group 3 and 4were exposed to 200W acoustic power for 2s and 5srespectively .During HIFU exposurewhich is realtime monitored in B -mode ultrasound image , the temperature in the focal region was measured bythermocouple , acousticscattering signals were collected by passive detection system . ResultDuring the exposure ,the focal region average temperature was higher in group 2 and 4 ,which is 93 .52℃ and 87 .76℃respectively ,compared with63 .23℃and 68 .24℃ in group 1 and 3 .Enhanced echogenicity occurred and the fourth harmonic amplitude significantly increased in group 2 and 4 ,but not in group 1 and 3 .After HIFU irradiation ,all the exposured regions occurredcoagulation necrosis .The lesion pattern deformation appeared in group 2 and 4 ,but not in group 1 and 3 .ConclusionDuringHIFU irradiation ,the fourth harmonic of acoustic scattering signals detected by passive detection system can be used as characteristic acoustic signalof boiling in the focal region .