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HIFU联合微泡造影剂辐照离体再灌注人子宫肌瘤标本的声像图特点
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摘要
研究背景
     子宫肌瘤是女性生殖系统最常见的一种良性肿瘤,多见于30~50岁妇女。多无症状,少数表现为阴道出血、腹部触及肿物、压迫症状等。是月经过多和异常子宫出血的主要原因。目前对于症状性子宫肌瘤的主要治疗方法包括手术治疗,药物治疗,微创治疗,高强度聚焦超声(High intensity focused ultrasound,HIFU)治疗等。HIFU技术因无电离辐射、非侵入性、可重复治疗等在子宫肌瘤治疗领域极具潜力。在HIFU辐照靶区过程中,组织声环境(Acoustic environment in tissue,AET)是影响HIFU能量沉积的重要因素。近年来,研究表明微泡造影剂是一种提高HIFU疗效的增效剂,且HIFU治疗效率与微泡造影剂的剂量相关。
     子宫肌瘤没有成型的动物模型,故本研究构造人子宫肌瘤标本的离体再灌注模型,观察单纯HIFU辐照以及HIFU联合不同浓度微泡造影剂辐照标本后靶区灰度随时间动态变化规律以及辐照后不同时间点靶区回声增强区域面积与凝固性坏死面积的相关性,为HIFU联合微泡造影剂治疗子宫肌瘤的超声实时监控提供依据。
     目的
     通过HIFU联合不同浓度微泡造影剂辐照离体再灌注人子宫肌瘤标本,探讨HIFU辐照标本后不同时间点靶区灰度随时间动态变化特点以及辐照后不同时间点靶区回声增强区域面积与凝固性坏死面积的相关系数,为掌握辐照剂量、终止辐照时间及声像图判断靶区凝固性坏死范围提供依据。
     材料和方法
     1研究对象
     因子宫肌瘤而做子宫全切术的新鲜完整离体子宫标本18个,征询患者意愿获得同意并经学校伦理委员会同意后取得。
     2设备及药品
     BT-50E型蠕动泵(重庆杰恒蠕动泵有限公司生产),转速0.1~50rpm,出水量0.001~18ml/min。
     Philips IU22彩色多普勒超声诊断仪,探头频率3.5MHz。JC200型聚焦超声肿瘤治疗系统及灰度处理软件(重庆海扶(HIFU)技术有限公司生产)。
     SonoVue超声微泡造影剂(意大利博莱科公司(Bracco)生产)肝素,乳酸林格液,氯化三苯基四氮唑(Triphenyl tetrazolium chloride,TTC)染色液。
     3方法
     3.1标本的准备:获取离体子宫标本后即刻行肝素化处理,双侧子宫动脉插管,接通蠕动泵泵入肝素化的乳酸林格液。应用彩色多普勒血流成像(Color Doppler flowing image,CDFI)及脉冲多普勒(Pulse wave,PW)成像技术观察标本再灌注情况,采集彩色多普勒及脉冲多普勒频谱信号。
     3.2实验分组:单纯HIFU辐照组,HIFU联合造影剂辐照组
     3.3 HIFU辐照:单纯HIFU辐照组将连接体外灌流装置的离体子宫标本放入盛脱气水的容器内。开启蠕动泵,持续泵入乳酸林格液。选择无囊性变的子宫肌瘤平面进行HIFU定点辐照。辐照参数:辐照声功率:200w;辐照深度20mm;辐照方式:定点辐照;辐照时间:5s、10s。每次采集HIFU辐照前及辐照后即刻、1、2、5min的靶区声像图,测量靶区灰度值并测量辐照后各个时间点声像图上靶区回声增强区域面积。辐照后剖开标本,寻找损伤点,进行TTC染色,测量凝固性坏死面积后石蜡切片行HE染色光镜观察。采用SAS8.1统计软件包分析不同辐照参数对靶区灰度、凝固性坏死面积的影响及辐照后不同时间点靶区灰度值差异是否具有统计学意义,并计算辐照后不同时间点声像图上靶区回声增强区域面积与凝固性坏死面积的相关系数。HIFU联合微泡造影剂辐照组在接通蠕动泵后,通过灌流装置的三通开关向标本内注入不同浓度SonoVue超声微泡造影剂。通过机载超声选取有造影剂充填的子宫肌瘤平面进行HIFU辐照。辐照参数、观察指标、统计方法、辐照后处理同HIFU组。
     结果
     1.对经过肝素抗凝的离体人子宫肌瘤标本进行再灌注后, CDFI检查见肌瘤周边彩色信号填充,肌瘤内部偶见点状彩色信号,并见类似门静脉的带状等速PW频谱信号。表明肌瘤标本再灌注成功,已经将乳酸林格液泵入离体子宫肌瘤标本的肌瘤内部。
     2. HIFU定点辐照标本,辐照后不同时间点靶区灰度值不同,辐照后即刻靶区灰度值最高,辐照后1min后靶区灰度值趋于稳定。辐照参数200w,辐照时间10s,辐照深度20mm,辐照结束1min时靶区灰度值为29.40±3.44。辐照后不同时间点,靶区回声增强区域面积呈下降趋势,不同时间点声像图上靶区回声增强区域面积与凝固性坏死面积具有很高的相关系数,辐照结束2min靶区回声增强区域面积与凝固性坏死面积相关系数最高,达0.99957。
     3. HIFU联合微泡造影剂定点辐照标本时,辐照结束2min后靶区灰度值趋于稳定。辐照结束5min声像图上靶区回声增强区域面积与凝固性坏死面积面积相关系数最高,达0.92。
     结论
     1.建立离体子宫肌瘤标本再灌注模型,可以模拟在体子宫的血液循环状态,为子宫肿瘤的基础与临床研究提供接近在体环境的平台。
     2.单纯HIFU辐照后,靶区灰度值在辐照结束1min趋于稳定,辐照结束2min靶区回声增强区域面积与凝固性坏死面积相关系数最高。
     3. HIFU联合微泡造影剂辐照后,靶区灰度值需要比单纯HIFU辐照组更长的时间才能趋于稳定,靶区回声增强区域面积与凝固性坏死面积的相关系数较单纯HIFU辐照组降低。
     4.辐照参数相同,微泡造影剂浓度越高,辐照后靶区灰度越高。
     5.微泡造影剂需要达到一定浓度,才能达到增加靶区凝固性坏死面积的目的。
Backgrounds
     Hysteromyoma is the most common benign tumor of female reproductive system, predilection in women of 30-50 years old, which is the main cause of menometrorrhagia and abnormal uterine bleeding(AUB), although most of patients suffered of it are absence of symptoms while a few appear vaginal bleeding, lump touched from abdomen, bladder oppression, torsion of pedicle et al. At present, the main therapies of hysteromyoma with symptoms include operation, drug treatment, small trauma treatment, High intensity focused ultrasound (HIFU) treatment, et al. HIFU has great potential for treatment of hysteromyoma for its advantages of no ionization radiation, noninvasive and retreatmentable.
     In the process of HIFU radiance target area, Acoustic environment in tissue (AET) is an important factor that influence the accumulation of HIFU energy. In recent years, many researches suggested that ultrasonic contrast agent was an potentiator of improving HIFU therapeutic effect in a dose-dependent manner.
     There is no good animal model of hysteromyoma, therefore, ex vivo circulation model of human hysteromyoma were constructed to investigate dynamic variances of gray scales in target area after perfused with SonVue in different dose and radiance by HIFU and observe the correlation between hyperechogenicity area and actual necrosis area at different time points after radiance and provide evidences for ultrasound real time monitoring the process of treating hysteromyoma by HIFU with SonVue.
     Objective
     Dynamic variances of gray scales in target area after human ex vivo hysteromyoma reperfused with SonVue in different dose and radiance by HIFU and the correlation between hyperechogenicity area and necrosis area at different time points after radiance were investigated to obtain the accurate radiance dose, exposure time and how to judge necrosis area by ultrasound.
     Materials and methods
     Subjects
     18 complete fresh ex vivo uterus from patients suffered from hystero- myoma by total hysterectomy was obtained with the permission of patients and school Ethics Committee.
     Equipments and drugs
     BT-50E peristaltic pump (Chongqing Jieheng peristaltic pump limited company), rotation speed:0.1-50rpm, stream speed:0.001-18ml/min.
     Philips IU22 color doppler ultrasonograph, frequency of probe: 3.5MHz.
     JC200 HIFU device and gray measure software (Chongqing HAIFU (HIFU) Technology Co, Ltd).
     SonoVue (Bracoo, Milan, Iatly ) was used as contrast agent in the study.
     Heparin, Ringer lactate solution, Triphenyl tetrazolium chloride (TTC) staining solution
     Methods
     Ex vivo uteruses were pumped into heparinizated Ringer-Locke liquor from both uterine arteries by peristaltic pump immediately after obtained. Then the reperfusion information of uterus was detected by Color doppler flowing image (CDFI) and Pulse wave(PW) imaging. Grouping:Single HIFU radiance group, HIFU with SonoVue group
     In single HIFU radiance group, ex vivo uterus connected with vitro perfusion device was put into container with de-aerated water. Then the peristaltic pump was opened and Ringer-Locke liquor was pumped into uterus from the peristaltic pump. Hysteromyoma planes without cystis degeneration were selected to radiate by HIFU in fixed points. Parameter: acoustic power:200w;depth:20mm;radiance mode:fixed-point radiance; exposure time:5s, 10s. Sonograms of target area were captured every time before HIFU radiance and after radiance for 0, 1, 2, 5min and gray scale and hyperechogenicity areas of target area sonograms were measured. Hysteromyoma was split and stained by TTC after HIFU radiance to search lesion area and measure necrosis area before paraffin section and HE staining were progressed. Influences of different dosage of HIFU on gray scale of target area and differences between gray scales of different time were analyzed by SAS8.1 statistical package and coefficient correlation between hyperechogenicity areas of target sonograms and necrosis areas was calculated.
     In HIFU with SonoVue group, SonoVue of different concentrations was pumped into hysteromyoma from the 3-way stop cock of peristaltic pump after the pump was turned on. Hysteromyoma planes filled with SonoVue were selected by ultrasound and radiated by HIFU. Radiance parameters, observing indexes, statistical method, postdose treatment were similar to single HIFU group.
     Results 1.After heparin anticoagulant ex vivo human hysteromyoma
     specimens were reperfused, CDFI showed chroma signal filled the periphery of hysteromyoma and occasionally punctiform chroma signals were seen in the hysteromyoma and barred constant speed PW frequency spectrum signals like portal veins were seen. It indicated that reperfusion of hysteromyoma specimens was successful and Ringer lactate solution has been pumped into the inner of hysteromyoma.
     2.Target gray scales were different at different time points after single radiance by HIFU in fixed. The gray scale values were highest 0min after radiance and trended to stable 1min after radiance. The target gray scale values was 29.40±3.44 1min after radiance by HIFU with an acoustic power of 200w, radiance depth of 20 mm and exposure time of 10s. Hyperechogenicity areas of target depressed in a time-dependent manner. The coefficient correlation between hyperechogenicity areas of target sonograms and necrosis areas was high and got highest 2min after radiance, the highest correlation coefficient was 0.99957.
     3.In HIFU associated with SonoVue group, the gray scale values trended stable 2min after radiance. The coefficient correlation between hyperechogenicity areas of target sonograms and necrosis areas got highest at the time point 5min after radiance.
     Conclusion
     1.Reperfusion model of ex vivo hysteromyoma specimens was constructed to imitate the blood circulation of in vivo uterus and provide in vivo environments of basic and clinic research on hysteromyoma.
     2.1min after single radiance by HIFU, the target gray scale values trended stable. The coefficient correlation between hyperechogenicity areas of target sonograms and necrosis areas was highest 2min after radiance.
     3.After radiance by HIFU associated with SonoVue, the target gray scale values needs more time to trended stable and the coefficient correlation between hyperechogenicity areas of target sonograms and necrosis areas was lower.
     4.The target gray scale values increases with the concentration of microbubble.
     5.It needs enough concentration of microbubble to increase the curativeeffect of HIFU.
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