Electrical impedance scanning in breast tumor imaging: correlation with the growth pattern of lesion

Background This study researched the electric impedance properties of breast tissue and demonstrated the differentcharacteristic of electrical impedance scanning (EIS) images.Methods The impedance character of 40 malignant tumors, 34 benign tumors and some normal breast tissue from 69patients undergoing breast surgery was examined by EIS in vivo measurement and mammography screening, with aseries of frequencies set between 100 Hz-100 kHz in the ex vivo spectroscopy measurement.Results Of the 39 patients with 40 malignant tumors, 24 showed bright spots, 11 showed dark areas in EIS and 5showed no specific image. Of the 30 patients with 34 benign tumors there were almost no specific abnormality shown inthe EIS results. Primary ex vivo spectroscopy experiments showed that the resistivity of various breast tissue take thefollowing pattern: adipose tissue＞cancerous tissue＞mammary gland and benign tumor tissue.Conclusions There are significant differences in the electrical impedance properties between cancerous tissue andhealthy tissue. The impedivity of benign tumor is lower, and is at the same level with that of the mammary glandulartissue. The distinct growth pattern of breast lesions determined the different electrical impedance characteristics in theEIS results.     

Electrical impedance scanning in breast tumor imaging: correlation with the growth pattern of lesion

Background This study researched the electric impedance properties of breast tissue and demonstrated the differentcharacteristic of electrical impedance scanning (EIS) images.Methods The impedance character of 40 malignant tumors, 34 benign tumors and some normal breast tissue from 69patients undergoing breast surgery was examined by EIS in vivo measurement and mammography screening, with aseries of frequencies set between 100 Hz-100 kHz in the ex vivo spectroscopy measurement.Results Of the 39 patients with 40 malignant tumors, 24 showed bright spots, 11 showed dark areas in EIS and 5showed no specific image. Of the 30 patients with 34 benign tumors there were almost no specific abnormality shown inthe EIS results. Primary ex vivo spectroscopy experiments showed that the resistivity of various breast tissue take thefollowing pattern: adipose tissue＞cancerous tissue＞mammary gland and benign tumor tissue.Conclusions There are significant differences in the electrical impedance properties between cancerous tissue andhealthy tissue. The impedivity of benign tumor is lower, and is at the same level with that of the mammary glandulartissue. The distinct growth pattern of breast lesions determined the different electrical impedance characteristics in theEIS results.     

Electrical impedance scanning in breast tumor imaging: correlation with the growth pattern of lesion

Background This study researched the electric impedance properties of breast tissue and demonstrated the differentcharacteristic of electrical impedance scanning (EIS) images.Methods The impedance character of 40 malignant tumors, 34 benign tumors and some normal breast tissue from 69patients undergoing breast surgery was examined by EIS in vivo measurement and mammography screening, with aseries of frequencies set between 100 Hz-100 kHz in the ex vivo spectroscopy measurement.Results Of the 39 patients with 40 malignant tumors, 24 showed bright spots, 11 showed dark areas in EIS and 5showed no specific image. Of the 30 patients with 34 benign tumors there were almost no specific abnormality shown inthe EIS results. Primary ex vivo spectroscopy experiments showed that the resistivity of various breast tissue take thefollowing pattern: adipose tissue＞cancerous tissue＞mammary gland and benign tumor tissue.Conclusions There are significant differences in the electrical impedance properties between cancerous tissue andhealthy tissue. The impedivity of benign tumor is lower, and is at the same level with that of the mammary glandulartissue. The distinct growth pattern of breast lesions determined the different electrical impedance characteristics in theEIS results.     

Electrical impedance scanning in breast tumor imaging: correlation with the growth pattern of lesion

Background This study researched the electric impedance properties of breast tissue and demonstrated the differentcharacteristic of electrical impedance scanning (EIS) images.Methods The impedance character of 40 malignant tumors, 34 benign tumors and some normal breast tissue from 69patients undergoing breast surgery was examined by EIS in vivo measurement and mammography screening, with aseries of frequencies set between 100 Hz-100 kHz in the ex vivo spectroscopy measurement.Results Of the 39 patients with 40 malignant tumors, 24 showed bright spots, 11 showed dark areas in EIS and 5showed no specific image. Of the 30 patients with 34 benign tumors there were almost no specific abnormality shown inthe EIS results. Primary ex vivo spectroscopy experiments showed that the resistivity of various breast tissue take thefollowing pattern: adipose tissue＞cancerous tissue＞mammary gland and benign tumor tissue.Conclusions There are significant differences in the electrical impedance properties between cancerous tissue andhealthy tissue. The impedivity of benign tumor is lower, and is at the same level with that of the mammary glandulartissue. The distinct growth pattern of breast lesions determined the different electrical impedance characteristics in theEIS results.     

Electrical impedance scanning in breast tumor imaging: correlation with the growth pattern of lesion

Background This study researched the electric impedance properties of breast tissue and demonstrated the differentcharacteristic of electrical impedance scanning (EIS) images.Methods The impedance character of 40 malignant tumors, 34 benign tumors and some normal breast tissue from 69patients undergoing breast surgery was examined by EIS in vivo measurement and mammography screening, with aseries of frequencies set between 100 Hz-100 kHz in the ex vivo spectroscopy measurement.Results Of the 39 patients with 40 malignant tumors, 24 showed bright spots, 11 showed dark areas in EIS and 5showed no specific image. Of the 30 patients with 34 benign tumors there were almost no specific abnormality shown inthe EIS results. Primary ex vivo spectroscopy experiments showed that the resistivity of various breast tissue take thefollowing pattern: adipose tissue＞cancerous tissue＞mammary gland and benign tumor tissue.Conclusions There are significant differences in the electrical impedance properties between cancerous tissue andhealthy tissue. The impedivity of benign tumor is lower, and is at the same level with that of the mammary glandulartissue. The distinct growth pattern of breast lesions determined the different electrical impedance characteristics in theEIS results.     

Electrical impedance scanning in breast tumor imaging: correlation with the growth pattern of lesion

Background This study researched the electric impedance properties of breast tissue and demonstrated the differentcharacteristic of electrical impedance scanning (EIS) images.Methods The impedance character of 40 malignant tumors, 34 benign tumors and some normal breast tissue from 69patients undergoing breast surgery was examined by EIS in vivo measurement and mammography screening, with aseries of frequencies set between 100 Hz-100 kHz in the ex vivo spectroscopy measurement.Results Of the 39 patients with 40 malignant tumors, 24 showed bright spots, 11 showed dark areas in EIS and 5showed no specific image. Of the 30 patients with 34 benign tumors there were almost no specific abnormality shown inthe EIS results. Primary ex vivo spectroscopy experiments showed that the resistivity of various breast tissue take thefollowing pattern: adipose tissue＞cancerous tissue＞mammary gland and benign tumor tissue.Conclusions There are significant differences in the electrical impedance properties between cancerous tissue andhealthy tissue. The impedivity of benign tumor is lower, and is at the same level with that of the mammary glandulartissue. The distinct growth pattern of breast lesions determined the different electrical impedance characteristics in theEIS results.     

Electrical impedance scanning in breast tumor imaging: correlation with the growth pattern of lesion

Background This study researched the electric impedance properties of breast tissue and demonstrated the differentcharacteristic of electrical impedance scanning (EIS) images.Methods The impedance character of 40 malignant tumors, 34 benign tumors and some normal breast tissue from 69patients undergoing breast surgery was examined by EIS in vivo measurement and mammography screening, with aseries of frequencies set between 100 Hz-100 kHz in the ex vivo spectroscopy measurement.Results Of the 39 patients with 40 malignant tumors, 24 showed bright spots, 11 showed dark areas in EIS and 5showed no specific image. Of the 30 patients with 34 benign tumors there were almost no specific abnormality shown inthe EIS results. Primary ex vivo spectroscopy experiments showed that the resistivity of various breast tissue take thefollowing pattern: adipose tissue＞cancerous tissue＞mammary gland and benign tumor tissue.Conclusions There are significant differences in the electrical impedance properties between cancerous tissue andhealthy tissue. The impedivity of benign tumor is lower, and is at the same level with that of the mammary glandulartissue. The distinct growth pattern of breast lesions determined the different electrical impedance characteristics in theEIS results.     

Electrical impedance scanning in breast tumor imaging: correlation with the growth pattern of lesion

Background This study researched the electric impedance properties of breast tissue and demonstrated the differentcharacteristic of electrical impedance scanning (EIS) images.Methods The impedance character of 40 malignant tumors, 34 benign tumors and some normal breast tissue from 69patients undergoing breast surgery was examined by EIS in vivo measurement and mammography screening, with aseries of frequencies set between 100 Hz-100 kHz in the ex vivo spectroscopy measurement.Results Of the 39 patients with 40 malignant tumors, 24 showed bright spots, 11 showed dark areas in EIS and 5showed no specific image. Of the 30 patients with 34 benign tumors there were almost no specific abnormality shown inthe EIS results. Primary ex vivo spectroscopy experiments showed that the resistivity of various breast tissue take thefollowing pattern: adipose tissue＞cancerous tissue＞mammary gland and benign tumor tissue.Conclusions There are significant differences in the electrical impedance properties between cancerous tissue andhealthy tissue. The impedivity of benign tumor is lower, and is at the same level with that of the mammary glandulartissue. The distinct growth pattern of breast lesions determined the different electrical impedance characteristics in theEIS results.     

Electrical impedance scanning in breast tumor imaging: correlation with the growth pattern of lesion

Background This study researched the electric impedance properties of breast tissue and demonstrated the differentcharacteristic of electrical impedance scanning (EIS) images.Methods The impedance character of 40 malignant tumors, 34 benign tumors and some normal breast tissue from 69patients undergoing breast surgery was examined by EIS in vivo measurement and mammography screening, with aseries of frequencies set between 100 Hz-100 kHz in the ex vivo spectroscopy measurement.Results Of the 39 patients with 40 malignant tumors, 24 showed bright spots, 11 showed dark areas in EIS and 5showed no specific image. Of the 30 patients with 34 benign tumors there were almost no specific abnormality shown inthe EIS results. Primary ex vivo spectroscopy experiments showed that the resistivity of various breast tissue take thefollowing pattern: adipose tissue＞cancerous tissue＞mammary gland and benign tumor tissue.Conclusions There are significant differences in the electrical impedance properties between cancerous tissue andhealthy tissue. The impedivity of benign tumor is lower, and is at the same level with that of the mammary glandulartissue. The distinct growth pattern of breast lesions determined the different electrical impedance characteristics in theEIS results.     

Electrical impedance scanning in breast tumor imaging: correlation with the growth pattern of lesion

Background This study researched the electric impedance properties of breast tissue and demonstrated the differentcharacteristic of electrical impedance scanning (EIS) images.Methods The impedance character of 40 malignant tumors, 34 benign tumors and some normal breast tissue from 69patients undergoing breast surgery was examined by EIS in vivo measurement and mammography screening, with aseries of frequencies set between 100 Hz-100 kHz in the ex vivo spectroscopy measurement.Results Of the 39 patients with 40 malignant tumors, 24 showed bright spots, 11 showed dark areas in EIS and 5showed no specific image. Of the 30 patients with 34 benign tumors there were almost no specific abnormality shown inthe EIS results. Primary ex vivo spectroscopy experiments showed that the resistivity of various breast tissue take thefollowing pattern: adipose tissue＞cancerous tissue＞mammary gland and benign tumor tissue.Conclusions There are significant differences in the electrical impedance properties between cancerous tissue andhealthy tissue. The impedivity of benign tumor is lower, and is at the same level with that of the mammary glandulartissue. The distinct growth pattern of breast lesions determined the different electrical impedance characteristics in theEIS results.     

电阻抗扫描乳腺成像的初步实验

目的: 电阻抗扫描(electrical impedance scanning, EIS)成像原理应用于妇女乳腺检查是一种新的诊断技术. 初步实验研究在于为后续EIS乳腺成像系统电极阵列、硬件系统、软件算法的设计提供依据. 方法: 基于EIS检测原理通过初步建立的信号检测平台,采集一些人体数据,并对信号的幅值、相位进行分析. 结果: 电极阵列、电极-皮肤接触阻抗、激励频率均对检测信号有影响. 结论: 明确了影响EIS检测结果的因素,为EIS乳腺成像系统的设计打下了良好的基础.     

电阻抗扫描成像和高频超声诊断小乳腺癌的对照研究

目的：评价电阻抗扫描成像(electrical impedance scanning，EIS)和高频超声对小乳腺癌的诊断价值．方法：乳腺肿块(直径≤2cm)54例病理证实，行EIS和高频超声检查，时间间隔不超过3d．结果：乳腺癌23例，EIS诊断小乳腺癌17例，敏感性73．9％，特异性80．6％，准确性77．8％，阳性预测值73．9％，阴性预测值80．6％；高频超声诊断小乳腺癌20例，敏感性87．0％，特异性87．1％，准确性87．0％，阳性预测值83．3％，阴性预测值90．0％．二联合诊断，敏感性95．6％，特异性90．3％，准确性92．6％，阳性预测值88．0％，阴性预测值96．6％．结论：EIS对小乳腺癌的诊断有较大实用价值，且与高频超声结合应用，可以提高小乳腺癌的诊断准确奎．     

正常妇女电阻抗扫描乳腺检测数据的初步分析

目的: 研究正常妇女的电阻抗扫描乳腺检测数据的特征,为进一步的成像和判别异常阻抗区域打下基础. 方法: 对191例正常志愿者的电阻抗扫描乳腺检查数据,分别计算其相应的电阻抗实部、虚部、幅值、相位等参数. 使用统计学方法,分析不同个体之间的电阻抗参数的差异程度,比较同一个体左右两侧的一致性,观察不同个体电阻抗参数与年龄、身高、体质量的相关性,分析同一个体不同测量位置和同次测量中不同电极位置的变化规律. 结果: 被测者电阻抗参数的个体差异程度较大,但自体的左右两侧一致性较好. 电阻抗参数与被测者年龄、身高、体质量没有显著相关性. 同一个体不含乳头区的参数基本接近,而含乳头区参数则显著增大. 结论: 不同个体的电阻抗参数不能直接用于判断阻抗的异常变化,但同一个体的左右两侧以及不含乳头区的部位可以相互参照,用于判断阻抗的异常变化. 电阻抗扫描方法可以检测到阻抗的差异.     

自动乳腺全容积成像技术对乳腺肿瘤的鉴别诊断

目的探讨自动乳腺全容积成像(ABVS)系统检查在鉴别乳腺良恶性肿瘤中的临床价值。方法使用西门子Acuson S2000的ABVS系统扫查84例乳腺肿瘤患者的双侧乳腺,获取双侧乳腺横切面图像上的基本数据,系统自动进行三维数据重建,然后获得乳腺冠状面和矢状面图像。与常规二维超声检查相对比,并与术后或穿刺病理结果相对照,评价ABVS系统对乳腺良恶性肿瘤的鉴别诊断价值。结果 ABVS系统诊断的灵敏度为90%,特异度为90%,准确度为90%;常规超声诊断的灵敏度为70%,特异度为90%,准确度为81%。结论 ABVS系统作为一种新的超声检查途径,提高了超声对乳腺良恶性肿瘤鉴别诊断的准确度,为临床提供更加准确、完整的诊断信息。     

Breast magnetic resonance imaging in patients with occult breast carcinoma: evaluation on feasibility and correlation with histopathological findings

Background  As an uncommon presentation, occult primary breast cancer remains a diagnostic and therapeutic challenge in clinical practice. This study aimed to retrospectively assess the feasibility of breast magnetic resonance imaging (MRI) in patients with malignant axillary lymphadenopathy and unknown primary malignancy, and correlation with histopathological characteristics.

Methods  A total of 35 women with occult breast carcinoma were evaluated with dynamic contrast-enhanced breast MRI. Whole seriate section was used in all cases. MRI performance was assessed and correlated with histopathological findings.

Results  Twenty-one of 35 patients were found to have primary breast carcinoma histologically. Twenty of the 21 patients had abnormal MR findings and 1 patient had a normal MRI study. Of the remaining 14 patients, 10 were negative on both MRI and surgery. Four had suspicious enhancement on MRI and no corresponding tumor was found. Lesions with mass enhancement were found in 55% (11/20) and ductual and segmental enhancement in 45%. The average diameter of the primary tumors was 15 mm. Invasive ductal carcinomas were found in 81% (17/21). One of 17 invasive ductual carcinomas was too small to be graded. Fourteen of the remaining 16 were classified as grade II and 2 as grade I. Thirty-two of the 35 patients had received estrogen receptor, progesterone receptor and human epidermal growth factor receptor 2 examinations and the 12 of 32 were triple-negative breast carcinoma.

Conclusions  Mass lesions with small size and lesions with ductal or segment enhancement are common MRI features in patients with occult breast cancer. The dominant types of primary tumors are invasive ductal carcinoma with moderate histopathological grade. The rate of triple-negative breast carcinoma may be higher in occult breast cancer.

     

基于电阻抗扫描成像的乳腺癌新辅助化疗疗效评价的仿真研究

目的研究乳腺癌新辅助化疗期间,乳腺电阻抗扫描(Electrical Impedance Scanning,EIS)成像系统检测乳腺癌组织变化的能力。方法构建精细化乳腺电阻抗仿真模型,分析新辅助化疗期间EIS系统检测癌组织尺寸和电导率变化的能力,并对仿真数据进行曲线拟合得到对应的回归方程,最终得到衡量EIS系统检测癌组织变化的指标。结果EIS系统检测癌组织变化的能力与癌组织的长径和电导率变化均呈线性关系。当EIS系统检测阈值为0.05时,EIS系统可检测到的癌组织长径的最小变化量为2.17 mm,癌组织电导率的最小变化量为0.78 S/m。结论EIS系统能够实现对癌组织尺寸和电导率变化的敏感检测,仿真结果可为EIS应用于乳腺癌新辅助化疗疗效评价提供理论指导。     

生物电阻抗测试频率对乳腺癌相关淋巴水肿定量评估的影响

目的 本研究通过对乳腺癌相关淋巴水肿患侧上肢不同频率生物电阻抗值的检测,分析生物电阻抗测试频率对淋巴水肿定量评估的影响,为生物电阻抗技术定量评估乳腺癌相关淋巴水肿临床应用提供依据。方法 选取乳腺癌相关淋巴水肿患者30例,采用多频生物电阻抗人体成分分析仪,检测受试者双上肢不同频率生物电阻值。比较健侧和患侧上肢平均周径、生物电阻抗值的差异,对双上肢平均周径差和不同频率阻抗差进行相关性分析。结果 （1）受试者患侧上肢周径和不同频率下阻抗值与健侧比较,差异有统计学意义（P<0.05）;（2）患侧和健侧上肢平均周径差与50 kHz下的阻抗差呈正相关（r=0.453,P=0.023）,低频率的生物电阻抗值与传统周径测量法的一致性好;（3）患侧50 kHz频率阻抗值较健侧阻抗值增加百分比显著高于肢体周径增加百分比（P<0.01）。结论 低频生物电阻抗值在淋巴水肿定量评估中有重要的应用价值。     

钼靶下导丝定位活检在诊断触诊阴性乳腺病灶中的应用

目的：探讨钼靶下导丝定位活检技术对触诊阴性乳腺可疑病灶的诊断价值。方法：选取52例钼靶检查发现可疑病变而临床触诊阴性、彩超无特异发现的乳腺病灶进行钼靶下导丝定位后手术活检并送病理检查。结果：52例患者行钼靶引导下导丝定位均一次操作成功,术后病理报告：恶性病变16例,其中浸润性导管癌7例,导管原位癌6例,导管内癌早期浸润2例,浸润性小叶癌1例;良性病变36例,其中乳腺增生症15例,纤维腺瘤7例,轻～中度非典型增生5例,炎症性病变4例,导管内乳头状瘤3例,乳腺导管扩张症2例。乳腺癌检出率为30．8％,诊断准确率为100％。结论：钼靶下导丝定位乳腺活检定位准确,安全可行,可有效提高不可触及的乳腺病变切除活检的精确性,利于早期乳腺癌的发现。     

声脉冲辐射力成像对乳腺肿瘤的诊断价值

目的：评价声脉冲辐射力成像（ARFI）技术对乳腺良恶性病变的鉴别诊断价值。方法选取84例患者共87个肿块进行常规超声、声触诊组织成像（VTI）及声触诊组织量化（VTQ）检查,得出剪切波速度值,并运用image J软件对VTI图像进行后处理得出肿块的平均光密度值,以病理结果为金标准,绘制受试者工作特征（ROC）曲线,评价ARFI的意义。结果经手术病理证实,87个乳腺肿块中良性病灶56个、恶性病灶31个。恶性病灶V T Q≥3．49 m／s （临界值）的病灶数为21个,＜3．49 m／s为10个。良性病灶V T Q≥3．49 m／s病灶数为3个,＜3．49 m／s为53个。恶性病灶平均光密度值大于或等于202．25（临界值）的病灶数为28个,＜202．25为3个。良性病变平均光密度值大于或等于202．25的病灶数6个,＜202．25为50个。乳腺良恶性病灶VTQ剪切波速度及VTI平均光密度值比较,差异均有统计学意义（P＝0．000）。关于乳腺肿瘤的诊断灵敏度、特异度、阳性预测值、阴性预测值、准确率及约登指数,常规超声分别为96．8％、67．8％、62．5％、97．4％、78．2％、0．645;ARFI分别为93．5％、98．2％、96．7％、96．5％、96．6％、0．917。结论 ARFI成像对乳腺肿瘤诊断的特异度、准确率优于常规超声。     

近红外线扫描与X线摄影在乳腺肿块诊断中的价值

目的探讨乳腺近红外线扫描(infrared light scanning, IFS)与X线摄影(mammography)在乳腺肿块诊断中的价值.方法对313例经手术治疗的乳腺肿块患者行近红外线扫描及X线摄影检查,并分析近红外线扫描与X线摄影在乳腺肿块诊断中与病理结果的符合率.结果对乳腺纤维腺瘤诊断符合率近红外线扫描显著高于X线摄影(P<0.05),对其余肿块无显著差异;二者联合检查可提高诊断符合率,其中对乳腺癌诊断符合率有显著性差异(P<0.05).结论乳腺近红外线扫描在乳腺肿块检查中与X线摄影诊断符合率相似,联合检查可进行互补,提高诊断符合率.