As a noninvasive functional imaging technique, dynamic contrast-enhanced magnetic resonance imaging(DCEMRI) is being used in oncology to measure properties of tumor microvascular structure and permeability. Studies ha...As a noninvasive functional imaging technique, dynamic contrast-enhanced magnetic resonance imaging(DCEMRI) is being used in oncology to measure properties of tumor microvascular structure and permeability. Studies have shown that parameters derived from certain pharmacokinetic models can be used as imaging biomarkers for tumor treatment response. The use of DCE-MRI for quantitative and objective assessment of radiation therapy has been explored in a variety of methods and tumor types. However, due to the complexity in imaging technology and divergent outcomes from different pharmacokinetic approaches, the method of using DCE-MRI in treatment assessment has yet to be standardized, especially for breast cancer. This article reviews the basic principles of breast DCE-MRI and recent studies using DCE-MRI in treatment assessment. Technical and clinical considerations are emphasized with specific attention to assessment of radiation treatment response.展开更多
Objective The aim of the study was to further explore the diagnostic value of breast dynamic contrast enhancement (DCE), and improve specificity of breast cancer diagnosis.
Background Earlier studies have examined the association between the diameter of primary tumors measured by magnetic resonance imaging （MRI） and histopathology in breast cancer patients. However, the diameter does n...Background Earlier studies have examined the association between the diameter of primary tumors measured by magnetic resonance imaging （MRI） and histopathology in breast cancer patients. However, the diameter does not completely describe the dimensions of the breast tumor or its volumetric proportion relative to the whole breast. The association between breast tumor volume/breast volume ratios measured by these two techniques has not been reported.展开更多
Objective/Background: Qualitative assessment of uncertain (type II) time-intensity curves (TICs) in breast DCE-MRI is problematic and operator dependent. The aim of this work is to evaluate if a semi-quantitative asse...Objective/Background: Qualitative assessment of uncertain (type II) time-intensity curves (TICs) in breast DCE-MRI is problematic and operator dependent. The aim of this work is to evaluate if a semi-quantitative assessment of uncertain TICs could improve overall diagnostic performance. Methods: In this study 49 lesions from 44 patients were retrospectively analysed. Per each lesion one region-of-interest (ROI)- averaged TIC was qualitatively evaluated by two radiologists in consensus: all the ROIs resulted in type II (uncertain) TIC. The same TICs were semi-quantitatively re-classified on the basis of the difference between the signal intensities of the last-time-point and of the peak: this difference was classified according to two different cut-off ranges (±5% and ±3%). All patients were cytological or histological biopsy proven. Fisher test and McNemar test were performed to evaluate if results were statistically significant (p < 0.05). Results: Using ±5% cut-off 16 TICs were reclassified as type III and 12 as type I while 21 were reclassified again as type II. Using ±3% 22 TICs were reclassified as type III and 16 as type I while 11 were reclassified again as type II. The semi-quantitative classification was compared to the histological-cytological results: the sensitivity, specificity, positive and negative predictive values obtained with ±3% were 77%, 91%, 91% and 78% respectively while using ±5% were 58%, 96%, 94% and 68% respectively. Using the ±5% cut-off 26/28 (93%) TICs were correctly reclassified while using the ±3% cut-off 34/38 (90%) TICs were correctly reclassified (p < 0.05). Conclusions: Semi-quantitative methods in kinetic curve assessment on DCE-MRI could improve classification of qualitatively uncertain TICs, leading to a more accurate classification of suspicious breast lesions.展开更多
目的:探讨磁共振动态对比增强成像(Dynamic contrast-enhanced MRI,DCE-MRI)、弥散加权成像(Diffusion weighted imaging,DWI)联合检查对三阴型乳腺癌的诊断价值.方法:选取128例我院2020年7月至2022年7月就诊的乳腺癌患者作为研究对象....目的:探讨磁共振动态对比增强成像(Dynamic contrast-enhanced MRI,DCE-MRI)、弥散加权成像(Diffusion weighted imaging,DWI)联合检查对三阴型乳腺癌的诊断价值.方法:选取128例我院2020年7月至2022年7月就诊的乳腺癌患者作为研究对象.以手术或病理活检结果为"金标准",将患者分为三阴型乳腺癌组(52例)和非三阴型乳腺癌组(76例).两组入院后均行DCE-MRI、DWI检查,比较两组DCE-MRI、DWI检查定量参数[容量转移常数(Volume transfer constant,Ktrans)、速率常数(Rate constant,Kep)、血管外细胞外间隙容积比(Volume of extracellular space per unit volume of tissue,Ve)]及表观扩散系数(Apparent diffusion coefficient,ADC).统计比较DCE-MRI、DWI单独、联合检查对三阴型乳腺癌的诊断结果、诊断效能,并分析DCE-MRI、DWI单独、联合检查对乳腺癌分期的评估价值.结果:与非三阴型乳腺癌组比较,三阴型乳腺癌组Kep较高,Ve、ADC较低(P<0.05);DCE-MRI、DWI联合诊断阳性患者数量高于单一检测;与DCE-MRI、DWI单独诊断相比,二者联合诊断对于三阴型乳腺癌诊断灵敏度、准确度较高,漏诊率较低(P<0.05);DCE-MRI、DWI联合分期诊断结果与手术或病理活检分期诊断结果一致性Kappa值大于单一方案诊断,具有较高一致性.结论:DCE-MRI、DWI联合检测可提高诊断准确度、灵敏度,降低漏诊率,诊断效能较高.展开更多
文摘As a noninvasive functional imaging technique, dynamic contrast-enhanced magnetic resonance imaging(DCEMRI) is being used in oncology to measure properties of tumor microvascular structure and permeability. Studies have shown that parameters derived from certain pharmacokinetic models can be used as imaging biomarkers for tumor treatment response. The use of DCE-MRI for quantitative and objective assessment of radiation therapy has been explored in a variety of methods and tumor types. However, due to the complexity in imaging technology and divergent outcomes from different pharmacokinetic approaches, the method of using DCE-MRI in treatment assessment has yet to be standardized, especially for breast cancer. This article reviews the basic principles of breast DCE-MRI and recent studies using DCE-MRI in treatment assessment. Technical and clinical considerations are emphasized with specific attention to assessment of radiation treatment response.
基金Supported by the grant from Guangdong Province Social Development Project (No. 2010133)
文摘Objective The aim of the study was to further explore the diagnostic value of breast dynamic contrast enhancement (DCE), and improve specificity of breast cancer diagnosis.
文摘Background Earlier studies have examined the association between the diameter of primary tumors measured by magnetic resonance imaging （MRI） and histopathology in breast cancer patients. However, the diameter does not completely describe the dimensions of the breast tumor or its volumetric proportion relative to the whole breast. The association between breast tumor volume/breast volume ratios measured by these two techniques has not been reported.
文摘Objective/Background: Qualitative assessment of uncertain (type II) time-intensity curves (TICs) in breast DCE-MRI is problematic and operator dependent. The aim of this work is to evaluate if a semi-quantitative assessment of uncertain TICs could improve overall diagnostic performance. Methods: In this study 49 lesions from 44 patients were retrospectively analysed. Per each lesion one region-of-interest (ROI)- averaged TIC was qualitatively evaluated by two radiologists in consensus: all the ROIs resulted in type II (uncertain) TIC. The same TICs were semi-quantitatively re-classified on the basis of the difference between the signal intensities of the last-time-point and of the peak: this difference was classified according to two different cut-off ranges (±5% and ±3%). All patients were cytological or histological biopsy proven. Fisher test and McNemar test were performed to evaluate if results were statistically significant (p < 0.05). Results: Using ±5% cut-off 16 TICs were reclassified as type III and 12 as type I while 21 were reclassified again as type II. Using ±3% 22 TICs were reclassified as type III and 16 as type I while 11 were reclassified again as type II. The semi-quantitative classification was compared to the histological-cytological results: the sensitivity, specificity, positive and negative predictive values obtained with ±3% were 77%, 91%, 91% and 78% respectively while using ±5% were 58%, 96%, 94% and 68% respectively. Using the ±5% cut-off 26/28 (93%) TICs were correctly reclassified while using the ±3% cut-off 34/38 (90%) TICs were correctly reclassified (p < 0.05). Conclusions: Semi-quantitative methods in kinetic curve assessment on DCE-MRI could improve classification of qualitatively uncertain TICs, leading to a more accurate classification of suspicious breast lesions.
文摘目的:探讨磁共振动态对比增强成像(Dynamic contrast-enhanced MRI,DCE-MRI)、弥散加权成像(Diffusion weighted imaging,DWI)联合检查对三阴型乳腺癌的诊断价值.方法:选取128例我院2020年7月至2022年7月就诊的乳腺癌患者作为研究对象.以手术或病理活检结果为"金标准",将患者分为三阴型乳腺癌组(52例)和非三阴型乳腺癌组(76例).两组入院后均行DCE-MRI、DWI检查,比较两组DCE-MRI、DWI检查定量参数[容量转移常数(Volume transfer constant,Ktrans)、速率常数(Rate constant,Kep)、血管外细胞外间隙容积比(Volume of extracellular space per unit volume of tissue,Ve)]及表观扩散系数(Apparent diffusion coefficient,ADC).统计比较DCE-MRI、DWI单独、联合检查对三阴型乳腺癌的诊断结果、诊断效能,并分析DCE-MRI、DWI单独、联合检查对乳腺癌分期的评估价值.结果:与非三阴型乳腺癌组比较,三阴型乳腺癌组Kep较高,Ve、ADC较低(P<0.05);DCE-MRI、DWI联合诊断阳性患者数量高于单一检测;与DCE-MRI、DWI单独诊断相比,二者联合诊断对于三阴型乳腺癌诊断灵敏度、准确度较高,漏诊率较低(P<0.05);DCE-MRI、DWI联合分期诊断结果与手术或病理活检分期诊断结果一致性Kappa值大于单一方案诊断,具有较高一致性.结论:DCE-MRI、DWI联合检测可提高诊断准确度、灵敏度,降低漏诊率,诊断效能较高.
