目的探讨孤立性肺结节(SPN)多层螺旋CT(MSCT)灌注成像与血管生成的关系。方法对34例SPN行MSCT动态增强(以4 m l/s的流率注入对比剂)。记录SPN增强前后各时相的CT值,并计算强化值(PHSPN)、灌注量(P)、结节-主动脉强化值比(PHSPN/PHAA)。...目的探讨孤立性肺结节(SPN)多层螺旋CT(MSCT)灌注成像与血管生成的关系。方法对34例SPN行MSCT动态增强(以4 m l/s的流率注入对比剂)。记录SPN增强前后各时相的CT值,并计算强化值(PHSPN)、灌注量(P)、结节-主动脉强化值比(PHSPN/PHAA)。利用免疫组织化学测定微血管密度(MVD)并标定血管内皮生长因子(VEGF),评价SPN CT灌注各参数与MVD和VEGF的相关性。结果PHSPN值恶性结节[(96.15±11.55)HU]和炎症性结节[(101.15±8.41)HU]较良性结节[(47.24±9.15)HU]有更高的强化峰值(F=72.730、9.728,P值均<0.001);PHSPN/PHAA比值恶性和炎性结节较良性结节差异有统计学意义(F=87.51、8.20,P值均<0.001)。而恶性结节与炎症性结节的PHSPN值和PHSPN/PHAA比值差异均无统计学意义(P>0.05)。炎性SPN增强前密度明显低于恶性SPN(χ2=8.49,P<0.05)。恶性SPN与炎症性SPN的灌注量明显高于良性SPN(F=103.15、16.88,P值均<0.01)。VEGF阳性表达17例(恶性SPN 16例,良性SPN 1例),MVD计数恶性SPN[(36.88±6.76)条/视野]明显高于良性[(4.51±0.60)条/视野]和炎性[(26.11±5.43)条/视野]SPN(F=91.31、9.39,P值均<0.001)。CT灌注各参数PHSPN、P、PHSPN/PHAA比值,与恶性和良性MVD呈正相关,其中以恶性结节PHSPN与MVD相关性最强(r=0.657,P<0.05)。结论SPN的微血管密度和VEGF表达是其在CT灌注上不同表现的病理生理学基础,SPNCT灌注特点与其血管生成有良好的相关性。展开更多
Background The solitary pulmonary nodule （SPN） is one of the most common findings on chest radiographs. The objectives of clinical practice are to differentiate malignant nodules from benign nodules in the least inv...Background The solitary pulmonary nodule （SPN） is one of the most common findings on chest radiographs. The objectives of clinical practice are to differentiate malignant nodules from benign nodules in the least invasive way and to make a specific diagnosis. This study was aimed to evaluate the correlation between perfusion imaging features and microvessel density （MVD） and vascular endothelial growth factors （VEGF） in SPNs using multi-slice computed tomography （MSCT）; and to provide the theoretical basis for SPN blood flow pattern and blood flow quantitative features. Also, the study called for the discussion of the method＇s clinical application value in the differential diagnosis of benign and malignant SPNs.Methods Sixty-eight patients with SPN underwent multi-location dynamic contrast enhanced （nonionic contrast material was administrated via the antecubital vein at a rate of 4 ml/s） MSCT. Precontrast and postcontrast attenuations on every scan was studied. Perfusion, peak height, and the ratio of the peak height of the SPN to that of the aorta were analyzed. Perfusion was calculated using the maximum gradient of the time-density curves （TDC） and the peak height of the aorta. The quantitative parameters （perfusion, peak height, ratio of peak height of the SPN to that of the aorta） of the blood flow pattern were compared with MVD and the VEGF expression of immunohistochemistry. Results The perfusion peak heights of malignant （（96.15±11.55） HU） and inflammatory （（101.15±8.41） HU） SPNs were significantly higher than those of benign （（47.24±9.15） HU） SPNs （P 〈0.05, P 〈0.05）. Ratios of SPN-to-aorta of malignant and inflammatory SPNs were significantly higher than those of benign SPNs （P 〈0.05, P 〈0.05）. No significant differences were found between the peak height and SPN-to-aorta ratio of malignant SPNs and inflammatory SPNs （P 〉0.05, P 〉0.05）. The precontrast densities of inflammatory SPNs were lower than those of malignant SPNs （展开更多
Background Hemangiopericytomas （HPCs） have a relentless tendency for local recurrence and metastases,differentiating between benign meningiomas and HPCs before surgery is important for both treatment planning and th...Background Hemangiopericytomas （HPCs） have a relentless tendency for local recurrence and metastases,differentiating between benign meningiomas and HPCs before surgery is important for both treatment planning and the prognosis appraisal.The purpose of this study was to evaluate the correlations between CT perfusion parameters and microvessel density （MVD） in extra-axial tumors and the possible role of CT perfusion imaging in preoperatively differentiating benign meningiomas and HPCs.Methods Seventeen patients with benign meningiomas and peritumoral edema, 12 patients with HPCs and peritumoral edema underwent 64-slice CT perfusion imaging pre-operation.Perfusion was calculated using the Patlak method.The quantitative parameters, include cerebral blood volume （CBV）, permeability surface （PS） of parenchyma, peritumoral edema among benign meningiomas and HPCs were compared respectively.CBV and PS in parenchyma, peritumoral edema of benign meningiomas and HPCs were also compared to that of the contrallateral normal white matter respectively.The correlations between CBV, PS of tumoral parenchyma and MVD were examined.Results The value of CBV and PS in parenchyma of HPCs were significantly higher than that of benign meningiomas （P〈0.05）, while the values of CBV and PS in peritumoral edema of benign meningiomas and HPCs were not significantly different （P 〉0.05）.MVD in parenchyma of HPCs were significantly higher than that of benign meningiomas （P〈0.05）.There were positive correlations between CBV and MVD （r=0.648, P〈0.05）, PS and MVD （r=0.541, P〈0.05） respectively.Furthermore, the value of CBV and PS in parenchyma of benign meningiomas and HPCs were significantly higher than that of contrallateral normal white matter （P〈0.05）, the value of CBV in peritumoral edema of benign meningiomas and HPCs were significantly lower than that of contrallateral normal white matter （P〈0.05）, while the value of PS in peritumoral edema of benign meningiomas and HPCs were not signi展开更多
文摘Background The solitary pulmonary nodule （SPN） is one of the most common findings on chest radiographs. The objectives of clinical practice are to differentiate malignant nodules from benign nodules in the least invasive way and to make a specific diagnosis. This study was aimed to evaluate the correlation between perfusion imaging features and microvessel density （MVD） and vascular endothelial growth factors （VEGF） in SPNs using multi-slice computed tomography （MSCT）; and to provide the theoretical basis for SPN blood flow pattern and blood flow quantitative features. Also, the study called for the discussion of the method＇s clinical application value in the differential diagnosis of benign and malignant SPNs.Methods Sixty-eight patients with SPN underwent multi-location dynamic contrast enhanced （nonionic contrast material was administrated via the antecubital vein at a rate of 4 ml/s） MSCT. Precontrast and postcontrast attenuations on every scan was studied. Perfusion, peak height, and the ratio of the peak height of the SPN to that of the aorta were analyzed. Perfusion was calculated using the maximum gradient of the time-density curves （TDC） and the peak height of the aorta. The quantitative parameters （perfusion, peak height, ratio of peak height of the SPN to that of the aorta） of the blood flow pattern were compared with MVD and the VEGF expression of immunohistochemistry. Results The perfusion peak heights of malignant （（96.15±11.55） HU） and inflammatory （（101.15±8.41） HU） SPNs were significantly higher than those of benign （（47.24±9.15） HU） SPNs （P 〈0.05, P 〈0.05）. Ratios of SPN-to-aorta of malignant and inflammatory SPNs were significantly higher than those of benign SPNs （P 〈0.05, P 〈0.05）. No significant differences were found between the peak height and SPN-to-aorta ratio of malignant SPNs and inflammatory SPNs （P 〉0.05, P 〉0.05）. The precontrast densities of inflammatory SPNs were lower than those of malignant SPNs （
文摘Background Hemangiopericytomas （HPCs） have a relentless tendency for local recurrence and metastases,differentiating between benign meningiomas and HPCs before surgery is important for both treatment planning and the prognosis appraisal.The purpose of this study was to evaluate the correlations between CT perfusion parameters and microvessel density （MVD） in extra-axial tumors and the possible role of CT perfusion imaging in preoperatively differentiating benign meningiomas and HPCs.Methods Seventeen patients with benign meningiomas and peritumoral edema, 12 patients with HPCs and peritumoral edema underwent 64-slice CT perfusion imaging pre-operation.Perfusion was calculated using the Patlak method.The quantitative parameters, include cerebral blood volume （CBV）, permeability surface （PS） of parenchyma, peritumoral edema among benign meningiomas and HPCs were compared respectively.CBV and PS in parenchyma, peritumoral edema of benign meningiomas and HPCs were also compared to that of the contrallateral normal white matter respectively.The correlations between CBV, PS of tumoral parenchyma and MVD were examined.Results The value of CBV and PS in parenchyma of HPCs were significantly higher than that of benign meningiomas （P〈0.05）, while the values of CBV and PS in peritumoral edema of benign meningiomas and HPCs were not significantly different （P 〉0.05）.MVD in parenchyma of HPCs were significantly higher than that of benign meningiomas （P〈0.05）.There were positive correlations between CBV and MVD （r=0.648, P〈0.05）, PS and MVD （r=0.541, P〈0.05） respectively.Furthermore, the value of CBV and PS in parenchyma of benign meningiomas and HPCs were significantly higher than that of contrallateral normal white matter （P〈0.05）, the value of CBV in peritumoral edema of benign meningiomas and HPCs were significantly lower than that of contrallateral normal white matter （P〈0.05）, while the value of PS in peritumoral edema of benign meningiomas and HPCs were not signi
