胰腺低劑量容積灌注CT的相關(guān)研究
[Abstract]:Objective: To evaluate the reliability and image quality of low dose pancreatic perfusion CT perfusion parameters. Materials and methods: This study was approved by the ethics committee and signed written informed consent before the examination. 100 patients with low dose pancreatic perfusion suspected to be suspected of pancreatic space occupancy were enrolled in the study. The following 5 groups were used. Combined form: A group, tube voltage 80Kv, tube current 120mAs (weight > 80Kg); B group, tube voltage 80Kv, tube current 100mAs (weight > 70Kg); C group, tube voltage 70Kv, tube current 189mAs (weight > 60Kg); group, tube voltage, tube current (weight >); tube current, tube voltage, tube current (weight). Recorded by 1 experienced radiologists. Dose parameters CDTI and DLP, and use deconvolution method to measure perfusion parameters, including blood flow (blood flow, BF), blood volume (blood volume, BV) and osmosis (permeability, PMB). Choose the plain scan, arterial, portal phase images, evaluate the image quality of the perfusion image, including the subjective image quality score and the objective image quality parameters (image background). Noise, signal to noise ratio, contrast to noise ratio). Comparison of the image quality and perfusion parameters of the single factor ANOVA analysis. Results: compared with the conventional group (80Kv, 150mAs), the radiation dose of each group was lower than that of the conventional group (80Kv, 150mAs). The image quality of the low dose group of A-D was equal (P0.05), and the image quality of the group E was higher than that of the other low dose group (P0.05). There was no significant difference in the perfusion parameters of the normal pancreatic substance BF, BV and PMB, and the P values were all greater than the 0.05. conclusion: low dose pancreatic volume perfusion could effectively reduce the radiation dose on the premise of ensuring the quality of the image. The perfusion parameters of the normal pancreatic substance were true and reliable. Objective: To evaluate the low dose perfusion CT image data. The image quality of three-dimensional reconstruction. Materials and methods: the research object was the low dose pancreatic perfusion scan patients collected in the first part of the paper. According to the time density curve of the perfusion formation, the abdominal aorta was selected and the three dimensional reconstruction image was performed at the best time of the portal backbone strengthening, and the 3D reconstruction including volume rendering technique, V RT) and the maximum density projection (Maximum intensity projection, MIP), perfusion and multiphase enhanced arterial phase, VRT reconstruction, perfusion and multiphase portal phase of MIP reconstruction, subjective and objective evaluation of the images by 2 radiologists (background noise, signal to noise ratio), and non parametric test of paired samples to compare perfusion data and more Results: the image quality of the three dimensional reconstruction was enhanced. Results: the VRT and MIP images of the perfusion were better than the conventional multiphase enhancement, but the image noise was higher than the conventional enhancement, but there was no significant difference in the image quality. There was no significant difference in the overall image quality of both VRT and MIP. Conclusion: according to the time density curve of perfusion. The selected perfusion image can replace the three-dimensional reconstruction of the routine multiphase enhanced image. Objective: To investigate the preoperative pathological classification of pancreatic neuroendocrine tumor (G1, G2, G3) by perfusion CT perfusion parameters. Materials and methods: retrospective analysis from December 2015 to February 2017 in Peking Union Medical College Hospital was suspected as the pancreatic neuroendocrinology. 77 patients were treated with CT, including 37 cases of pancreatic neuroendocrine tumor (pancreatic neuroendocrine tumors, pNETs) in our hospital, of which 19 cases were G1 grade, 17 cases of G2 grade, 1 cases of G3 grade, and G1-G3 grade tumors were divided into A, B two, A group was grade tumor, and all patients were labeled. Quasi pancreatic perfusion scan. 1 experienced radiologists measured and recorded perfusion parameters of tumor and normal pancreatic parenchyma on a SIEMENS post processing workstation: blood flow (blood flow, BF), blood volume (blood volume, BV), permeability (permeability, PMB), and the measured results were expressed with mean standard deviation. Analysis of correlation and analysis of the difference in perfusion parameters between A and B two groups by independent sample T test. And draw the work characteristic curve of the subjects (Receiver operating characteristic curve, R0C). 174) and there was a significant difference in G1 (p=0.000), and there was no significant difference in the G2/3 level (p=0.763).Spearman analysis showed that there was no correlation between the perfusion parameters of A, B two, PMB and tumor pathological grading (r=-0.230, P=0.177; p=0.000), and the lower the value, the higher the pathological grade. The independent sample T test showed that the perfusion parameters of A, B two were BF, PMB had no significant difference (P=0.155, P=0.646), but there was a significant difference in BV (P=0.023), the BV value of the patients in the.B group was significantly lower than that of the A group. .0%, the specificity is 77.8%. conclusion: the pathological classification of pancreatic neuroendocrine tumor is different, there is a significant difference between the perfusion parameters BV and the negative correlation between the BV value and the tumor classification. The BV value can identify the pathological grade of the pancreatic neuroendocrine tumor before operation, and the lower the BV value, the higher the pathological grade.
【學(xué)位授予單位】:北京協(xié)和醫(yī)學(xué)院
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:R816.5
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