目的:探究SOMATOM Force 双源CT冠状动脉造影(DSCTCA)对冠心病患者冠状动脉狭窄的诊断价值。方法:选取2017年1月—2019年12月期间收治的疑似冠心病患者80例,均接受DSCTCA、CAG(冠状动脉造影)诊断,以CAG诊断结构为金标准,评价DSCTA的诊...目的:探究SOMATOM Force 双源CT冠状动脉造影(DSCTCA)对冠心病患者冠状动脉狭窄的诊断价值。方法:选取2017年1月—2019年12月期间收治的疑似冠心病患者80例,均接受DSCTCA、CAG(冠状动脉造影)诊断,以CAG诊断结构为金标准,评价DSCTA的诊断价值。结果:共计312支冠状动脉,其中CAG诊断:无狭窄、轻度狭窄、中度狭窄、重度狭窄分别为147支、75支、56支、34支。DSCTCA诊断显示的支数分别为148、76、56、32支。两种诊断方式下冠脉狭窄程度情况对比,无显著差异(P>0.05)。其中CAG诊断:中重度狭窄90支、轻度狭窄或无狭窄222支。DSCTCA诊断:中重度狭窄88支,轻度狭窄224支。两种诊断方式下中重度狭窄情况比较,无显著差异(P>0.05)。DSCTCA诊断的敏感度为94.44%(85/90),特异度为98.65%(219/222),准确度为96.59%(85/88)。SAP(稳定型心绞痛)患者粥样硬化斑块的CT值(86.49±20.15)Hu;ACS(急性冠状动脉综合征)患者粥样硬化斑块的CT值(421.53±106.74)Hu,组间对比,差异显著(t=13.126,P=0.000)。结论:应用SOMATOM Force双源CT冠状动脉造影检查冠心病,其敏感度、特异度、准确度与CAG相当,二者在中重度冠状动脉狭窄诊断上一致性较高,值得临床推广应用。展开更多
Despite lots of techniques in improving the heap leaching performance,many constraints on the industrial applications remain.We proposed a correspondingly effective and new idea of introducing forced aeration to impro...Despite lots of techniques in improving the heap leaching performance,many constraints on the industrial applications remain.We proposed a correspondingly effective and new idea of introducing forced aeration to improve the bad permeability and leaching effect of Yangla Copper Mine(YCM)during heap leaching.The dual-media theory was employed to study the impact mechanism of forced aeration on the variations of porous and fractured media during the column leaching experiments.An X-Ray Computed Tomography(CT)set was utilized to perform the pore imaging of the specimens and the fracture morphology of the particles within the columns was analyzed by Scanning Electron Microscope(SEM)as aeration rate(AR)changed.The results show that there exists copious fine particles within the heap of YCM,the particle size distribution of which is not reasonable.The forced aeration can not only promote the development of the porous and fractured structures but effectively break the blocked seepage paths.Then the leaching degree is improved and the seepage performance of the solute within the solution is enhanced.Therefore,the forced aeration is probable of making the leaching performance greatly improved.展开更多
Objective: On the premise that the image quality meets the requirements of clinical diagnosis, we explored the methods to reduce the radiation dose of coronary artery imaging with Dual-Source CT (DSCT). Methods: We ra...Objective: On the premise that the image quality meets the requirements of clinical diagnosis, we explored the methods to reduce the radiation dose of coronary artery imaging with Dual-Source CT (DSCT). Methods: We randomly selected 200 patients with coronary heat disease (BIM 0.05). The average image noise in group A is (41.76 ± 7.98) HU, in group B the average image noise is (43.97 ± 3.88) HU, the dif- ference between the two groups was not statistically significant (P>0.05). The average CTDIvol of group A and B were (20.63 ± 2.24) mGy, (38.11 ± 10.69) mGy, respectively, then P <0.01. The average DLP of group A and B are (235.75 ± 28.64) mGycm and (492.59 ± 125.49) mGycm respectively, then P <0.01, the dif- ference of radiation dose had statistical significance (P<0.05). Conclusions: For coronary artery imaging with DSCT the heart electric pulse (AUTO) regulation technology can meet the diagnostic requirements and effectively reduce the radiation dose.展开更多
Objective: To compare and analyze the image quality and radiation dose of three scanning modes of dual-source CT coronary artery retrospectively, and to discuss the application value of TurboFlash coarse pitch scannin...Objective: To compare and analyze the image quality and radiation dose of three scanning modes of dual-source CT coronary artery retrospectively, and to discuss the application value of TurboFlash coarse pitch scanning mode. Methods: The imaging data of 100 patients who underwent CT coronary angiography (CCTA) using Siemens force CT retrospective gated triggering spiral scan (RES-SPIRAL), adaptive prospective gated triggering sequence scan (SEQ) and prospective coarse pitch scan (TurboFlash) retrospectively was collected. The image quality was evaluated by objective and subjective methods. The effective radiation dose of patients was compared and analyzed, and the indications of the three scanning modes were analyzed. The application value of dual-source CT TurboFlash coarse pitch scanning in coronary artery imaging was evaluated. Results: The results showed that the left main coronary artery, the right coronary artery and their tertiary branches could be clearly displayed in the three groups of images: the left anterior descending branch, the left circumflex branch, and their three-level branches. There was no statistical difference in subjective image quality among the three groups of pictures (P > 0.05). There was no statistical difference in objective evaluation indexes, such as CT value, SNR, CNR and Noise among the three groups (P > 0.05). The patient radiation dose results showed that the effective radiation dose ED of RES-SPIRA scan was (9.22 ± 1.33) mSv. The dose of SEQ was (2.88 ± 2.47) mSv, and the dose of TurboFlash was (0.51 ± 0.16) mSv. There was significant difference in comparison of the three groups (P 0.05). RES-spiral scanning had the highest radiation dose and TurboFlash coarse pitch scanning (TurboFlash) had the lowest radiation dose. Conclusion: TurboFlash coarse pitch scanning is low in dosage, fast in speed and wide in adaptability. It is especially suitable for the elderly, children, coma and other patients who cannot cooperate with breath-holding examination, as well as for the screening and examination of coronary artery diseases in asymptomatic population. Undoubtedly, it is a worthy method of heart coronary artery examination.展开更多
Objective: to analyze the value of brand A dual-source CT scan in the differential diagnosis of lung cancer. Methods: 40 suspected cases of lung cancer admitted to our hospital from July 2021 to January 2022 were all ...Objective: to analyze the value of brand A dual-source CT scan in the differential diagnosis of lung cancer. Methods: 40 suspected cases of lung cancer admitted to our hospital from July 2021 to January 2022 were all examined by brand A dual-source CT scan. At the same time, the results of surgical pathological biopsy were analyzed to evaluate the value of the former in the differential diagnosis of lung cancer. Results: the 40 cases of suspected lung cancer were confirmed by surgical biopsy, and the remaining 10 cases were benign lesions, including 25 of 30 were adenocarcinoma and 5 squamous carcinoma. The diagnosis of the cases in this group of bisource CT suggested that 28 patients had lung cancer, and the remaining 12 patients were benign lesions, of which 25 patients had confirmed adenocarcinoma and 5 patients had squamous carcinoma. Using surgical pathological biopsy results as the reference standard, dual-source CT was 90.00% specific, 96.67% sensitive and 95.00% accurate;Overlay arterial and standardized iodine venous phase were lower than benign patients (P < 0.05), including Overlay venous, aortic iodine and benign patients (P> 0.05). Conclusion: the accuracy, specificity and sensitivity of brand A dual-source CT scan applied in the differential diagnosis of lung cancer are relatively high, among which Overlay arterial stage and standardized iodine concentration venous stage can be used as practical indicators of disease identification.展开更多
文摘目的:探究SOMATOM Force 双源CT冠状动脉造影(DSCTCA)对冠心病患者冠状动脉狭窄的诊断价值。方法:选取2017年1月—2019年12月期间收治的疑似冠心病患者80例,均接受DSCTCA、CAG(冠状动脉造影)诊断,以CAG诊断结构为金标准,评价DSCTA的诊断价值。结果:共计312支冠状动脉,其中CAG诊断:无狭窄、轻度狭窄、中度狭窄、重度狭窄分别为147支、75支、56支、34支。DSCTCA诊断显示的支数分别为148、76、56、32支。两种诊断方式下冠脉狭窄程度情况对比,无显著差异(P>0.05)。其中CAG诊断:中重度狭窄90支、轻度狭窄或无狭窄222支。DSCTCA诊断:中重度狭窄88支,轻度狭窄224支。两种诊断方式下中重度狭窄情况比较,无显著差异(P>0.05)。DSCTCA诊断的敏感度为94.44%(85/90),特异度为98.65%(219/222),准确度为96.59%(85/88)。SAP(稳定型心绞痛)患者粥样硬化斑块的CT值(86.49±20.15)Hu;ACS(急性冠状动脉综合征)患者粥样硬化斑块的CT值(421.53±106.74)Hu,组间对比,差异显著(t=13.126,P=0.000)。结论:应用SOMATOM Force双源CT冠状动脉造影检查冠心病,其敏感度、特异度、准确度与CAG相当,二者在中重度冠状动脉狭窄诊断上一致性较高,值得临床推广应用。
基金the National Natural Science Foundation of China(No.51374035)the Foundation for the Author of National Excellent Doctoral Dissertation of PR China(No.201351)the Program for New Century Excellent Talents in University of China(No.NCET-13-0669).
文摘Despite lots of techniques in improving the heap leaching performance,many constraints on the industrial applications remain.We proposed a correspondingly effective and new idea of introducing forced aeration to improve the bad permeability and leaching effect of Yangla Copper Mine(YCM)during heap leaching.The dual-media theory was employed to study the impact mechanism of forced aeration on the variations of porous and fractured media during the column leaching experiments.An X-Ray Computed Tomography(CT)set was utilized to perform the pore imaging of the specimens and the fracture morphology of the particles within the columns was analyzed by Scanning Electron Microscope(SEM)as aeration rate(AR)changed.The results show that there exists copious fine particles within the heap of YCM,the particle size distribution of which is not reasonable.The forced aeration can not only promote the development of the porous and fractured structures but effectively break the blocked seepage paths.Then the leaching degree is improved and the seepage performance of the solute within the solution is enhanced.Therefore,the forced aeration is probable of making the leaching performance greatly improved.
文摘Objective: On the premise that the image quality meets the requirements of clinical diagnosis, we explored the methods to reduce the radiation dose of coronary artery imaging with Dual-Source CT (DSCT). Methods: We randomly selected 200 patients with coronary heat disease (BIM 0.05). The average image noise in group A is (41.76 ± 7.98) HU, in group B the average image noise is (43.97 ± 3.88) HU, the dif- ference between the two groups was not statistically significant (P>0.05). The average CTDIvol of group A and B were (20.63 ± 2.24) mGy, (38.11 ± 10.69) mGy, respectively, then P <0.01. The average DLP of group A and B are (235.75 ± 28.64) mGycm and (492.59 ± 125.49) mGycm respectively, then P <0.01, the dif- ference of radiation dose had statistical significance (P<0.05). Conclusions: For coronary artery imaging with DSCT the heart electric pulse (AUTO) regulation technology can meet the diagnostic requirements and effectively reduce the radiation dose.
文摘Objective: To compare and analyze the image quality and radiation dose of three scanning modes of dual-source CT coronary artery retrospectively, and to discuss the application value of TurboFlash coarse pitch scanning mode. Methods: The imaging data of 100 patients who underwent CT coronary angiography (CCTA) using Siemens force CT retrospective gated triggering spiral scan (RES-SPIRAL), adaptive prospective gated triggering sequence scan (SEQ) and prospective coarse pitch scan (TurboFlash) retrospectively was collected. The image quality was evaluated by objective and subjective methods. The effective radiation dose of patients was compared and analyzed, and the indications of the three scanning modes were analyzed. The application value of dual-source CT TurboFlash coarse pitch scanning in coronary artery imaging was evaluated. Results: The results showed that the left main coronary artery, the right coronary artery and their tertiary branches could be clearly displayed in the three groups of images: the left anterior descending branch, the left circumflex branch, and their three-level branches. There was no statistical difference in subjective image quality among the three groups of pictures (P > 0.05). There was no statistical difference in objective evaluation indexes, such as CT value, SNR, CNR and Noise among the three groups (P > 0.05). The patient radiation dose results showed that the effective radiation dose ED of RES-SPIRA scan was (9.22 ± 1.33) mSv. The dose of SEQ was (2.88 ± 2.47) mSv, and the dose of TurboFlash was (0.51 ± 0.16) mSv. There was significant difference in comparison of the three groups (P 0.05). RES-spiral scanning had the highest radiation dose and TurboFlash coarse pitch scanning (TurboFlash) had the lowest radiation dose. Conclusion: TurboFlash coarse pitch scanning is low in dosage, fast in speed and wide in adaptability. It is especially suitable for the elderly, children, coma and other patients who cannot cooperate with breath-holding examination, as well as for the screening and examination of coronary artery diseases in asymptomatic population. Undoubtedly, it is a worthy method of heart coronary artery examination.
文摘Objective: to analyze the value of brand A dual-source CT scan in the differential diagnosis of lung cancer. Methods: 40 suspected cases of lung cancer admitted to our hospital from July 2021 to January 2022 were all examined by brand A dual-source CT scan. At the same time, the results of surgical pathological biopsy were analyzed to evaluate the value of the former in the differential diagnosis of lung cancer. Results: the 40 cases of suspected lung cancer were confirmed by surgical biopsy, and the remaining 10 cases were benign lesions, including 25 of 30 were adenocarcinoma and 5 squamous carcinoma. The diagnosis of the cases in this group of bisource CT suggested that 28 patients had lung cancer, and the remaining 12 patients were benign lesions, of which 25 patients had confirmed adenocarcinoma and 5 patients had squamous carcinoma. Using surgical pathological biopsy results as the reference standard, dual-source CT was 90.00% specific, 96.67% sensitive and 95.00% accurate;Overlay arterial and standardized iodine venous phase were lower than benign patients (P < 0.05), including Overlay venous, aortic iodine and benign patients (P> 0.05). Conclusion: the accuracy, specificity and sensitivity of brand A dual-source CT scan applied in the differential diagnosis of lung cancer are relatively high, among which Overlay arterial stage and standardized iodine concentration venous stage can be used as practical indicators of disease identification.
