Optimal placement of the region of interest for bolus tracking on brain computed tomography angiography in Beagle dogs     

Sieun PARK  Min JANG  Kija LEE  Hojung CHOI  Youngwon LEE  Inchul PARK  Sooyoung CHOI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(8):1196

This study aimed to determine the optimal placement of the region of interest (ROI) among four anatomical sites—pulmonary artery (PA), pulmonary vein (PV), aortic arch (AA), and carotid artery (CA)—in computed tomography (CT) brain angiography with automatic bolus tracking in healthy beagle dogs. Six beagles were included, and CT brain angiography was performed four times for each dog, to cover each ROI. The scan parameters, amount, and injection rate of the contrast medium were the same. The major intracranial arteries were selected for quantitative and qualitative evaluation: caudal cerebellar artery (CcA), basilar artery (BA), rostral cerebellar artery (RcA), caudal cerebral artery (CCA), middle cerebral artery (MCA), and rostral cerebral artery (RCA). Quantitative evaluation showed significantly higher CT attenuation values for the RcA, CCA, and MCA in the PA group and RcA and MCA in the PV group than in the CA group. Qualitative analysis revealed significantly higher scores for the BA, CCA, and MCA in the PA and PV groups than in the CA group. Venous contamination did not differ significantly among the ROIs, but the mean scores of the AA and CA groups were higher than those of the PA and PV groups. CT brain angiography using bolus tracking in the beagle dogs showed that the ROI should be placed at the PA or PV rather than at the CA for optimal images with strong contrast enhancement of the BA, RcA, CCA, and MCA and minimal venous contamination.  相似文献   

林业贷款中央财政贴息资金管理系统的研建     

朱艳 《林业资源管理》2009,(3)

阐述了林业贷款中央财政贴息资金管理系统的实现过程和方法。系统采用基于Web的B/S体系的三层结构,使用Oracle为数据管理平台,采用ASP作为程序开发工具。系统页面设计简洁、使用方便,信息录入、管理、审核、导出功能完善,安全性较高,对使用中央财政贴息资金的部门具有借鉴作用。  相似文献   

培养学生学习兴趣 提高英语教学效果     

鲁春芳 《湖南农机》2008,(5):47-49

如何提高学生学习英语的兴趣,历来为广大教师和教育学家们所关注。作者从自己多年的教学实践出发,着重探讨在大学英语教学中应该如何进行师生情感交流以增强学生学习英语的自信心,提高学习英语的兴趣,从而提高英语教学效果．  相似文献   

跨区域粮食销售市场中各主体利益的协调分析     

王薇薇  王雅鹏  孙凤莲  叶慧 《农业现代化研究》2010,31(1):5-10

本文以粮食销售市场中粮食所有权的流程为线,对市场中各利益主体间的关系进行探讨,并运用交易费用理论,分析市场粮源充足和市场粮源不充足两种情况下阻碍跨区域粮食流通的主要因素。结果表明,降低市场交易费用、提高粮食购销企业间的交易效率是协调粮食销售市场各主体利益、顺畅跨区域粮食流通的关键。最后,从政府的角度,针对如何提高不同市场供需情况下购销企业的交易效率问题,提出政策建议。  相似文献   

绪论在“动物遗传学”教学中的作用   总被引：1，自引：0，他引：1  

杨秀芹 《黑龙江农业科学》2010,(11):176-178

论述了绪论在动物遗传学教学中的作用;指出上好绪论课不仅能够激发学生的学习兴趣、掌握学习的主要内容,帮助学生打开动物遗传学学习的大门,而且能够通过对遗传学形成、发展过程中一些重大研究成果、杰出人物事迹的介绍培养学生的科学素养。  相似文献   

基于图像处理的边坡表面状态检测方法研究     

严传鹏 《农业网络信息》2011,(8):8-10

针对图像边坡表面状态发生的变化检测,提出了一种新的智能检测方法。人工设置两个目标体,一个作为参考标识点,一个作为监测点,标识点具有特殊的颜色(红色)与形状(圆形),以两者之间的相对位移来表征边坡的状态变化。该方法由以下4个环节构成:选取特定目标体,设置目标体;将图像转换到HIS空间,提取特定的颜色---红色,确定感兴趣区域(ROI);进行图像二值化,确定感兴趣区域的中心坐标;通过位移判定准则判定边坡表面状态是否发生变化。实验证明,该方法具有鲁棒性好、检测准确率高等特点。  相似文献   

Remote sensing to detect plant stress induced by Heterodera schachtii and Rhizoctonia solani in sugar beet fields     

C. Hillnhütter  A.-K. MahleinR.A. Sikora  E.-C. Oerke 《Field Crops Research》2011,122(1):70-77

The characteristically clustered occurrence and low level of mobility of Heterodera schachtii and Rhizoctonia solani in the soil and the induction of stress symptoms in the sugar beet canopy make them ideal targets for site-specific arrangements with precision agriculture tools. A field site infested with H. schachtii and R. solani was investigated in 2009 with near-range and aerial hyperspectral sensors during the growing season. At 31 sample points ground truth data for incidence and severity of the two organisms were collected and geo-referenced. Spectral vegetation indices computed from reflectance measurements obtained from two flight campaigns (AISA, 17th of June; HyMap, 28th of August) and the near-range spectroradiometers were significantly correlated (P < 0.01) with symptoms caused by the nematode or Rhizoctonia crown and root rot. A supervised classification with Spectral Angle Mapper of leaf symptoms induced by the organisms resulted in a classification accuracy of 72 and 64% for the AISA and HyMap data, respectively. The results demonstrated that remote sensing in combination with geographic information system technologies can be used effectively for the detection and mapping of symptoms caused by beet cyst nematode and Rhizoctonia crown and root rot.  相似文献   

基于图像识别的边坡表面位移检测方法研究     

彭艺  黄小华 《计算机与农业》2012,(6):16-18,33

针对边坡表面状态发生的变化检测,提出了一种新的智能检测方法。人工设置两类标识体,一类为定位标识,一类为观测标识。用图像识别方法对标识体的质心进行提取和计算,通过一定的判别准则来判断边坡的表面位移状况。具体处理方法为先将图像转换到HIS空间,根据设定的颜色提取感兴趣区域。进行图像边缘二值化处理,计算出感兴趣区域的中心坐标值。实验证明,该方法具有鲁棒性好、检测准确率高等特点。  相似文献   

注重培养大学生体育自我锻炼的兴趣与习惯     

刘翀  蔡运鹏 《吉林农业科技学院学报》2008,(1):62-64

对我校05级、06级178名男生自我锻炼情况进行了问卷调查，结果发现，多数学生对体育锻炼具有一定的认识。但认识与具体行动尚存在一定的差距，缺乏自我锻炼的习惯。鉴于上述结果，如何培养学生自我锻炼的兴趣与习惯，提出了方法、措施，为今后进一步研究学生自我锻炼的兴趣与习惯提供依据。  相似文献   

《市场营销学》课程教学的探索与实践   总被引：2，自引：0，他引：2  

刘圣春  余嗣俊 《辽宁农业职业技术学院学报》2010,12(1):52-54

对《市场营销学》课程在教材选用、教学方法的使用、考试成绩的评定几个方面进行改革探索和实践。从而培养学生扎实的市场营销技能，实现高职教育培养目标。  相似文献