排序方式： 共有122条查询结果，搜索用时 15 毫秒
111.
应用跟骨定量超声仪 (QUS -2 )对 9个年龄段 ( 4年为 1段 ) 3 3 4名 (男 163人 ,女 171人 )健康志愿者 (除外患有影响骨代谢疾病及跟骨疾病者 ) ,进行跟骨超声振幅衰减 (BUA)测定。结果显示 :①峰值BUA位于 3 5～ 3 9岁年龄段 ,男性 ( 116 81± 3 2 6dB/MHz) ;女性 ,( 10 5 3 9± 5 2 2dB/MHz) ;②峰值骨量过后BUA随增龄而逐渐降低 (P <0 0 1) ,至 45岁年龄段时 ,男女均进入骨量减少期 :女性 5 0岁、男性 5 5岁年龄段时BUA均值进入骨质疏松期 ;③跟骨定量超声骨量峰值无明显性别差异 ,建立的峰值骨量可作为临床和流行病学研究诊断骨质疏松的基础参考值。 相似文献
112.
探讨实时、动态的超声方法诊断半月板损伤的价值。方法：对52名摔跤、柔道运动员采用旋转和拉动手法活动膝关节，同时应用实时、动态的超声检测方法观察膝关节半月板的形态。结果：采用拉、挤、旋转等动作的同时实时、动态进行超声检查提高了半月板诊断的准确率、敏感率。结论：实时、动态的超声技术不失为临床诊断半月板损伤的优选检查方法，值得加以推广。 相似文献
113.
陆芳 《金华职业技术学院学报》2007,7(4):73-74,78
目的:探讨超声在腹腔镜手术前诊断腹腔粘连,及防止trocar腹壁戳创损伤的应用价值.方法:选择56例接受腹腔镜手术患者.采用自身手术前后对照方法,术前应用超声对脐孔、剑突下、右下腹三处最常用腹壁戳创部位,局部腹壁下粘连进行诊断,并与术中腹腔镜下所见实际结果相对照.结果:比较56例二次腹部手术患者,腹腔镜手术前后超声诊断结果.脐孔、剑突下、右下腹粘连诊断准确性分别为95%;98%;91%.手术前后比较,差异无显著性意义(P＜0.05),术前超声诊断与术中所见基本一致.结论:术前超声对腹壁下有无粘连判断准确,对腹腔镜手术选取第一穿刺点,防止trocar戳创损伤腹内脏器及意外出血具有帮助作用及临床意义. 相似文献
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115.
Xiang Ji Jing-feng Bai Guo-feng Shen Ya-zhu Chen 《Journal of Zhejiang University. Science. B》2009,10(9):639-647
et tissue by either moving single focal point or generating multiple loci simultaneously. 相似文献
116.
Professional baseball players have attempted to illegally modify baseball bats in the hopes of increasing bat speed and thus
the distance travelled by batted balls. To date, no low-cost, non-invasive, real-time solution exists to this problem. Previously
proposed solutions to this problem that involved using radar to measure the scatter signature of a scanned baseball bat were
found to be extremely expensive. Ultrasound technology offers the ability to provide equivalent scatter signature measurements
as compared to radar technology at a much lower cost and level of complexity while still operating in real time. We therefore
present an ultrasound-based implementation of a prototype for a hand-held scanner unit designed to detect illegally modified
baseball bats. A detailed discussion of the performance enhancements resulting from illegally modifying a baseball bat will
be provided and an analysis of the attenuative properties of wood will be presented to determine appropriate sample rates
for the ultrasound unit. Data acquisition issues encountered in prototyping the scanner will be examined and measurement data
for both solid wood bats and modified bats will be evaluated to determine the effectiveness of the ultrasound-based data acquisition
unit and the prototype’s ability to distinguish between both types of scatter signatures. 相似文献
117.
摘要：运动损伤是运动员训练过程中的常见问题,是影响其竞技水平发展的重要因素。运动损伤的全面、准确评估对于确定治疗手段、制定康复训练计划、缩短恢复时间十分关键。随着影像学手段的发展与普及,超声、磁共振等成像方法被广泛用于运动损伤的评价中。目前在运动损伤评价中应用较多的成像方法包括超声成像中的M超、组织多普勒、超声弹性成像,磁共振成像中的结构像、磁共振波谱、T1ρ成像等,这些成像手段在肌肉拉伤等器质性损伤评价中发挥了重要的作用。同时,不少运动损伤在表现出器质性改变后就很难恢复至最佳状态,迫切需要早期的功能评价手段。近年来无创灌注成像、氧代谢成像等新兴功能成像方法的出现在这方面表现出了很大的优势,具有积极的潜在应用价值。进一步,基于运动员的影像数据或日常监测数据,丰富的机器学习以及人工智能技术的快速发展,为运动损伤的自动评估和预警带来了可能。本研究主要对影像学在运动损伤中的应用研究进行了总结概括,并对近年来快速发展的人工智能在运动损伤领域的重要贡献进行了简要总结,最后对影像学在运动损伤预警与评价等方面的应用进行了展望。 相似文献
118.
1 Ｉｎｔｒｏｄｕｃｔｉｏｎ Ｔｈｅｃｈｅｍｉｃａｌｅｆｆｅｃｔｓｏｆｕｌｔｒａｓｏｕｎｄａｒｅｄｕｅｔｏｈｉｇｈｐｒｅｓｓｕｒｅｐｒｏｄｕｃｅｄｄｕｒｉｎｇｖｉｏｌｅｎｔｃｏｌｌａｐｓｅｏｆｃａｖｉｔａｔｉｏｎｂｕｂｂｌｅｓ.Ｔｈｅｒｅａｃｔｉｏｎｓｄｏｎｏｔｔａｋｅ ｐｌａｃｅｈｏｍｏｇｅ ｎｅｏｕｓｌｙｉｎｔｈｅｓｏｌｕｔｉｏｎｂｕｔｉｎ”ｈｏｔｓｐｏｔｓ”ｗｈｅｒｅｃａｖｉ ｔａｔｉｏｎｂｕｂｂｌｅｓｐｕｌｓａｔｅｏｒｃｏｌｌａｐｓｅ .Ｄｕｒｉｎｇｔｈｅａｄｉａｂａｔ ｉｃｃｏｍｐｒｅｓｓｉｏ… 相似文献
119.
Rosalyn A. Jurjus Kathryn Dimorier Kirsten Brown Frank Slaby Hamid Shokoohi Keith Boniface Yiju Teresa Liu 《Anatomical sciences education》2014,7(5):340-349
The utilization of bedside ultrasound by an increasing number of medical specialties has created the need for more ultrasound exposure and teaching in medical school. Although there is a widespread support for more vertical integration of ultrasound teaching throughout the undergraduate curriculum, little is known about whether the quality of ultrasound teaching differs if performed by anatomists or clinicians. The purpose of this study is to compare medical students' evaluation of ultrasound anatomy teaching by clinicians and anatomists. Hands‐on interactive ultrasound sessions were scheduled as part of the gross anatomy course following principles of adult learning and instructional design. Seven teachers (three anatomists and four clinicians) taught in each session. Before each session, anatomists were trained in ultrasound by clinicians. Students were divided into groups, rotated teachers between sessions, and completed evaluations. Results indicated students perceived the two groups as comparable for all factors except for knowledge organization and the helpfulness of ultrasound for understanding anatomy (P < 0.001). However, results from unpaired samples t‐tests demonstrated a nonstatistically significant difference between the groups within each session for both questions. Moreover, students' test performance for both groups was similar. This study demonstrated that anatomists can teach living anatomy using ultrasound with minimal training as well as clinicians, and encourage the teaching of living anatomy by anatomists in human anatomy courses using ultrasound. Repeating this study at a multicenter level is currently being considered to further validate our conclusion. Anat Sci Educ 7: 340–349. © 2013 American Association of Anatomists. 相似文献
120.
张慧苹 《济宁师范专科学校学报》2014,(3):14-17
氰基丙烯酸酯类化合物是一类重要的抑制植物光合作用的PSII除草剂,以氰乙酸乙酯为原料合成了系列中间体及该目标化合物,研究了超声条件对该反应的影响,同时合成了8个手性化合物,并对其进行了抗烟草花叶病毒(TMV)生物活性测定,发现部分手性化合物有一定治疗活性. 相似文献