Detection of Air Embolus by Doppler Ultrasonics
نویسندگان
چکیده
منابع مشابه
Detection of wetwood by ultrasonics
Wetwood, or bacterially infected wood, is a severe processing problem and causes serious drying defects in lumber. The detection of wetwood is, therefore, important for proper processing and quality wood products. An investigation has been carried out to detect wetwood of cherrybark oak (Quercus pagoda Raf.), water oak (Quercus nigra, L.), hickory (Carya spp.), and eastern cottonwood (Populus d...
متن کاملextremal region detection guided by maxima of gradient magnitude
a problem of computer vision applications is to detect regions of interest under dif- ferent imaging conditions. the state-of-the-art maximally stable extremal regions (mser) detects affine covariant regions by applying all possible thresholds on the input image, and through three main steps including: 1) making a component tree of extremal regions’ evolution (enumeration), 2) obtaining region ...
Embolus differentiation using multifrequency transcranial Doppler.
Embolus Differentiation Using Multifrequency Transcranial Doppler To the Editor: Markus and Punter report disappointing results for differentiation between solid and gaseous emboli using both the default settings of the Embo-Dop multifrequency transcranial Doppler system,1 and the modified criteria recommended by Russell and Brucher.2,3 One reason for this poor performance is a fundamental limi...
متن کاملAutomatic embolus detection by a neural network.
BACKGROUND AND PURPOSE Embolus detection using transcranial Doppler ultrasound is a useful method for the identification of active embolic sources in cerebrovascular diseases. Automated embolus detection systems have been developed to reduce the time of evaluation in long-term recordings and to provide more "objective" criteria. The purpose of this study was to evaluate the critical conditions ...
متن کاملNondestructive detection of titanium disilicide phase transformation by picosecond ultrasonics
We demonstrate that picosecond ultrasonics is a sensitive nondestructive probe of the formation of TiSi, from the reaction of titanium films on silicon annealed at temperatures of 300-800 “C. From the measured change in optical reflectivity, the responses due to electronic excitation, acoustic echoes, and thermal coupling to the underlying Si are resolved. The results show significant differenc...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the Royal Society of Medicine
سال: 1969
ISSN: 0035-9157
DOI: 10.1177/003591576906201018