Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Louis Allard"'
Publikováno v:
Medical & Biological Engineering & Computing. 37:504-510
This paper analyses the performance of four different feature-selection approaches of the Karhunen-Loève expansion (KLE) method to select the most discriminant set of features for computer-assisted classification of bioprosthetic heart-valve status.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0a649596af060d77a79c16ef12cdd929
https://doi.org/10.1007/bf02513337
https://doi.org/10.1007/bf02513337
Publikováno v:
Ultrasound in Medicine & Biology. 24:503-511
In most studies that were aimed at evaluating the kinetics of red blood cell (RBC) aggregation, human blood was initially circulated at a high shear rate to disrupt the aggregates, and measurements were performed following a complete flow stoppage, d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dab2a4c0bb5fa98538a19f4f7c186df5
https://doi.org/10.1016/s0301-5629(98)00019-2
https://doi.org/10.1016/s0301-5629(98)00019-2
Publikováno v:
Journal of Vascular Surgery. 27:681-688
Purpose: The study was done to improve quantification of multiple arterial stenoses and to investigate a new imaging technique for lower limb arteries. Three-dimensional power Doppler angiography was used to quantify in vitro arterial stenoses. Metho
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::091415db1a57114ae645d9988b14a7e7
https://doi.org/10.1016/s0741-5214(98)70234-4
https://doi.org/10.1016/s0741-5214(98)70234-4
Autor:
Raymond Beaulieu, Xiaoduan Weng, Ghislaine O. Roederer, Guy Cloutier, Louis Allard, Francine Tardif
Publikováno v:
Ultrasound in Medicine & Biology. 23:1383-1393
The objectives of this study were to detect differences in the Doppler power backscattered by blood in vivo, and to identify factors affecting the backscattered power. The main hypothesis was that variations in the erythrocyte aggregation level betwe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::90f76fb7357a5b45e6bc544eb402ae20
https://doi.org/10.1016/s0301-5629(97)00199-3
https://doi.org/10.1016/s0301-5629(97)00199-3
Publikováno v:
Ultrasound in Medicine & Biology. 23:41-45
The Doppler signal is generally considered as a Gaussian random process. However, to date very little experimental validation of this model has been available. Recently, the K model was proposed to describe the statistical properties of ultrasonic ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::de2e96ddbd39b5b34ddee3975a63c4db
https://doi.org/10.1016/s0301-5629(96)00186-x
https://doi.org/10.1016/s0301-5629(96)00186-x
Publikováno v:
Journal of Biomechanical Engineering. 118:318-325
Blood flow turbulence downstream of a concentric 86 percent area reduction stenosis was characterized using absolute and relative Doppler spectral broadening measurements, relative Doppler velocity fluctuation, and Doppler backscattered power. Bidi-m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b51af9c8bd9f472338febab5f85b2a29
https://doi.org/10.1115/1.2796013
https://doi.org/10.1115/1.2796013
Publikováno v:
Ultrasound in Medicine & Biology. 21:471-480
The objective of this study was to evaluate in vitro the accuracy of the Doppler velocity ratio (VR) (intrastenotic velocity/prestenotic or poststenotic velocity) under different geometric conditions simulating the presence of multiple stenoses. A st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::632f5e2c7836a10601acbfaa842771ba
https://doi.org/10.1016/0301-5629(94)00132-w
https://doi.org/10.1016/0301-5629(94)00132-w
Publikováno v:
Ultrasound in Medicine & Biology. 21:59-70
The main objective of the present work was to investigate, under pulsatile flow, the patterns of variation of the Doppler power backscattered by blood and Sephadex particles upstream and downstream of concentric and eccentric stenoses ranging from 47
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3ebea2144e9dcbf02b13e534f5af41a1
https://doi.org/10.1016/0301-5629(94)00093-x
https://doi.org/10.1016/0301-5629(94)00093-x
Publikováno v:
Journal of Vascular Surgery. 19:650-657
Purpose: The purpose of this study was to provide a quantitative evaluation of the effect of adjacent segment lesions on disease classification in lower limb arteries by ultrasonic duplex scanning. Methods: Lower limb arterial duplex scanning from th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e857be19db2dc1864b5f6992f7765f5a
https://doi.org/10.1016/s0741-5214(94)70038-9
https://doi.org/10.1016/s0741-5214(94)70038-9
Publikováno v:
Medical & Biological Engineering & Computing. 31:237-241
The normality (Gaussian property) and stationarity of the cardiac Doppler blood-flow signal were evaluated on short-time segments distributed over the cardiac cycle. The basic approaches used to perform statistical tests on the nonstationary and quas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::07234c1b326e50e6609c5c5581f03034
https://doi.org/10.1007/bf02458042
https://doi.org/10.1007/bf02458042