Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Paul A. Picot"'
Publikováno v:
Medical Imaging 2021: Physics of Medical Imaging.
The MTF and DQE of an x-ray detector are important metrics of performance. They are generally measured following IEC guidelines which requires the use of raw (unprocessed) images. However, many detectors now incorporate processing algorithms that are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::71463367a617e53d4eb5c23ff3c65244
https://doi.org/10.1117/12.2580057
https://doi.org/10.1117/12.2580057
Publikováno v:
Magnetic Resonance in Medicine. 78:1599-1606
Purpose To develop a new method capable of directly measuring specific absorption rate (SAR) deposited in tissue using the thermoacoustic signal induced by short radiofrequency (RF) pulse excitation. Theory A detailed model based on the thermoacousti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92401d998deb4d43c11a00fac1f258b7
https://doi.org/10.1002/mrm.26517
https://doi.org/10.1002/mrm.26517
Autor:
R. L. Bondar, Flo Stein, Jorge M. Serrador, Todd T. Schlegel, A. H. Rupert, Paul A. Picot, Mahmood S. Kassam, Scott J. Wood
Publikováno v:
Journal of Applied Physiology. 91:1986-1994
We examined the effects of 30 min of exposure to either +3GX(front-to-back) or +GZ (head-to-foot) centrifugation on cerebrovascular responses to 80° head-up tilt (HUT) in 14 healthy individuals. Both before and after +3 GX or +3 GZ centrifugation, e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::64321f4f7f9c6253c6ba4b317b3fae98
https://doi.org/10.1152/jappl.2001.91.5.1986
https://doi.org/10.1152/jappl.2001.91.5.1986
Publikováno v:
Magnetic Resonance in Medicine. 46:1093-1098
A hybrid two-dimensional relaxometry (2DR) sequence was used to simultaneously measure both the spin-spin (R2) and spin-lattice relaxation rates (R1) of skeletal muscle in vivo. The 2DR sequence involved a 180° inversion pulse followed by a variable
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f7bf79c3e77342a331d2503af8f9b68
https://doi.org/10.1002/mrm.1304
https://doi.org/10.1002/mrm.1304
Publikováno v:
Kinesiology Publications
ResearcherID
ResearcherID
Background and Purpose —The relationship between middle cerebral artery (MCA) flow velocity (CFV) and cerebral blood flow (CBF) is uncertain because of unknown vessel diameter response to physiological stimuli. The purpose of this study was to dire
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5e09039e0d8761de2ae62f8209dc22a9
https://doi.org/10.1161/01.str.31.7.1672
https://doi.org/10.1161/01.str.31.7.1672
Publikováno v:
Ultrasound in Medicine & Biology. 21:1163-1176
Doppler ultrasound flow measurement techniques are often validated using phantoms that simulate the vasculature, surrounding tissue and blood. Many researchers use rubber tubing to mimic blood vessels because of the realistic acoustic impedance, robu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::828e15aa8e6ea7626b74f0c07a582656
https://doi.org/10.1016/0301-5629(95)00044-5
https://doi.org/10.1016/0301-5629(95)00044-5
Publikováno v:
Ultrasound in Medicine & Biology. 21:1199-1209
A system is described in which the volume flow rate of blood in a vessel is determined using transverse colour Doppler ultrasound imaging. The system measures rapidly the two-dimensional velocity profile of blood flowing through a vessel. By integrat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::651544fefe956efc3f8e74064cc48539
https://doi.org/10.1016/0301-5629(95)02013-6
https://doi.org/10.1016/0301-5629(95)02013-6
Publikováno v:
Ultrasound in Medicine & Biology. 21:807-816
A quantitative in vitro flow study was performed by using a three-dimensional colour Doppler imaging system. This system was based on a clinical ultrasound instrument with its transducer mounted on a motor-driven translation stage. A vascular and tis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cd9003951d8f23ee5d2713983e6bf353
https://doi.org/10.1016/0301-5629(95)00007-e
https://doi.org/10.1016/0301-5629(95)00007-e
Autor:
P.M. Embree, Paul A. Picot
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 41:340-345
The direct measurement of the velocity profile of blood flowing in a vessel yields a volume flow estimate that is more accurate than single-point Doppler ultrasound. A volume flow estimate is made by assuming a circularly symmetric velocity field and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e1c39e712a2db649fb64ad59d589a017
https://doi.org/10.1109/58.285468
https://doi.org/10.1109/58.285468
Autor:
Ken C. Chu, Linda M. Gowman, David W. Holdsworth, Richard Frayne, Maria Drangova, Brian K. Rutt, Daniel W. Rickey, Aaron Fenster, Curtis B. Caldwell, Paul A. Picot
Publikováno v:
Medical Physics. 20:415-425
A technique for producing accurate models of vascular segments for use in experiments that assess vessel geometry and flow has been developed and evaluated. The models are compatible with x-ray, ultrasound, and magnetic resonance (MR) imaging systems
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7c1459dd9accfdba1f7432cb684f70ab
https://doi.org/10.1118/1.597141
https://doi.org/10.1118/1.597141