keyword
https://read.qxmd.com/read/2368223/ibr5-an-optimal-measurement-of-integrated-backscatter-and-cyclic-variation-of-integrated-backscatter
#21
JOURNAL ARTICLE
T L Rhyne, K B Sagar
Various methods have been developed to measure the coefficient of volume backscatter. For these measures, correction has made for signal energy, instrumentation/transducer filtration, diffraction and bulk loss, while using various square law or log magnitude detectors. Also, tissue backscatter has been measured as a function of frequency and the statistics of the backscatter has been examined. This paper unites methods of measuring a properly scaled (unbiased) estimate of the backscatter coefficient with knowledge of the scattering statistics and frequency response using statistical communications techniques...
July 1990: Ultrasonic Imaging
https://read.qxmd.com/read/2201447/quantitative-ultrasonic-assessment-of-normal-and-ischaemic-myocardium-with-an-acoustic-microscope-relationship-to-integrated-backscatter
#22
JOURNAL ARTICLE
K B Sagar, D H Agemura, W D O'Brien, L R Pelc, T L Rhyne, L S Wann, R A Komorowski, D C Warltier
PURPOSE OF INVESTIGATION: The aim was to study ultrasonic propagation properties of normal and ischaemic myocardium with a scanning laser acoustic microscope and to correlate these changes with ultrasonic backscatter. DESIGN: Myocardial ischaemia was produced by total occlusion of left anterior descending coronary artery in anaesthetised open chest dogs. Myocardium supplied by left circumflex coronary artery served as normal control. IBR5, an optimum weighted frequency average (4-6...
June 1990: Cardiovascular Research
https://read.qxmd.com/read/1703768/role-of-ultrasonic-tissue-characterization-to-distinguish-reversible-from-irreversible-myocardial-injury
#23
COMPARATIVE STUDY
K B Sagar, L R Pelc, T L Rhyne, R A Komorowski, L S Wann, D C Warltier
Tissue characterization reflects structural and functional integrity of tissues. Inasmuch as reversible ischemia causes no structural damage and irreversible ischemia results in persistent structural myocardial damage, we postulated that ultrasonic tissue characterization can distinguish the two types of injuries. Anesthetized open chest dogs underwent 15 minutes (group 1, n = 5) and 90 minutes (group 2, n = 8) of acute total occlusion of the left anterior descending coronary artery, followed by 3 hours of reperfusion...
November 1990: Journal of the American Society of Echocardiography
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