• Nachlese ISMA (International Symposium of Musical Acoustics) 2004 (Nara, Japan) und
• Nachlese ICA 2004 (Kyoto, Japan)
• drei von Österreichern in Japan vorgestellte Paper zur Musikalischen Akustik

Ein Tagesordnungspunkt wird die Mitgliedschaft im ICA betreffen, siehe das diesbezügliche Schreiben des Präsidenten der ICA, Gilles Daigle.

Ich möchte Sie auch auf einen neugeschaffenen, sehr attraktiven Preis der ICA aufmerksam machen und Bewerbungen ermuntern. Der “Early Career Award” wird erstmals auf der ICA in Kyoto im nächsten Jahr verliehen. Näheres siehe http://www.icacommission.org/eaward.html
 

"Einführung in die Physik der Musikinstrumente"
Ao Univ.Prof. Dr. E. Gratz

Beschreibung siehe hier.

Mo, 15. September 2003 um 15.00 Uhr s.t.
Seminarraum des Instituts, AKH Ebene 4L (UNIVERSITÄT WIEN, INSTITUT F. BIOMEDIZINISCHE TECHNIK & PHYSIK, AKH WIEN, EBENE 4 L, WÄHRINGER GÜRTEL 18 - 20, A - 1090 WIEN)

Gastvortrag von Prof. K.K. Shung
(IEEE distinguished lecturer 2002/2003)
Department of Biomedical Engineering, University of Southern California, Los Angeles

Ultrasonic scattering by blood has been studied both theoretically and experimentally for many years for the purpose of a better characterization of the performance of ultrasonic Doppler flow and imaging devices. In the course of these investigations it became clear that ultrasonic scattering from blood or or echogenicity of blood is critically related to the hematological and hemodynamic properties of blood. It can be affected by hematocrit, plasma protein concentration, flow rate and flow cycle duration, to name just a few parameters. The experimental efforts have been paralleled by theoretical developments that successfully predict many experimental observations.
An unexpected conclusion from this work is that ultrasound appears to be a totally unexplored and ignored tool for blood flow visualization and hemodynamic measurements. Two unique hemodynamic phenomena that have never been reported in the hemodynamic literature have been observed: the black hole, a low echogenic zone in the center stream of whole blood flowing in a blood vessel under steady flow and the collapsing ring, an echogenic ring appearing near the periphery of a vessel at the beginning of a flow cycle, converging toward the center, and eventually collapsing during pulsatile flow. They are believed to be resulted from the spatial and temporal variations of the shear rate in the blood stream. With the recent technical advances including standard B-mode, color Doppler, power Doppler, and Bflow imaging, clinical reports of observing similar phenomena in vivo on human patients begin to appear. These are exciting evidences to showcase the viability and effectiveness of ultrasound as a tool for blood flow visualization and quantitative measurements of hemodynamic parameters. Ultrasound is much superior than current technologies such as optical tracing of fluorescent particles in that it can penetrate light opaque structures. However, it must be realized that much effort for advocating the merits of ultrasound is needed before it will be recognized and accepted by the hemodyamics community. In this talk, a historic discussion of these developments, results from recent studies, and a perspective of the future will be given.