title: Broadband method for measuring the ultrasonic absorption spectrum of biological tissues.
abstract: An apparatus is described which in the frequency range from about 5 to 500 MHz allows the ultrasonic absorption coefficient of biological tissues to be measured with 1% accuracy. This apparatus is based on a pulse transmission method in which a computer-controlled mode of operation is combined with a RF substitution technique. Superheterodyne detection of the transmitted signal, multiple data recording and signal averaging result in a high sensitivity of the measuring method. The apparatus can be also used to analyze the ultrasonic pulse reflected by the sample.
authors.affiliation: Drittes Physikalisches Institut, Universität Göttingen.
authors.forename: U
authors.initials: U
authors.lastname: Kaatze
authors.forename: F D
authors.initials: FD
authors.lastname: Scholle
mesh_terms: D006801:Humans; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D013057:Spectrum Analysis / Q000379:methods*; D014465:Ultrasonics