title: Ultrasonic backscatter coefficients for weakly scattering, agar spheres in agar phantoms.
abstract: Applicability of ultrasound phantoms to biological tissue has been limited because most phantoms have generally used strong scatterers. The objective was to develop very weakly scattering phantoms, whose acoustic scattering properties are likely closer to those of tissues and then compare theoretical simulations and experimental backscatter coefficient (BSC) results. The phantoms consisted of agar spheres of various diameters (nominally between 90 and 212 microm), containing ultrafiltered milk, suspended in an agar background. BSC estimates were performed at two institutions over the frequency range 1-13 MHz, and compared to three models. Excellent agreement was shown between the two laboratory results as well as with the three models.
authors: Bioacoustics Research Laboratory, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 405 North Mathews, Urbana, Illinois 61801, USA.
authors: Michael R
authors: MR
authors: King
authors: Janelle J
authors: JJ
authors: Anderson
authors: Maria-Teresa
authors: MT
authors: Herd
authors: Darryl
authors: D
authors: Ma
authors: Alexander
authors: A
authors: Haak
authors: Lauren A
authors: LA
authors: Wirtzfeld
authors: Ernest L
authors: EL
authors: Madsen
authors: James A
authors: JA
authors: Zagzebski
authors: Michael L
authors: ML
authors: Oelze
authors: Timothy J
authors: TJ
authors: Hall
authors: William D
authors: WD
authors: O'Brien
mesh_terms: D000362:Agar; D000818:Animals; D008863:Microspheres; D008892:Milk; D008962:Models, Theoretical; D015588:Observer Variation; D010316:Particle Size; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D014462:Ultrafiltration; D014463:Ultrasonography / Q000295:instrumentation*
chemical_list: D000362:Agar