title: Two-dimensional ultrasound detection with unfocused frequency-randomized signals.
abstract: A method is described for detecting scattering in two-dimensions using an unfocused ultrasound field created from a continuously driven source array. The frequency of each element on the array is unique, resulting in a field that is highly variant as a function of both time and position. The scattered signal is then received by a single receiving line. The method, as currently written, is valid under the first order Born approximation. To demonstrate the approach, a series of simulations within the frequency range of 0.10-1.25 MHz are performed and compared with a simulated B-Scan in the same frequency range. The method is found to be superior in resolving closely spaced objects, discerning 1.4 mm separation in the radial and 0.5-mm separation in the axial direction. The method was also better able to determine object size, resolving scatters less than 10% of wavelength associated with the center frequency.
authors.affiliation: Department of Radiology, Harvard Medical School, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA. gclement@hms.harvard.edu
authors.forename: Gregory T
authors.initials: GT
authors.lastname: Clement
mesh_terms: D001842:Bone and Bones / Q000000981:diagnostic imaging; D003198:Computer Simulation; D004453:Echoencephalography / Q000379:methods*; D006801:Humans; D008962:Models, Theoretical; D012815:Signal Processing, Computer-Assisted; D014463:Ultrasonography / Q000379:methods*