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- Title
CHARACTERIZATION OF ANNULAR ARRAY TRANSDUCER.
- Authors
Moraru, Luminita; Onose, Laura; Chiselev, Ana-Maria
- Abstract
The aim of the current study was to compare the beam patterns for annular array with different annular number of elements in a homogenous medium. An alternative approach to linear arrays is to employ an annular array transducer, with a relatively small number of annular elements to focus the beam in the axial direction, resulting in 2D ultrasonic images with significantly increased DOF (depth-of- focus). Even it is expected that heterogeneous and attenuating biological media will degrade annular array performance we proved an improvement in DOF with annular arrayfocusing. This likely indicates that focusing with our annular array is more effective in the far-field than in the near- field of the transducer. First, we made this comparison for simulated transducer with equal area and different number of elements (4, 6 and 8 ring annular arrays) and 3.25 MHz frequency. Second, the frequency was changed and the results were compared. Finally the results obtained were interpreted and discussed.
- Subjects
ULTRASONIC imaging; ACOUSTIC transducers; PARTICLE beam focusing; SIMULATION methods &; models; RAYLEIGH model
- Publication
Annals of the West University of Timisoara, Physics Series, 2011, Vol 55, p92
- ISSN
1224-9718
- Publication type
Article