Open AccessPhase‐apodisation technique to extend depth of field for high‐frequency ultrasound imaging
Author(s) -
Jeong J.S.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2013.2976
Subject(s) - transducer , concentric , phase (matter) , acoustics , depth of field , signal (programming language) , ultrasound , optics , signal to noise ratio (imaging) , materials science , computer science , physics , mathematics , geometry , quantum mechanics , programming language
The quality of focusing in high‐frequency ultrasound imaging is significantly affected by the length of the depth of field (DOF). A dual‐concentric transducer combined with a phase‐apodisation scheme is presented to achieve the extended DOF maintaining signal‐to‐noise ratio. As a preliminary study, computational simulation by using a Field‐II program is conducted to demonstrate the feasibility. A dual‐concentric transducer is composed of a disc‐ and a ring‐type element with confocal apertures. When two input signals with 0° and 180° phases are simultaneously applied to the inner and outer elements, a bifocal‐zone is generated in the axial direction. The overall − 6 dB DOF is 40% longer compared with a single element transducer. Thus, the proposed scheme can be a potential approach to increase the DOF for high‐frequency ultrasound imaging.