Abstract
A method to obtain a good compromise between the depth of field and the lateral resolution of “X waves” is proposed. The original X waves are theoretically nondiffracting beams generated by a specially phased infinite transmit aperture. When generated by a finite aperture, X waves are diffracting beams but have a large depth of field, maintaining uniform lateral field profiles. The proposed modification of the wave equation solution for X waves replaces a constant parameter representing the propagation angle of ultrasound with a function of radial distance at the aperture surface, and results in modified X waves that have a larger depth of field than the original X waves. Computer simulations show that a proper choice of the modification function can produce a new beam with improved field properties compared with the original X waves, promising images with higher lateral resolution and increased contrast over a large depth of field in high frame rate medical imaging. Experimental results are presented to verify the simulation results of the proposed method.
Original language | English (US) |
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Pages (from-to) | 36-47 |
Number of pages | 12 |
Journal | Ultrasonic Imaging |
Volume | 15 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1993 |
Keywords
- Annular array
- depth of field
- lateral resolution
- nondiffracting beams
- transmit focus
- ultrasonic B-mode imaging
ASJC Scopus subject areas
- Radiological and Ultrasound Technology
- Radiology Nuclear Medicine and imaging