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Updated: Jun 13, 2026
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Three-dimensional Optical-resolution Photoacoustic Microscopy
Published on: May 3, 2011
Three-dimensional synthetic aperture focusing using a rocking convex array transducer.
Henrik Andresen1, Svetoslav Ivanov Nikolov, Mads Møller Pedersen
1Center for Fast UltrasoundImaging, DTU-Elektro, Technical University of Denmark, Lyngby, Denmark. henrikandr@gmail.com
Summary
Synthetic aperture focusing enhances elevation focus in volumetric imaging using convex rocking arrays. This method improves resolution and contrast, demonstrated through simulations and in vivo measurements.
Area of Science:
- Ultrasound imaging
- Medical physics
Background:
- Volumetric imaging with 1-D arrays and mechanical motion suffers from degraded resolution and contrast outside the elevation focus due to fixed transducer focus.
- This limitation impacts the quality of 3-D ultrasound data.
Purpose of the Study:
- To demonstrate the feasibility of synthetic aperture focusing for improving elevation focus in convex rocking array-based volumetric imaging.
- To enhance image resolution and contrast in the elevation dimension.
Main Methods:
- Utilized a virtual source (VS) for defocused multi-element transmit and another VS at the elevation focus point.
- Implemented a plane-wave VS approach to mitigate artifacts and boost signal-to-noise ratio (SNR) at the elevation VS.
- Calculated direct time-of-flight for 3-D points.
Main Results:
- Simulations showed an average resolution improvement of 26%.
- Experimental measurements with a convex rocking array achieved an average resolution improvement of 33%.
- Improvements in resolution and contrast were validated through in vivo measurements.
Conclusions:
- Synthetic aperture focusing effectively enhances elevation focus for convex rocking array volumetric imaging.
- The findings suggest potential for modified transducer designs to further improve 3-D imaging with better elevation focusing and contrast.
