Alles, E;
Mackle, E;
Noimark, S;
Desjardins, A;
(2021)
Direct Model-Based Inversion for Improved Freehand Optical Ultrasound Imaging.
In:
Proceedings of the 2021 IEEE International Ultrasonics Symposium (IUS 2021).
IEEE: Virtual symposium.
(In press).
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Abstract
Optical ultrasound imaging uses light to both generate and detect pulse-echo ultrasound. Recently, we presented a fibre-optic optical ultrasound imaging probe comprising 64 sources and a single receiver that allowed for video-rate, freehand imaging. However, its low number of sources limited the image contrast when using Delay-and-Sum reconstruction. Here, we present an alternative image formation paradigm for optical ultrasound based on model-based inversion, where the low number of sources allows for direct (i.e., non-iterative) inversion under modest hardware requirements. The model accurately incorporates the aperture geometry, frequency-dependent source directivity, and performance variation across the aperture, thereby reducing image artefacts associated with these properties. The method achieves a 15 dB gain in image contrast compared to Delay-and-Sum, at a similar image formation time.
| Type: | Proceedings paper |
|---|---|
| Title: | Direct Model-Based Inversion for Improved Freehand Optical Ultrasound Imaging |
| Event: | 2021 IEEE International Ultrasonics Symposium (IUS 2021) |
| Location: | Xian, China |
| Dates: | 11 September 2021 - 16 September 2021 |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | https://2021.ieee-ius.org/ |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Model-based inversion, optical ultrasound, image formation, singular value decomposition, regularisation |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10136799 |
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