Motion estimation-based image enhancement in ultrasound imaging

Renaud Morin; Adrian Basarab; Stéphanie Bidon; Denis Kouamé

doi:10.1016/j.ultras.2015.02.003

Motion estimation-based image enhancement in ultrasound imaging

Ultrasonics. 2015 Jul:60:19-26. doi: 10.1016/j.ultras.2015.02.003. Epub 2015 Feb 21.

Authors

Renaud Morin¹, Adrian Basarab², Stéphanie Bidon³, Denis Kouamé²

Affiliations

¹ University of Toulouse, IRIT - UMR CNRS 5505, Toulouse, France; University of Dundee, Medical Research Institute, Ninewells Hospital & Medical School, Scotland, United Kingdom.
² University of Toulouse, IRIT - UMR CNRS 5505, Toulouse, France.
³ University of Toulouse, ISAE, Department of Electronics Optronics and Signal, Toulouse, France.

PMID: 25744943
DOI: 10.1016/j.ultras.2015.02.003

Abstract

High resolution medical ultrasound (US) imaging is an ongoing challenge in many diagnosis applications and can be achieved either by instrumentation or by post-processing. Though many works have considered the issue of resolution enhancement in optical imaging, very few works have investigated this issue in US imaging. In optics, several algorithms have been proposed to achieve super-resolution (SR) image reconstruction, which consists of merging several low resolution images to create a higher resolution image. However, the straightforward implementation of such techniques for US imaging is unsuccessful, due to the interaction of ultrasound with tissue and speckle. We show how to overcome the limit of SR in this framework by refining the registration part of common multiframe techniques. For this purpose, we investigate motion estimation methods adapted to US imaging. Performance of the proposed technique is evaluated on both realistic simulated US images (providing an estimated best-case performance) and real US sequences of phantom and in-vivo thyroid images. Compared to classical SR methods, our technique brings both quantitative and qualitative improvements. Resolution gain was found to be 1.41 for the phantom sequence and 1.12 for the thyroid sequence and a quantitative study using the phantom further confirmed the spatial resolution enhancement. Furthermore, the contrast-to-noise ratio was increased by 27% and 13% for simulated and experimental US images, respectively.

Keywords: Image enhancement; Image registration; Medical imaging; Super-resolution.