Conference paper
A comparison between image and signal sharpness-based axial localization of ultrasound scatterers
University of Edinburgh1
Heriot-Watt University2
Center for Fast Ultrasound Imaging, Biomedical Engineering, Department of Health Technology, Technical University of Denmark3
Biomedical Engineering, Department of Health Technology, Technical University of Denmark4
Department of Health Technology, Technical University of Denmark5
Super-resolution ultrasound imaging deploys contrast microbubble (MB) tracking to delineate micro-vessels. The potential application spans to a large number of diseases which cause compromised vascular networks. Current super resolution methods are mainly based on image processing. Sharpness-based localization is an alternative to such methods for scatterer localization in the axial direction, and can be implemented using both image and signal data.
A 7-MHz, linear ultrasound transducer (lambda=212 mu m) and the Synthetic Aperture Real-time Ultrasound System (SARUS) were used to image a wire-target (point scatterer) at different depth positions. The method predicts a depth estimate and its difference from the true scatterer position demonstrates its accuracy.
This average difference can be as low as 27.41 mu m (or approximate to lambda/8) for the image-derived sharpness and drops to 2.84 mu m (or approximate to lambda/75) when the signals are used. These figures were calculated for a 8 mm depth range, which can be extended subject to further processing. The process of image formation involves interpolation and logarithmic compression that reduce the overall performance of the method when using image data.
Such details may be significant when reconstructing micro-vessels of the order of tens of micrometres in diameter.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2019 |
| Pages: | 1610-1613 |
| Proceedings: | 2019 IEEE International Symposium on Biomedical Imaging |
| Series: | International Symposium on Biomedical Imaging. Proceedings |
| ISBN: | 1538636417 , 1538636425 , 9781538636411 and 9781538636428 |
| ISSN: | 19458452 and 19457928 |
| Types: | Conference paper |
| DOI: | 10.1109/ISBI.2019.8759225 |
| ORCIDs: | Jensen, Jørgen Arendt |
Axial localization Multiple focusing Sharpness Super-resolution ultrasound Ultrasound scatterers
Image resolution Imaging Signal resolution Standards Ultrasonic imaging Ultrasonic variables measurement Wires biomedical transducers biomedical ultrasonics contrast microbubble diseases frequency 7 MHz image data image formation image processing image reconstruction image resolution image sharpness-based axial localization image-derived sharpness linear ultrasound transducer medical image processing microvessel reconstruction multiple focusing point scatterer scatterer localization scatterer position sharpness signal data signal sharpness-based axial localization size 8.0 mm super-resolution ultrasound superresolution methods superresolution ultrasound imaging synthetic aperture real-time ultrasound system ultrasonic transducers ultrasound scatterers vascular networks wavelength 212.0 mum
