Abstract
Transcranial ultrasound imaging is a suitable technology for diagnosis of strokes as it is safe, portable, relatively inexpensive and available in emergency medicine services, however it currently offers poor image quality due to the phase aberration caused by the human skull. In this work, we evaluate an approach for two-dimensional transcranial ultrasound imaging through the temporal window of a sagittally-cut human skull using the commercial P4-1 phased-array probe, where the position and true geometry of the bone layer is estimated for accurate phase aberration correction. The medium is described with four layers (probe lens, soft tissue, skull, soft tissue). A synthetic aperture imaging scheme is used as the transmission of spherical wave-fronts facilitates the modeling of refraction. First, the bidirectional headwave method estimates the compressional wave-speed in the temporal bone. Next, a fast marching method calculates the travel times between individual array elements and image pixels to be used with delay-and-sum reconstruction algorithm. Sound speed maps are generated with adaptive beamforming including the successive segmentation of the near and far surfaces of the cortical bone layer. The proposed method reconstructs the scatterers with an average lateral and axial localization error of about 1.25 mm and 0.37 mm, compared to the ground truth, respectively. In average, it improves the contrast ratio and lateral resolution by 7 dB and 36%, compared to the conventional method, respectively.
Original language | English |
---|---|
Title of host publication | 2021 IEEE International Ultrasonics Symposium (IUS) |
Subtitle of host publication | Proceedings |
Place of Publication | Piscataway |
Publisher | IEEE |
Pages | 1-4 |
Number of pages | 4 |
ISBN (Electronic) | 978-1-6654-0355-9 |
ISBN (Print) | 978-1-6654-4777-5 |
DOIs | |
Publication status | Published - 2021 |
Event | 2021 IEEE International Ultrasonics Symposium (IUS) - Virtual at Xi'an, China Duration: 11 Sept 2021 → 16 Sept 2021 |
Publication series
Name | IEEE International Ultrasonics Symposium, IUS |
---|---|
ISSN (Print) | 1948-5719 |
Conference
Conference | 2021 IEEE International Ultrasonics Symposium (IUS) |
---|---|
Abbreviated title | IUS 2021 |
Country/Territory | China |
City | Virtual at Xi'an |
Period | 11/09/21 → 16/09/21 |
Bibliographical note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Keywords
- Adaptive beamforming
- Head wave
- Phase aberration correction
- Temporal bone
- Transcranial ultrasound imaging