TY - GEN
T1 - Numerical Investigation of Multiple Scattering and Mode-Converted Shear Waves Caused by Temporal Bone in Transcranial Photoacoustic Imaging
AU - Hosseini, Fatemeh
AU - Mozaffarzadeh, Moein
AU - Mahlooiifar, Ali
AU - Verweij, Martin D.
AU - De Jong, Nico
N1 - 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.
PY - 2022
Y1 - 2022
N2 - In recent years, transcranial photoacoustic (TPA) imaging has become a popular modality for diagnosis of brain disorders. However, due to the presence of skull, TPA images are strongly degraded. Acoustically, this degradation is mainly categorized into the phase aberration, mode-converted shear waves, and multiple scattering. Previous studies numerically investigated the effects of mode-converted shear waves and multiple scattering on TPA images while the phase aberration caused by the skull was ignored and a conventional delay-and-sum method was employed for reconstructing TPA images. In this paper, we investigate these effects while a refraction-corrected image reconstruction approach is used to form TPA images. This approach enables separating the effects of phase aberration, mode-converted shear wave and multiple scattering. A realistic human temporal bone based on a MicroCT was used in the numerical model. In average for all the absorbers, the power of the artifacts caused by the mode-converted shear wave and multiple scattering are -13.7 dB and -20.1 dB when the refraction is corrected during image formation, respectively. These values were -7.9 and -18.8 if the conventional reconstruction is used. Accounting for phase aberration enables accurate quantification of the effects of the mode-converted shear waves and multiple scattering, which is necessary for evaluating the methods developed for degrading these effects.
AB - In recent years, transcranial photoacoustic (TPA) imaging has become a popular modality for diagnosis of brain disorders. However, due to the presence of skull, TPA images are strongly degraded. Acoustically, this degradation is mainly categorized into the phase aberration, mode-converted shear waves, and multiple scattering. Previous studies numerically investigated the effects of mode-converted shear waves and multiple scattering on TPA images while the phase aberration caused by the skull was ignored and a conventional delay-and-sum method was employed for reconstructing TPA images. In this paper, we investigate these effects while a refraction-corrected image reconstruction approach is used to form TPA images. This approach enables separating the effects of phase aberration, mode-converted shear wave and multiple scattering. A realistic human temporal bone based on a MicroCT was used in the numerical model. In average for all the absorbers, the power of the artifacts caused by the mode-converted shear wave and multiple scattering are -13.7 dB and -20.1 dB when the refraction is corrected during image formation, respectively. These values were -7.9 and -18.8 if the conventional reconstruction is used. Accounting for phase aberration enables accurate quantification of the effects of the mode-converted shear waves and multiple scattering, which is necessary for evaluating the methods developed for degrading these effects.
KW - Mode-converted shear waves
KW - Multiple scattering
KW - Phase aberration correction
KW - Temporal bone
KW - Transcranial photoacoustic imaging
UR - http://www.scopus.com/inward/record.url?scp=85143791708&partnerID=8YFLogxK
U2 - 10.1109/IUS54386.2022.9957367
DO - 10.1109/IUS54386.2022.9957367
M3 - Conference contribution
AN - SCOPUS:85143791708
T3 - IEEE International Ultrasonics Symposium, IUS
BT - IUS 2022 - IEEE International Ultrasonics Symposium
PB - IEEE
T2 - 2022 IEEE International Ultrasonics Symposium, IUS 2022
Y2 - 10 October 2022 through 13 October 2022
ER -