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Conference Paper: A modified synthetic aperture imaging approach with axial motion compensation

TitleA modified synthetic aperture imaging approach with axial motion compensation
Authors
KeywordsCyst imaging experiment
Interleaved firing
Motion compensation
Synthetic aperture imaging
Tissue-cyst contrast
Issue Date2008
Citation
Proceedings - Ieee Ultrasonics Symposium, 2008, p. 1254-1257 How to Cite?
AbstractSynthetic aperture (SA) imaging provides an alternate mean of obtaining ultrasound images. However, since this approach is based on coherent summation of low-resolution images (LRIs) acquired from different point sources along an array, its image quality may be degraded if motion is present in between firings. In this work, we report a modified SA imaging scheme that can compensate for the effects of axial motion on the image quality. The scheme first acquires data by making use of an interleaved firing sequence where a center-point firing is carried out in between each point-source firing. It then estimates the mean axial shift between two LRIs by performing a crosscorrelation analysis on the raw channel data of successive centerpoint firings. The LRI of each point-source firing is then axially counter-shifted by the estimated shift value to compensate for possible aberration during SA image formation. To test out our proposed scheme, we conducted a tissue-cyst phantom imaging experiment, where raw channel data was acquired using our interleaved firing scheme for 97 virtual point sources laterally spaced apart at 0.3mm and axially located at 10mm behind the probe. This data acquisition procedure was repeated for a range of inter-firing probe displacements (15-90 μm) introduced via a motion stage. From the acquired data, motion-compensated SA images were formed using our modified image formation method, and their contrast was compared to those formed without motion compensation. Results show that our proposed scheme reduced the amount of blurring seen in SA images when uniform axial motion is present during data acquisition. Without motion compensation, the contrast level for the phantom cysts can drop by 15-20dB (relative to the SA image taken without motion) for the range of inter-firing displacements examined. When our motion compensation strategy was applied, this contrast drop was less than 5dB. © 2008 IEEE.
DescriptionIEEE Ultrasonics Symposium
Persistent Identifierhttp://hdl.handle.net/10722/62032
ISSN
References

 

DC FieldValueLanguage
dc.contributor.authorYiu, BYSen_HK
dc.contributor.authorTsang, IKHen_HK
dc.contributor.authorYu, ACHen_HK
dc.date.accessioned2010-07-13T03:52:30Z-
dc.date.available2010-07-13T03:52:30Z-
dc.date.issued2008en_HK
dc.identifier.citationProceedings - Ieee Ultrasonics Symposium, 2008, p. 1254-1257en_HK
dc.identifier.issn1051-0117en_HK
dc.identifier.urihttp://hdl.handle.net/10722/62032-
dc.descriptionIEEE Ultrasonics Symposiumen_HK
dc.description.abstractSynthetic aperture (SA) imaging provides an alternate mean of obtaining ultrasound images. However, since this approach is based on coherent summation of low-resolution images (LRIs) acquired from different point sources along an array, its image quality may be degraded if motion is present in between firings. In this work, we report a modified SA imaging scheme that can compensate for the effects of axial motion on the image quality. The scheme first acquires data by making use of an interleaved firing sequence where a center-point firing is carried out in between each point-source firing. It then estimates the mean axial shift between two LRIs by performing a crosscorrelation analysis on the raw channel data of successive centerpoint firings. The LRI of each point-source firing is then axially counter-shifted by the estimated shift value to compensate for possible aberration during SA image formation. To test out our proposed scheme, we conducted a tissue-cyst phantom imaging experiment, where raw channel data was acquired using our interleaved firing scheme for 97 virtual point sources laterally spaced apart at 0.3mm and axially located at 10mm behind the probe. This data acquisition procedure was repeated for a range of inter-firing probe displacements (15-90 μm) introduced via a motion stage. From the acquired data, motion-compensated SA images were formed using our modified image formation method, and their contrast was compared to those formed without motion compensation. Results show that our proposed scheme reduced the amount of blurring seen in SA images when uniform axial motion is present during data acquisition. Without motion compensation, the contrast level for the phantom cysts can drop by 15-20dB (relative to the SA image taken without motion) for the range of inter-firing displacements examined. When our motion compensation strategy was applied, this contrast drop was less than 5dB. © 2008 IEEE.en_HK
dc.languageengen_HK
dc.relation.ispartofProceedings - IEEE Ultrasonics Symposiumen_HK
dc.subjectCyst imaging experimenten_HK
dc.subjectInterleaved firingen_HK
dc.subjectMotion compensationen_HK
dc.subjectSynthetic aperture imagingen_HK
dc.subjectTissue-cyst contrasten_HK
dc.titleA modified synthetic aperture imaging approach with axial motion compensationen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailYu, ACH:alfred.yu@hku.hken_HK
dc.identifier.authorityYu, ACH=rp00657en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1109/ULTSYM.2008.0303en_HK
dc.identifier.scopuseid_2-s2.0-67649331454en_HK
dc.identifier.hkuros153469en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-67649331454&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.spage1254en_HK
dc.identifier.epage1257en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridYiu, BYS=26657783600en_HK
dc.identifier.scopusauthoridTsang, IKH=26657657600en_HK
dc.identifier.scopusauthoridYu, ACH=8699317700en_HK

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