https://scholars.lib.ntu.edu.tw/handle/123456789/484614
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.author | PAI-CHI LI | en_US |
dc.contributor.author | Huang, J.-J. | en_US |
dc.contributor.author | Liu, H.-L. | en_US |
dc.contributor.author | O'Donnell, M. | en_US |
dc.creator | Li, P.-C.;Huang, J.-J.;Liu, H.-L.;O'Donnell, M. | - |
dc.date.accessioned | 2020-04-16T02:35:47Z | - |
dc.date.available | 2020-04-16T02:35:47Z | - |
dc.date.issued | 2000 | - |
dc.identifier.issn | 01617346 | - |
dc.identifier.uri | https://scholars.lib.ntu.edu.tw/handle/123456789/484614 | - |
dc.identifier.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-0034447771&doi=10.1177%2f016173460002200401&partnerID=40&md5=1414915e797bef6a15480c0d7b8ba457 | - |
dc.description.abstract | Beamformation using oversampling delta-sigma (ΔΣ) modulators has been proposed for diagnostic ultrasound. Such a beamformer can reduce the size, complexity and cost of an imaging system while providing adequate signal-to-quantization noise ratio (SQNR). High quality images can also be generated if dynamic receive delays are applied correctly. Several dynamic focusing techniques were previously proposed. Generally, an additional bit or extra compensation circuit is required to preserve the power and frequency distribution of the signal. Without preserving the power and frequency distribution, the image background noise is increased. In this paper, an alternative technique is presented. The new technique exploits the symmetry of focusing delays relative to the center of a transducer array. By properly synchronizing the delays and selecting the inserted values, no noise is added to the beam sum signal and the image background level is not increased. Using real ultrasound data, it is shown that the proposed technique provides the same imaging performance as the previous approaches with reduced system complexity by using only a single bit to encode the output of the ΔΣ modulator. | - |
dc.relation.ispartof | Ultrasonic Imaging | - |
dc.subject | Beam formation; Dynamic focusing; Oversampling A/D; Ultrasonic imaging; ΔΣmodulator | - |
dc.subject.other | Beamforming; Imaging systems; Modulators; Quantization (signal); Ultrasonic imaging; Beam formation; Compensation circuits; Delta sigma modulator; Diagnostic ultrasound; Dynamic focusing; Frequency distributions; Over sampling; Signal to quantization noise ratios; Focusing; article; dynamics; imaging system; mathematical analysis; signal noise ratio; time; transducer; ultrasound | - |
dc.title | A dynamic focusing technique for delta-sigma-based beamformers | en_US |
dc.type | journal article | en |
dc.identifier.doi | 10.1177/016173460002200401 | - |
dc.identifier.pmid | 11370903 | - |
dc.identifier.scopus | 2-s2.0-0034447771 | - |
dc.relation.pages | 197-205 | - |
dc.relation.journalvolume | 22 | - |
dc.relation.journalissue | 4 | - |
item.fulltext | no fulltext | - |
item.openairecristype | http://purl.org/coar/resource_type/c_6501 | - |
item.cerifentitytype | Publications | - |
item.openairetype | journal article | - |
item.grantfulltext | none | - |
crisitem.author.dept | Biomedical Electronics and Bioinformatics | - |
crisitem.author.dept | Electrical Engineering | - |
crisitem.author.orcid | 0000-0001-7603-7852 | - |
crisitem.author.parentorg | College of Electrical Engineering and Computer Science | - |
crisitem.author.parentorg | College of Electrical Engineering and Computer Science | - |
顯示於: | 生醫電子與資訊學研究所 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。