18840955

Source:http://linkedlifedata.com/resource/pubmed/id/18840955

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Predicate	Object
rdf:type	pubmed:Citation
lifeskim:mentions	umls-concept:C0025663, umls-concept:C0040405, umls-concept:C0442043, umls-concept:C2699488
pubmed:issue	9
pubmed:dateCreated	2008-10-8
pubmed:abstractText	In this study, we proposed a new method of measuring temporal resolution using an impulse signal in the time domain in computed tomography (CT). We employed a metal ball with a diameter of 11 mm as the source of the impulse signal, which was shot to a slice plane at a very fast speed during scanning, along the perpendicular direction to the plane. A 4-slice multi detector-row CT (MDCT) system was employed to evaluate the new method, and images for region of interest (ROI) measurement were reconstructed with a z-increment corresponding to a very short time (< or = 0.03 sec). Temporal sensitivity profiles (TSPs) for various helical beam-pitches were obtained by plotting averaged CT values within the ROIs against the temporal axis. The accuracy of the method was examined by comparing the measured TSPs with theoretical TSPs corresponding to respective helical beam-pitches. As a result, the theoretical TSPs and measured TSPs demonstrated high coincidence in all beam-pitches. Since the TSPs indicated the profiles with sharp shapes faithful to the theoretical TSPs, it was proved that the new method had sufficient inherent temporal resolution. It was indicated that the new method we proposed would be an effective method for evaluating temporal resolution in CT.
pubmed:language	jpn
pubmed:journal	http://linkedlifedata.com/resource/pubmed/journal/7505722
pubmed:citationSubset	IM
pubmed:status	MEDLINE
pubmed:month	Sep
pubmed:issn	0369-4305
pubmed:author	pubmed-author:HaraTakanoriT, pubmed-author:IchikawaKatsuhiroK, pubmed-author:NiwaShinjiS, pubmed-author:OhashiKazuyaK, pubmed-author:TakadaTadanoriT
pubmed:issnType	Print
pubmed:day	20
pubmed:volume	64
pubmed:owner	NLM
pubmed:authorsComplete	Y
pubmed:pagination	1172-6
pubmed:dateRevised	2011-7-28
pubmed:meshHeading	pubmed-meshheading:18840955-Time, pubmed-meshheading:18840955-Tomography, X-Ray Computed
pubmed:year	2008
pubmed:articleTitle	[A new method of measuring temporal resolution for computed tomography].
pubmed:affiliation	Graduate School of Medical Science, Kanazawa University.
pubmed:publicationType	Journal Article, English Abstract