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Image reconstruction for spiral scan...

University of Virginia.

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Image reconstruction for spiral scanning in magnetic resonance imaging.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Image reconstruction for spiral scanning in magnetic resonance imaging./
作者:	Chen, Weitian.
面頁冊數:	103 p.
附註:	Adviser: Craig H. Meyer.
Contained By:	Dissertation Abstracts International69-02B.
標題:	Engineering, Biomedical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3302228
ISBN:	9780549476269

Image reconstruction for spiral scanning in magnetic resonance imaging.
Chen, Weitian.

Image reconstruction for spiral scanning in magnetic resonance imaging. - 103 p.

Adviser: Craig H. Meyer.

Thesis (Ph.D.)--University of Virginia, 2008.

Spiral scanning is a valuable imaging method in magnetic resonance imaging (MRI). It can achieve high time- and SNR-efficiency in k-space sampling, good immunity to flow and motion effects, and excellent temporal resolution in dynamic imaging.

ISBN: 9780549476269Subjects--Topical Terms:

1017684
Engineering, Biomedical.

Image reconstruction for spiral scanning in magnetic resonance imaging.
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100 1 $a Chen, Weitian. $3 1035493
245 1 0 $a Image reconstruction for spiral scanning in magnetic resonance imaging.
300 $a 103 p.
500 $a Adviser: Craig H. Meyer.
500 $a Source: Dissertation Abstracts International, Volume: 69-02, Section: B, page: 1139.
502 $a Thesis (Ph.D.)--University of Virginia, 2008.
520 $a Spiral scanning is a valuable imaging method in magnetic resonance imaging (MRI). It can achieve high time- and SNR-efficiency in k-space sampling, good immunity to flow and motion effects, and excellent temporal resolution in dynamic imaging.
520 $a One significant drawback of spiral scanning is that off-resonance can cause image blurring. Correction of these artifacts requires an accurate field map, which is difficult to acquire in many applications. Automatic off-resonance correction methods can be used for image deblurring in spiral scanning without acquisition of a field map. However, these methods are prone to estimation errors. A technique developed in this dissertation is to combine conventional field map acquisition with automatic off-resonance correction to eliminate image blurring caused by off-resonance in spiral scanning.
520 $a Off-resonance can come from main field inhomogeneity, susceptibility induced field inhomogeneity, and concomitant gradient fields. Simultaneous correction of these off-resonance effects causes difficulties in image reconstruction. An efficient image reconstruction method based on a Chebyshev approximation to conjugate phase reconstruction is described to address this problem.
520 $a Spiral scanning can be combined with parallel imaging for further reduction of scan times. However, this technique is hindered by its complicated off-resonance effects. Off-resonance can not only cause image blurring but also interfere with the unaliasing process in spiral parallel imaging. We investigated off-resonance effects in spiral parallel imaging and described the correction methods.
520 $a With the tendency to increase receiver channels in MR systems to improve performance of parallel imaging, the computational cost of the existing reconstruction methods becomes a concern. An auto-calibrated parallel reconstruction method is proposed in this dissertation to address this problem. This technique can be applied for image reconstruction in spiral k-space sampling as well as Cartesian k-space sampling.
590 $a School code: 0246.
650 4 $a Engineering, Biomedical. $3 1017684
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