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Proceedings Paper

Imposing spatio-temporal support in magnetic resonance angiographic imaging
Author(s): Philip J. Bones; Bahareh Vafadar; Richard Watts; Bing Wu
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Paper Abstract

A method to improve time resolution in 3D contrast-enhanced magnetic resonance angiography (CE-MRA) is proposed. A temporal basis based on prior knowledge of the contrast flow dynamics is applied to a sequence of image reconstructions. In CE-MRA a contrast agent (gadolinium) is injected into a peripheral vein and MR data is acquired as the agent arrives in the arteries and then the veins of the region of clinical interest. The acquisition extends over several minutes. Information is effectively measured in 3D k-space (spatial frequency space) one line at-atime. That line may be along a Cartesian grid line in k-space, a radial line or a spiral trajectory. A complete acquisition comprises many such lines but in order to improve temporal resolution, reconstructions are made from only partial sets of k-space data. By imposing a basis for the temporal changes, based on prior expectation of the smoothness of the changes in contrast concentration with time, it is demonstrated that a significant reduction in artifacts caused by the under-sampling of k-space can be achieved. The basis is formed from a set of gamma variate functions. Results are presented for a simulated set of 2D spiral-sampled CE-MRA data.

Paper Details

Date Published: 27 August 2010
PDF: 10 pages
Proc. SPIE 7800, Image Reconstruction from Incomplete Data VI, 780007 (27 August 2010); doi: 10.1117/12.861059
Show Author Affiliations
Philip J. Bones, Univ. of Canterbury (New Zealand)
Bahareh Vafadar, Univ. of Canterbury (New Zealand)
Richard Watts, Univ. of Canterbury (New Zealand)
Bing Wu, Duke Univ. (United States)

Published in SPIE Proceedings Vol. 7800:
Image Reconstruction from Incomplete Data VI
Philip J. Bones; Michael A. Fiddy; Rick P. Millane, Editor(s)

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