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Truncation artifact reduction in spectroscopic imaging using a dual-density spiral k-space trajectory.

Abstract：

:Truncation artifacts arise in magnetic resonance spectroscopic imaging (MRSI) of the human brain due to limited coverage of k-space necessitated by low SNR of metabolite signal and limited scanning time. In proton MRSI of the head, intense extra-cranial lipid signals "bleed" into brain regions, thereby contaminating signals of metabolites therein. This work presents a data acquisition strategy for reducing truncation artifact based on extended k-space coverage achieved with a dual-SNR strategy. Using the fact that the SNR in k-space increases monotonically with sampling density, dual-SNR is achieved in an efficient manner with a dual-density spiral k-space trajectory that permits a smooth transition from high density to low density. The technique is demonstrated to be effective in reducing "bleeding" of extra-cranial lipid signals while preserving the SNR of metabolites in the brain.

journal_name

Magn Reson Imaging

journal_title

Magnetic resonance imaging

authors

Sarkar S,Heberlein K,Hu X

doi

10.1016/s0730-725x(02)00608-2

subject

Has Abstract

pub_date

2002-12-01 00:00:00

pages

743-57

issue

10

eissn

0730-725X

issn

1873-5894

pii

S0730725X02006082

journal_volume

20

pub_type

杂志文章

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