Journal article
The effects of K-space data undersampling and discontinuities in keyhole functional MRI
Magnetic resonance imaging, Vol.17(1), pp.109-119
1999
DOI: 10.1016/S0730-725X(98)00147-7
PMID: 9888404
Abstract
The effects of the k-space data undersampling and the discontinuities associated with the keyhole approach in functional magnetic resonance imaging (fMRI) have been addressed. Undersampling of high k-space data increases the high spatial-frequency noise by a factor of
m
, where
m is the number of images sharing the high k-space data. However, the effects of the noise can be effectively removed using clustered-pixel statistical analysis. The amplitude and phase discontinuities may result in an increase in the low spatial-frequency noise level, which has no impact on specificity and only a minimal impact on sensitivity. Although dramatically reducing acquisition time and preserving the spatial resolution of functional magnetic resonance imaging, the keyhole technique may have a limited capability in detecting highly focal activations.
Details
- Title: Subtitle
- The effects of K-space data undersampling and discontinuities in keyhole functional MRI
- Creators
- Jinhu Xiong - Research Imaging Center, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USAPeter T Fox - Research Imaging Center, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USAJia-Hong Gao - Research Imaging Center, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
- Resource Type
- Journal article
- Publication Details
- Magnetic resonance imaging, Vol.17(1), pp.109-119
- DOI
- 10.1016/S0730-725X(98)00147-7
- PMID
- 9888404
- NLM abbreviation
- Magn Reson Imaging
- ISSN
- 0730-725X
- eISSN
- 1873-5894
- Publisher
- Elsevier Inc
- Language
- English
- Date published
- 1999
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering
- Record Identifier
- 9984083878802771
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