ArticleMagnetic resonance in medicine2016
Improvement of temporal signal-to-noise ratio of GRAPPA accelerated echo planar imaging using a FLASH based calibration scan.
Article in Magnetic resonance in medicine, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 31 papers.
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31 citing papers in PubMed.
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- Assessing Cerebral Microvascular Volumetric Pulsatility with High-Resolution 4D CBV MRI at 7T.medRxiv : the preprint server for health sciences · 2024Article
- Denoising parameter dependence of coronary artery depictability in compressed sensing magnetic resonance angiography.Radiological physics and technology · 2024Article
- Thermal stimulus task fMRI in the cervical spinal cord at 7 Tesla.Human brain mapping · 2024Article
- Characterisation of laminar and vascular spatiotemporal dynamics of CBV and BOLD signals using VASO and ME-GRE at 7T in humans.bioRxiv : the preprint server for biology · 2024Article
- Customization of neonatal functional magnetic resonance imaging: A preclinical phantom-based study.PloS one · 2024Article
- Characterisation of laminar and vascular spatiotemporal dynamics of CBV and BOLD signals using VASO and ME-GRE at 7T in humans.Imaging neuroscience (Cambridge, Mass.) · 2024Article
- Imaging the columnar functional organization of human area MT+ to axis-of-motion stimuli using VASO at 7 Tesla.Cerebral cortex (New York, N.Y. : 1991) · 2023Article
- Impact of autocalibration method on accelerated EPI of the cervical spinal cord at 7 T.Magnetic resonance in medicine · 2022Article
- Layer-dependent functional connectivity methods.Progress in neurobiology · 2021Review
- Rapid head-pose detection for automated slice prescription of fetal-brain MRI.International journal of imaging systems and technology · 2021Article
- High-resolution fMRI at 7 Tesla: challenges, promises and recent developments for individual-focused fMRI studies.Current opinion in behavioral sciences · 2021Article
- Robust autocalibrated structured low-rank EPI ghost correction.Magnetic resonance in medicine · 2021Article
- Noise power spectrum in compressed sensing magnetic resonance imaging.Radiological physics and technology · 2021Article
- Sub-millimetre resolution laminar fMRI using Arterial Spin Labelling in humans at 7 T.PloS one · 2021Article
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Abstract
purposeTo demonstrate that the temporal signal-to-noise ratio (SNR) of generalized autocalibrating partially parallel acquisitions (GRAPPA) accelerated echo planar imaging (EPI) can be enhanced and made more spatially uniform by using a fast low angle shot (FLASH) based calibration scan.
methodsEPI of a phantom and human brains were acquired at 3 Tesla without and with GRAPPA acceleration factor of 2. The GRAPPA accelerated data were reconstructed using calibration scans acquired with EPI and FLASH acquisition schemes. The increase in temporal signal fluctuation due to GRAPPA reconstruction was quantified and compared. Simulated g-factor maps were also created for different calibration scans.
resultsGRAPPA accelerated phantom data exhibited areas with high g values when using the EPI based calibration for reconstruction. The g-factor maps were uniform when using the FLASH calibration scan. g was greater than 1.1 in 74% of pixels in 64 × 64 data reconstructed with the EPI calibration compared with only 15% when using the FLASH calibration scan. Human data also showed abnormally high g regions when using the EPI calibration but not when using the FLASH calibration scan. Use of the FLASH calibration scan increased the whole brain temporal SNR by ∼12% without affecting the image quality. Experimental observations were confirmed by simulations.
conclusionA calibration scan based on a FLASH acquisition scheme can be used to improve the temporal SNR of GRAPPA accelerated EPI time series. Magn Reson Med 75:2362-2371, 2016. Published 2015. This article is a U.S. Government work and is in the public domain in the USA.
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