Accelerated whole‐heart MR angiography using a variable‐density poisson‐disc undersampling pattern and compressed sensing reconstruction

Purpose To accelerate whole‐heart three‐dimension MR angiography (MRA) by using a variable‐density Poisson‐disc undersampling pattern and a compressed sensing (CS) reconstruction algorithm, and compare the results with sensitivity encoding (SENSE). Methods For whole‐heart MRA, a prospective variable...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2018-02, Vol.79 (2), p.761-769
Main Authors: Moghari, Mehdi H., Uecker, Martin, Roujol, Sébastien, Sabbagh, Majid, Geva, Tal, Powell, Andrew J.
Format: Article
Language:English
Subjects:
Adolescent
Adult
Algorithms
Angiography
Child
Child, Preschool
compressed sensing
Density
Female
Heart
Heart - diagnostic imaging
Humans
Image processing
Image Processing, Computer-Assisted - methods
Image quality
Image reconstruction
Magnetic resonance
Magnetic Resonance Angiography - methods
Male
Medical imaging
Poisson Distribution
respiratory motion
self‐navigator
Sharpness
variable‐density undersampling
whole‐heart magnetic resonance angiography
Young Adult
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Summary:Purpose To accelerate whole‐heart three‐dimension MR angiography (MRA) by using a variable‐density Poisson‐disc undersampling pattern and a compressed sensing (CS) reconstruction algorithm, and compare the results with sensitivity encoding (SENSE). Methods For whole‐heart MRA, a prospective variable‐density Poisson‐disc k‐space undersampling pattern was developed in which 1–2% of central part of k‐space was fully sampled, and sampling in the remainder decreased exponentially toward the periphery. The undersampled data were then estimated using CS reconstruction. In patients, images using this sequence with an undersampling rate of ≈6 were compared with those using a SENSE rate of 2 (n = 15) and a SENSE rate of 6 (n = 13). Results Compared with SENSE rate 2, CS rate 6 images had similar objective border sharpness, significantly lower subjective image quality scores at all four locations (all P 
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.26730