Improved compressed sensing reconstruction for [Formula: see text]F magnetic resonance imaging.
MAGMA
; 32(1): 63-77, 2019 Feb.
Article
in En
| MEDLINE
| ID: mdl-30604144
ABSTRACT
OBJECTIVE:
In magnetic resonance imaging (MRI), compressed sensing (CS) enables the reconstruction of undersampled sparse data sets. Thus, partial acquisition of the underlying k-space data is sufficient, which significantly reduces measurement time. While 19F MRI data sets are spatially sparse, they often suffer from low SNR. This can lead to artifacts in CS reconstructions that reduce the image quality. We present a method to improve the image quality of undersampled, reconstructed CS data sets. MATERIALS ANDMETHODS:
Two resampling strategies in combination with CS reconstructions are presented. Numerical simulations are performed for low-SNR spatially sparse data obtained from 19F chemical-shift imaging measurements. Different parameter settings for undersampling factors and SNR values are tested and the error is quantified in terms of the root-mean-square error.RESULTS:
An improvement in overall image quality compared to conventional CS reconstructions was observed for both strategies. Specifically spike artifacts in the background were suppressed, while the changes in signal pixels remained small.DISCUSSION:
The proposed methods improve the quality of CS reconstructions. Furthermore, because resampling is applied during post-processing, no additional measurement time is required. This allows easy incorporation into existing protocols and application to already measured data.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Computational Biology
/
Data Compression
/
Fluorine-19 Magnetic Resonance Imaging
/
Fluorine
Type of study:
Prognostic_studies
Limits:
Animals
/
Humans
Language:
En
Journal:
MAGMA
Journal subject:
DIAGNOSTICO POR IMAGEM
Year:
2019
Document type:
Article
Affiliation country:
Alemania