Artículo
Dual k-space and image-space post-processing for field-cycling MRI under low magnetic field stability and homogeneity conditions
Fecha de publicación:
04/2022
Editorial:
Elsevier Science Inc.
Revista:
Magnetic Resonance Imaging
ISSN:
0730-725X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We present a method to correct artifacts typically present in images acquired in field-cycled MRI experiments under poor magnetic field spatial-homogeneity and time-stability conditions. The proposed method was tested in both simulated and experimental data. The experiments were performed using a fast field-cycling MRI relaxometer of own design, based on a current-driven variable-geometry electromagnet. Current instability-induced artifacts in the images were mitigated through a phase correction array resulted from entropy and background minimization. Image distortions due to magnetic field inhomogeneity were compensated through two different approaches, involving a previous determination of the magnetic field homogeneity-map, or an experimental protocol where two images are acquired with inverted readout gradient polarity. Results show that images acquired at extreme conditions can be successfully improved, thus strengthening the possibilities for both low-cost MRI devices and faster field-switched MRI systems.
Palabras clave:
BACKGROUND
,
ENTROPY
,
FIELD-CYCLING
,
FIELD-MAP
,
MRI
,
PHASE-SHIFTS
,
SSIM
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Articulos(IFEG)
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Citación
Rodriguez, Gonzalo G.; Salvatori, Alejandro; Anoardo, Esteban; Dual k-space and image-space post-processing for field-cycling MRI under low magnetic field stability and homogeneity conditions; Elsevier Science Inc.; Magnetic Resonance Imaging; 87; 4-2022; 157-168
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