PCA-based magnetic field modeling: application for on-line MR temperature monitoring.
Med Image Comput Comput Assist Interv
; 10(Pt 2): 411-9, 2007.
Article
em En
| MEDLINE
| ID: mdl-18044595
ABSTRACT
Magnetic Resonance (MR) temperature mapping can be used to monitor temperature changes during minimally invasive thermal therapies. However, MR-thermometry contains artefacts caused by phase errors induced by organ motion in inhomogeneous magnetic fields. This paper proposes a novel correction strategy based on a Principal Component Analysis (PCA) to estimate magnetic field perturbation assuming a linear magnetic field variation with organ displacement. The correction method described in this paper consists of two steps:
a magnetic field perturbation model is computed in a learning step; subsequently, during the intervention, this model is used to reconstruct the magnetic field perturbation corresponding to the actual organ position which in turns allow computation of motion corrected thermal maps.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Temperatura Corporal
/
Algoritmos
/
Imageamento por Ressonância Magnética
/
Interpretação de Imagem Assistida por Computador
/
Termografia
/
Abdome
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
Med Image Comput Comput Assist Interv
Ano de publicação:
2007
Tipo de documento:
Article