DocumentCode :
899655
Title :
Computation of Transmitted and Received 
Fields in Magnetic Resonance Imaging
Fields in Magnetic Resonance ImagingAuthor :
Milles, J. ; Yue Min Zhu ; Nan-Kuei Chen ; Panych, L.P. ; Gimenez, G. ; Guttmann, C.R.G.
Author_Institution :
INSA, Villeurbanne
Volume :
53
Issue :
5
fYear :
2006
fDate :
5/1/2006 12:00:00 AM
Firstpage :
885
Lastpage :
895
Abstract :
Computation of B1 fields is a key issue for determination and correction of intensity nonuniformity in magnetic resonance images. This paper presents a new method for computing transmitted and received B1 fields. Our method combines a modified MRI acquisition protocol and an estimation technique based on the Levenberg-Marquardt algorithm and spatial filtering. It enables accurate estimation of transmitted and received B1 fields for both homogeneous and heterogeneous objects. The method is validated using numerical simulations and experimental data from phantom and human scans. The experimental results are in agreement with theoretical expectations
Keywords :
biomedical MRI; medical image processing; phantoms; spatial filters; Levenberg-Marquardt algorithm; human scans; magnetic resonance imaging; phantom; received B1 fields; spatial filtering; transmitted B1 fields; Biomedical imaging; Coils; Filtering; Finite difference methods; Hospitals; Magnetic resonance imaging; Magnetic separation; Milling machines; Radiology; Time domain analysis; Intensity nonuniformity; magnetic resonance imaging; nonlinear inversion; spatial filtering; transmitted and received; Algorithms; Artifacts; Brain; Electromagnetic Fields; Humans; Image Enhancement; Image Interpretation, Computer-Assisted; Imaging, Three-Dimensional; Magnetic Resonance Imaging; Reproducibility of Results; Sensitivity and Specificity;
fLanguage :
English
Journal_Title :
Biomedical Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9294
Type :
jour
DOI :
10.1109/TBME.2005.863955
Filename :
1621140
Link To Document :
