On shimming approaches in 3T breast MRI.
Magn Reson Med
; 69(3): 862-7, 2013 Mar 01.
Article
en En
| MEDLINE
| ID: mdl-22556115
ABSTRACT
A comparative study is presented, analyzing quantitatively the impact of 15 shim strategies on the homogeneity of the main magnetic field over the three-dimensional breast region in 3T MRI. The results obtained in 12 female volunteers, spanning a wide range of body and breast types, indicate that the inclusion of the back and heart in the shim region of interest leads to considerable decrease in field homogeneity, and needs to be avoided. Comparison between shim strategies using volumetric B(0) maps, covering the entire breast region, and 1-6 plane B(0) maps indicate only minimally reduced performance for the latter. Interestingly, however, no single shim strategy relying on a limited number of B(0) maps as input was found to work best in all volunteers. This was attributed to the limited capability of a small number of B(0) maps to capture the B(0) variability existent within breast. On the average, a rectangular shim region of interest, encompassing the breast region alone, worked best for the cohort studied here.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Algoritmos
/
Mama
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Imagen por Resonancia Magnética
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Interpretación de Imagen Asistida por Computador
/
Aumento de la Imagen
Tipo de estudio:
Diagnostic_studies
Límite:
Adolescent
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Adult
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Female
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Humans
Idioma:
En
Revista:
Magn Reson Med
Asunto de la revista:
DIAGNOSTICO POR IMAGEM
Año:
2013
Tipo del documento:
Article
País de afiliación:
Estados Unidos