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Accuracy of magnetic resonance imaging for measuring maturing cartilage: A phantom study
McKinney, Jennifer R; Sussman, Marshall S; Moineddin, Rahim; Amirabadi, Afsaneh; Rayner, Tammy; Doria, Andrea S.
Afiliação
  • McKinney, Jennifer R; University of Toronto. The Hospital for Sick Children. Department of Diagnostic Imaging. Toronto. CA
  • Sussman, Marshall S; University of Toronto. The Hospital for Sick Children. Department of Diagnostic Imaging. Toronto. CA
  • Moineddin, Rahim; University of Toronto. The Hospital for Sick Children. Department of Diagnostic Imaging. Toronto. CA
  • Amirabadi, Afsaneh; University of Toronto. The Hospital for Sick Children. Department of Diagnostic Imaging. Toronto. CA
  • Rayner, Tammy; University of Toronto. The Hospital for Sick Children. Department of Diagnostic Imaging. Toronto. CA
  • Doria, Andrea S; University of Toronto. The Hospital for Sick Children. Department of Diagnostic Imaging. Toronto. CA
Clinics ; 71(7): 404-411, tab, graf
Artigo em Inglês | LILACS | ID: lil-787438
Biblioteca responsável: BR1.1
ABSTRACT

OBJECTIVES:

To evaluate the accuracy of magnetic resonance imaging measurements of cartilage tissue-mimicking phantoms and to determine a combination of magnetic resonance imaging parameters to optimize accuracy while minimizing scan time.

METHOD:

Edge dimensions from 4 rectangular agar phantoms ranging from 10.5 to 14.5 mm in length and 1.25 to 5.5 mm in width were independently measured by two readers using a steel ruler. Coronal T1 spin echo (T1 SE), fast spoiled gradient-recalled echo (FSPGR) and multiplanar gradient-recalled echo (GRE MPGR) sequences were used to obtain phantom images on a 1.5-T scanner.

RESULTS:

Inter- and intra-reader reliability were high for both direct measurements and for magnetic resonance imaging measurements of phantoms. Statistically significant differences were noted between the mean direct measurements and the mean magnetic resonance imaging measurements for phantom 1 when using a GRE MPGR sequence (512x512 pixels, 1.5-mm slice thickness, 549 min scan time), while borderline differences were noted for T1 SE sequences with the following parameters 320x320 pixels, 1.5-mm slice thickness, 611 min scan time; 320x320 pixels, 4-mm slice thickness, 611 min scan time; and 512x512 pixels, 1.5-mm slice thickness, 948 min scan time. Borderline differences were also noted when using a FSPGR sequence with 512x512 pixels, a 1.5-mm slice thickness and a 336 min scan time.

CONCLUSIONS:

FSPGR sequences, regardless of the magnetic resonance imaging parameter combination used, provided accurate measurements. The GRE MPGR sequence using 512x512 pixels, a 1.5-mm slice thickness and a 549 min scan time and, to a lesser degree, all tested T1 SE sequences produced suboptimal accuracy when measuring the widest phantom.
Assuntos


Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: LILACS Assunto principal: Imageamento por Ressonância Magnética / Cartilagem / Imagens de Fantasmas / Precisão da Medição Dimensional Tipo de estudo: Estudo de avaliação Idioma: Inglês Revista: Clinics Assunto da revista: Medicina Ano de publicação: 2016 Tipo de documento: Artigo País de afiliação: Canadá Instituição/País de afiliação: University of Toronto/CA

Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: LILACS Assunto principal: Imageamento por Ressonância Magnética / Cartilagem / Imagens de Fantasmas / Precisão da Medição Dimensional Tipo de estudo: Estudo de avaliação Idioma: Inglês Revista: Clinics Assunto da revista: Medicina Ano de publicação: 2016 Tipo de documento: Artigo País de afiliação: Canadá Instituição/País de afiliação: University of Toronto/CA
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