Magnetic resonance imaging of the female pelvis. New circularly polarized body array coil versus standard body coil.
Invest Radiol
; 32(1): 1-6, 1997 Jan.
Article
em En
| MEDLINE
| ID: mdl-9007641
ABSTRACT
RATIONALE AND OBJECTIVES:
The authors compare the value of a new circularly polarized body array coil (BAC) system with a standard body coil (BC) for high-resolution magnetic resonance imaging of the female pelvis.METHODS:
Twenty patients with cervical cancer were examined with a BC and BAC. Imaging parameters were kept constant (sagittal T2-weighted turbo spin-echo repetition time = 4000 mseconds; effective echo time = 99 mseconds; 160 x 160 mm field of view; 256 x 256 matrix; 0.63 x 0.63 mm pixel size; 4-mm slice thickness). Images were scored for lesion-to-organ delineation and overall image quality/ artifacts using a scale from 5 to 1 (excellent to poor). Signal-to-noise (S/N) ratios for different tissues (tumor, uterus, vagina, rectum, muscle, and fat) as well as contrast-to-noise (C/N) ratios between tumor and (1) uterus, (2) vagina, and (3) rectum were calculated. Magnetic resonance tumor staging was performed according to the International Federation of Gynecology and Obstetrics (FIGO) classification.RESULTS:
Using the BAC, S/N and C/N ratios increased significantly compared with the BC (S/N 2.7-3.4-fold increase for all organs evaluated, P < 0.001 C/N tumor versus uterus 2.4-fold, P < 0.01; tumor versus vagina 6.1-fold, P < 0.001; tumor versus rectum 3.1-fold, P < 0.01). This resulted in an improved overall image quality (average ratings BAC-4.3 points; BC-2.6 points; P < 0.001). Lesion-to-organ delineation (average ratings BAC 4.3-4.1 points, BC 3.5-2.7 points for all organs evaluated; P < 0.001) was increased noticeably on BAC images. No significant difference was found for staging accuracy.CONCLUSIONS:
Circularly polarized BAC provide superior S/N and C/N ratios and improve lesion conspicuity compared with standard BC.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Pelve
/
Neoplasias Uterinas
/
Imageamento por Ressonância Magnética
Tipo de estudo:
Observational_studies
Limite:
Adult
/
Aged
/
Female
/
Humans
/
Middle aged
Idioma:
En
Ano de publicação:
1997
Tipo de documento:
Article