[MR mammography at 0.5 tesla. I. Comparison of image quality and sensitivity of MR mammography at 0.5 and 1.5 T]. / MR-Mammographie bei 0.5 Tesla. Teil I: Vergleich von Bildqualität und Sensitivität der MR-Mammographie bei 0.5 und 1.5 T.
Rofo
; 162(5): 381-9, 1995 May.
Article
en De
| MEDLINE
| ID: mdl-7772759
PURPOSE: To determine whether dynamic MR mammography is possible on midfield systems without loss of diagnostic sensitivity when compared to the standard highfield technique. MATERIALS AND METHODS: 42 consecutive patients were examined twice: Once using the standard dynamic 2D gradient echo technique at 1.5 T; a second examination was performed on a 0.5 T system. For the midfield examinations a 3D sequence with optimized T1 contrast was used to compensate for the shorter T1 relaxation times at 0.5 T. Subtraction images were calculated to improve detectability of enhancing lesions. RESULTS: Image quality was comparable on both systems. Mean enhancement of lesions was higher at 0.5 T/3D as compared to 1.5 T/2D (161% versus 112%). In malignant lesions, enhancement at 0.5 T/3D surpassed that at 1.5 T/2D in 88% of cases; average maximum signal intensity increase of cancers was significantly higher at 0.5 T/3D as compared to 1.5 T/2D (183% versus 108% relative to baseline). One satellite lesion of a recurrent carcinoma was detected on the 0.5 T/3D images only. CONCLUSION: A 3D gradient echo pulse sequence can be used to compensate for the T1 shortening effect of the lower field strength. With a 3D sequence, sensitivity of MRM at 0.5 T is even superior to that of the standard 2D highfield technique.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Mama
/
Enfermedades de la Mama
/
Imagen por Resonancia Magnética
Tipo de estudio:
Diagnostic_studies
/
Evaluation_studies
Límite:
Adult
/
Aged
/
Aged80
/
Female
/
Humans
/
Middle aged
Idioma:
De
Revista:
Rofo
Año:
1995
Tipo del documento:
Article
Pais de publicación:
Alemania