[Influence of sequence type on the extent of the susceptibility artifact in MRI--a shoulder specimen study after suture anchor repair]. / Abhängigkeit der Artefaktgrösse vom Sequenztyp in der MRT--Präparatstudie zur Beurteilung der postoperativen Schulter nach Labrumfixation.
Rofo
; 176(9): 1296-301, 2004 Sep.
Article
em De
| MEDLINE
| ID: mdl-15346265
ABSTRACT
PURPOSE:
To compare the extent of susceptibility artifacts after metallic suture anchor implantation by analyzing 14 different MRI sequences. MATERIALS ANDMETHODS:
A metallic suture anchor was implanted in the central area of three glenoid porcine specimens. The specimens were imaged with a 1.5 T scanner using a protocol of 14 standard sequences including gradient echo, spin echo and turbo spin echo sequences with and without fat-saturation. Artifact size was measured for each specimen and sequence. The resulting mean artifact areas were determined for each type of sequence and the mean values of the three specimens compared.RESULTS:
Gradient echo-sequences produced significantly larger artifact areas than the spin echo and turbo spin echo sequences, whereby the artifacts of the 3D-gradient echo sequences were smaller than the artifacts of the 2D-gradient echo sequences. A turbo spin echo sequence with a high readout band width and a short effective echo time showed the best results. For the conventional spin echo sequence, a reduction in the echo time did not significantly decrease the artifact size. Spectral fat-saturation did not affect the area of the susceptibility artifact compared to the non-saturated sequence.CONCLUSION:
Gradient echo sequences should not be used after metallic suture anchor repair. Turbo spin echo sequences showed a decrease in the artifact size compared to conventional spin echo sequences and should be performed with a short effective echo time and a high band width. Spectral fat- saturation did not increase the artifact size significantly.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ombro
/
Imageamento por Ressonância Magnética
/
Artefatos
Limite:
Animals
Idioma:
De
Revista:
Rofo
Ano de publicação:
2004
Tipo de documento:
Article