[The study of the MRI artifacts caused by keepers].
OBJECTIVE
The aim of this research was to observe the extension of MRI artifacts caused by keepers.


METHODS
Five samples were imaged in a water phantom and a living human subject by 0.15 Tesla magnetic resonance devices. The maximum diameters of artifacts were measured and compared.


RESULTS
The maximal diameters of the artifacts caused by disc-shaped and post-shaped keepers were 95.5mm and 139.4mm.


CONCLUSIONS
Compared with the post-type keeper, the artifacts caused by disc-type keepers diminished significantly, and the difference of the maximal diameter reached statistical significance.
Department of Prosthodontics, School of Stomatology, Ninth People's Hospital, Shanghai Second Medical University, Shanghai 200011, China.
Bin
B
Wei
Fu-qiang
FQ
Zhang
Qiang
Q
Yu