[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.
Wei
Bin
B
Department of Prosthodontics, School of Stomatology, Ninth People's Hospital, Shanghai Second Medical University, Shanghai 200011, China.
Zhang
Fu-qiang
FQ
Yu
Qiang
Q