Keywords:
Artifacts, Safety, Removal, Audit and standards, MR, Paediatric, Neuroradiology brain, MR physics
Authors:
A. Heinrich1, P. Kaleth2, C. Finke2, F. V. Güttler1, M. de Bucourt2, U. K. M. Teichgräber1; 1Jena/DE, 2Berlin/DE
DOI:
10.26044/ecr2019/C-2189
Methods and materials
For this study different pre-fabricated pediatric stainless steel crowns (type 304,
316,
316L,
see Fig. 1) for the maxillary left first and second deciduous molars from three manufacturers (3M Espe,
Acero XT,
Denovo Dental) were compared on a 1.5 T and 3 T MRI (Magnetom Avanto and Prisma,
Siemens,
Erlangen,
Germany).
Fig. 1: Crowns in untreated (a), trimmed (b) and bent (c) condition.
References: Andreas Heinrich, Department of Radiology, University Hospital Jena - Jena/DE
The signal loss was measured according to ASTM F2119-07 [1] for a TSE (TR 500 ms,
TE 20 ms) and GRE (TR 100 ms,
TE 15 ms) sequence.
The evaluation was performed with the tool MR-Susceptibility Artefact Measurement (SAM) [2,
3] and histogram-based reference value (see Fig. 2).
Fig. 2: The maximum artifact size was measured with the software MR-Susceptibility Artifact Measurement (SAM) using histogram-based reference value. The graphical representation of all artifact sizes automatically measured in vertical (red) and horizontal (blue) orientation for a rectangular measurement field. See references [1-3] for more details.
References: Andreas Heinrich, Department of Radiology, University Hospital Jena - Jena/DE
The largest artifact sizes were compared with anatomy of four children in the age of 3 to 12 years.