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Proceedings Paper

Quantitative evaluation of susceptibility effects caused by dental materials in head magnetic resonance imaging
Author(s): S. Strocchi; M. Ghielmi; F. Basilico; A. Macchi; R. Novario; R. Ferretti; E. Binaghi
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Paper Abstract

This work quantitatively evaluates the effects induced by susceptibility characteristics of materials commonly used in dental practice on the quality of head MR images in a clinical 1.5T device. The proposed evaluation procedure measures the image artifacts induced by susceptibility in MR images by providing an index consistent with the global degradation as perceived by the experts. Susceptibility artifacts were evaluated in a near-clinical setup, using a phantom with susceptibility and geometric characteristics similar to that of a human head. We tested different dentist materials, called PAL Keramit, Ti6Al4V-ELI, Keramit NP, ILOR F, Zirconia and used different clinical MR acquisition sequences, such as “classical” SE and fast, gradient, and diffusion sequences. The evaluation is designed as a matching process between reference and artifacts affected images recording the same scene. The extent of the degradation induced by susceptibility is then measured in terms of similarity with the corresponding reference image. The matching process involves a multimodal registration task and the use an adequate similarity index psychophysically validated, based on correlation coefficient. The proposed analyses are integrated within a computer-supported procedure that interactively guides the users in the different phases of the evaluation method. 2-Dimensional and 3-dimensional indexes are used for each material and each acquisition sequence. From these, we drew a ranking of the materials, averaging the results obtained. Zirconia and ILOR F appear to be the best choice from the susceptibility artefacts point of view, followed, in order, by PAL Keramit, Ti6Al4V-ELI and Keramit NP.

Paper Details

Date Published: 22 March 2016
PDF: 13 pages
Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 978357 (22 March 2016); doi: 10.1117/12.2206083
Show Author Affiliations
S. Strocchi, Varese Hospital (Italy)
M. Ghielmi, Univ. degli Studi dell'Insubria (Italy)
F. Basilico, Univ. degli Studi dell'Insubria (Italy)
A. Macchi, Univ. degli Studi dell'Insubria (Italy)
R. Novario, Univ. Hospital of Varese (Italy)
R. Ferretti, Genoa Univ. (Italy)
E. Binaghi, Univ. Hospital of Varese (Italy)


Published in SPIE Proceedings Vol. 9783:
Medical Imaging 2016: Physics of Medical Imaging
Despina Kontos; Thomas G. Flohr, Editor(s)

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