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Metal and motion artifacts by cone beam computed tomography (CBCT) in dental and maxillofacial study

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Objectives

This study aimed at evaluating incidence/degree of metal/motion artifacts and CT-dose-index in oral/maxillofacial examinations using Cone-Beam-CT.

Methods

Interferences caused by metal and motion artifacts were evaluated in 500 patients aged from 6 to 81 years, in dental arches, maxillofacial and splanchocranium Cone-Beam-CT exams. The interferences was divided into four progressive degrees (G0–G3) related to the possibility to answer the clinical query. The parameters considered were field-of-view, scan time, patient’s age, and anatomical area. Furthermore volumetric CT-dose-index was measured.

Results

In the presence of metal artifacts the clinical query was always answered (G3 = 0). No artifacts (G0) were found in all cases when metal was beyond 5 cm from interest site and in 18.4 % when metal was inside this distance. Beam hardening and photon starvation due to implants, restoration and orthodontic therapies achieved 56.2 % G1 and 25.4 % G2. Motion artifacts were more frequent in under ten (31.5 %) and over sixty (82.2 %), and in mandible analysis (inferior arch 59.5 %, both arches 47.3 %). Moreover, their incidence and intensity were influenced by scan time (49.1 % at 36 s) but not by field-of-view. Mean volumetric CT-dose-index of all patients was mGy 9.11 (mGy 3.62, 5.78, 8.89, and 13.07 at 18, 24, 26, and 36 s, respectively).

Conclusions

In our series Cone-Beam-CT diagnostic evaluation was never inhibited by metal artifacts and only in 1.9 % of the cases by motion artifacts, always with a very low CT-dose-index.

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Abbreviations

MSCT:

Multislice spiral computed tomography

CBCT:

Cone beam computed tomography

AT:

Acquisition time

CTDI:

Computed tomography dose index

FOV:

Field of view

Z:

Atomic number

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Conflict of interest

The authors declare no conflict of interest.

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Authors and Affiliations

  1. Department of Experimental and Clinical Biomedical Sciences Radiodiagnostic Unit n. 2, University of Florence-Azienda Ospedaliero-Universitaria Careggi, Largo Brambilla 3, 50134, Florence, Italy

    Cosimo Nardi, Claudia Borri, Francesco Regini, Linda Calistri, Alessandro Castellani & Stefano Colagrande

  2. Department of Health Science, University of Florence, Viale Morgagni 48, 50134, Florence, Italy

    Chiara Lorini

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  1. Cosimo Nardi
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  2. Claudia Borri
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  4. Linda Calistri
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  7. Stefano Colagrande
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Correspondence to Stefano Colagrande.

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Nardi, C., Borri, C., Regini, F. et al. Metal and motion artifacts by cone beam computed tomography (CBCT) in dental and maxillofacial study. Radiol med 120, 618–626 (2015). https://doi.org/10.1007/s11547-015-0496-2

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  • DOI: https://doi.org/10.1007/s11547-015-0496-2

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