Detail publikace

Evaluation of MRI artifacts caused by metallic dental implants and classification of the dental materials in use

Originální název

Evaluation of MRI artifacts caused by metallic dental implants and classification of the dental materials in use

Anglický název

Evaluation of MRI artifacts caused by metallic dental implants and classification of the dental materials in use

Jazyk

en

Originální abstrakt

Metallic objects (dental fillings, crowns, fixed bridges etc.), now found in many patients, may become a reason for the patients ineligibility for MR examination because of safety or image artifact concerns. The severity of the MRI artifacts caused by these objects depends primarily on the material, shape, position and orientation of the object, MRI method applied, and the location of the tissues of interest. The purpose of this work is to demonstrate the artifacts and describe a method of measuring the relevant material properties and the results. A method for the measurement of magnetic susceptibility based on field distortion simulation and field mapping based on MRI is described. Objects made of several materials were tested experimentally and these results were checked against simulated results. It has been found that among the more than 100 dental materials currently in use there are highly paramagnetic materials (Ni-Cr or Co-Cr based alloys), in which B0 inhomogeneity effects dominate, as well as slightly diamagnetic materials (alloys of precious metals and amalgams), which may cause artifacts due to the RF field inhomogeneity arising from induced RF currents. Spatial mapping of these effects may give indication of potential hot spots in these objects.

Anglický abstrakt

Metallic objects (dental fillings, crowns, fixed bridges etc.), now found in many patients, may become a reason for the patients ineligibility for MR examination because of safety or image artifact concerns. The severity of the MRI artifacts caused by these objects depends primarily on the material, shape, position and orientation of the object, MRI method applied, and the location of the tissues of interest. The purpose of this work is to demonstrate the artifacts and describe a method of measuring the relevant material properties and the results. A method for the measurement of magnetic susceptibility based on field distortion simulation and field mapping based on MRI is described. Objects made of several materials were tested experimentally and these results were checked against simulated results. It has been found that among the more than 100 dental materials currently in use there are highly paramagnetic materials (Ni-Cr or Co-Cr based alloys), in which B0 inhomogeneity effects dominate, as well as slightly diamagnetic materials (alloys of precious metals and amalgams), which may cause artifacts due to the RF field inhomogeneity arising from induced RF currents. Spatial mapping of these effects may give indication of potential hot spots in these objects.

BibTex


@article{BUT46143,
  author="Zenon {Starčuk} and Karel {Bartušek} and Hana {Hubálková} and Tibor {Bachorec} and Jana {Starčuková} and Petr {Krupa}",
  title="Evaluation of MRI artifacts caused by metallic dental implants and classification of the dental materials in use",
  annote="Metallic objects (dental fillings, crowns, fixed bridges etc.), now found in many patients, may become a reason for the patients ineligibility for MR examination because of safety or image artifact concerns. The severity of the MRI artifacts caused by these objects depends primarily on the material, shape, position and orientation of the object, MRI method applied, and the location of the tissues of interest. The purpose of this work is to demonstrate the artifacts and describe a method of measuring the relevant material properties and the results. A method for the measurement of magnetic susceptibility based on field distortion simulation and field mapping based on MRI is described. Objects made of several materials were tested experimentally and these results were checked against simulated results. It has been found that among the more than 100 dental materials currently in use there are highly paramagnetic materials (Ni-Cr or Co-Cr based alloys), in which B0 inhomogeneity effects dominate, as well as slightly diamagnetic materials (alloys of precious metals and amalgams), which may cause artifacts due to the RF field inhomogeneity arising from induced RF currents. Spatial mapping of these effects may give indication of potential hot spots in these objects.",
  chapter="46143",
  journal="Measurement Science Review",
  number="2",
  volume="6",
  year="2006",
  month="february",
  pages="24",
  type="journal article - other"
}