Effect of interference of metallic objects on interpretation of T1-weighted magnetic resonance images in the maxillofacial region

Abbaszadeh, Keyvan; Heffez, Leslie B.; Mafee, Mahmood F.

doi:10.1067/moe.2000.105942

Cited by 67 publications

(43 citation statements)

References 6 publications

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“…In our study, the size of amalgam artifacts was small, which was in line with the findings of previous studies in this respect (6,14,15). However, somewhat contradictory findings have been published concerning the intensity of image artifacts produced by different dental materials (7,10,(14)(15)(16).…”

Section: Discussionsupporting

confidence: 81%

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Quantification of Artifacts in MR Images Caused by Commonly Used Dental Materials

et al. 2017

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Background: Although new approaches for application of magnetic resonance imaging (MRI) in dentistry have been promising, the presence of dental materials in the oral cavity represents a major obstacle to generating quality MRI data. The resulting artifacts can adversely affect diagnostic accuracy of oral and maxillofacial conditions. Objectives: This study aimed to detect and assess artifacts caused by metallic and non-metallic dental materials in MR images. Materials and Methods: Nineteen commonly used dental materials were used in an in vitro assay. An empty cube-shaped phantom

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Section: Discussionsupporting

confidence: 81%

“…However, somewhat contradictory findings have been published concerning the intensity of image artifacts produced by different dental materials (7,10,(14)(15)(16). For instance, inconsistent findings have been stated for amalgam, titanium, and other dental materials (6).…”

Section: Discussionmentioning

confidence: 93%

Quantification of Artifacts in MR Images Caused by Commonly Used Dental Materials

et al. 2017

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“…[8][9][10][11][12][13][14][15][16][17] For example, in some studies, high gold-content alloys were reported not to show any disturbance in phantoms 11,13 and porcine jaw ex vivo 12 but produced significant artefacts in other studies. 8,9 Similar contradictory results have been reported for titanium, dental amalgam and other materials. The strength of artefacts depends on many factors including magnetic field strength, pulse sequence, echo time, image resolution and the related gradient field strength, imaging plane, amount and shape of the dental material and distance between the object of interest and the material.…”

Section: Introductionmentioning

confidence: 99%

Influence of dental materials on dental MRI

Tymofiyeva¹,

Vaegler²,

Rottner³

et al. 2013

Dentomaxillofacial Radiology

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Objectives: To investigate the potential influence of standard dental materials on dental MRI (dMRI) by estimating the magnetic susceptibility with the help of the MRI-based geometric distortion method and to classify the materials from the standpoint of dMRI. Methods: A series of standard dental materials was studied on a 1.5 T MRI system using spin echo and gradient echo pulse sequences and their magnetic susceptibility was estimated using the geometric method. Measurements on samples of dental materials were supported by in vivo examples obtained in dedicated dMRI procedures. Results: The tested materials showed a range of distortion degrees. The following materials were classified as fully compatible materials that can be present even in the tooth of interest: the resinbased sealer AH Plus ® (Dentsply, Maillefer, Germany), glass ionomer cement, gutta-percha, zirconium dioxide and composites from one of the tested manufacturers. Interestingly, composites provided by the other manufacturer caused relatively strong distortions and were therefore classified as compatible I, along with amalgam, gold alloy, gold-ceramic crowns, titanium alloy and NiTi orthodontic wires. Materials, the magnetic susceptibility of which differed from that of water by more than 200 ppm, were classified as non-compatible materials that should not be present in the patient's mouth for any dMRI applications. They included stainless steel orthodontic appliances and CoCr. Conclusions: A classification of the materials that complies with the standard grouping of materials according to their magnetic susceptibility was proposed and adopted for the purposes of dMRI. The proposed classification can serve as a guideline in future dMRI research.

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“…1 Tıpta ve diş hekimliğinde, birçok hastalığın [migren, multipl skleroz, baş-boyun tümörleri, epilepsi, temporomandibüler eklem (TME) rahatsızlıkları vb.] teşhisinde yaygın olarak kullanılmaktadır.…”

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Should Brackets be Removed Before Magnetic Resonance Imaging?

Camcı¹

2018

Turkiye Klinikleri J Dental Sci

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Ö ÖZ ZE ET T Manyetik rezonans görüntüleme sistemi (MRG), 20 yılı aşkın süredir tıpta ve diş hekimliğinde kullanılan, iyonize radyasyon içermeyen, noninvaziv bir görüntüleme sistemidir. MRG yumuşak doku kontrastı en yüksek görüntüleme sistemidir ve migren, epilepsi, serebral palsi, menisküs, beyin tümörleri gibi birçok hastalığın teşhisinde yaygın olarak kullanılmaktadır. Ancak; MRG çekiminde, metal varlığı görüntüde artefakta yol açmaktadır. Artefakt ise teşhisi zorlaştır-makta veya imkansızlaştırmaktadır. Artefaktın boyutu; metalin manyetik duyarlılığına (ferromanyetik, diyamanyetik, paramanyetik), şekline, boyutuna, açısına, homojenitesine, MRG cihazının manyetik alan gücüne (low-field, high-field, ultra-high field) ve görüntüleme protokolüne göre değişkenlik göstermektedir. Son yıllarda özellikle baş-boyun bölgesinden alınacak MRG öncesi sık-lıkla ortodontistlerden sabit ortodontik aygıtları çıkarması istenir; ancak "debonding" işlemi, mineye zarar verme potansiyelinin dışında vakit kaybına yol açan maliyetli bir süreçtir. Ortodontide kullanılan malzemeler çok çeşitli alaşımlardan (paslanmaz çelik, titanyum, krom-kobalt, seramik) yapılmaktadır ve her birinin manyetik duyarlılığı ve artefakta yol açma potansiyeli birbirinden farklıdır. Ayrıca; sabit ortodontik aygıtlar MRG' de görüntülenmek istenen anatomik alanın uzaklığına bağlı olarak ilgili bölgede değişen oranlarda artefakta yol açabilir ya da açmayabilir. Bu ça-lışmada; MRG nedir?, MRG'nin avantajları ve dezavantajları, manyetik alan kuvvetinin ortodontide kullanılan materyaller üzerine etkileri, Ortodontik aygıtların MRG üzerine etkileri gibi konu baş-lıkları altında MRG öncesi braketlerin çıkarılıp çıkarılmamasına karar vermede ortodontistlere yardımcı olacak bilgilerin sunulması amaçlanmıştır.A An na ah ht ta ar r K Ke el li im me el le er r: : Manyetik rezonans görüntüleme; artefaktlar (insan eliyle yapılmış); ortodontik gereçler; ortodontik braketler A AB BS ST TR RA AC CT T Magnetic resonance imaging system (MRI) is used in medicine and dentistry for more than 20 years, it does not include ionizing radiation which is a noninvasive imaging system. MRI enables highest contrast visualization of soft tissue and is widely used in the diagnosis of many diseases such as migraine, epilepsy, cerebral palsy, meniscus, brain tumors. But; the presence of metal in MRI leads to artifacts and artifact makes diagnosis difficult or impossible. The size of the artifact depends on the magnetic susceptibility of the metal (ferromagnetic, diamagnetic, paramagnetic), shape, size, angle, homogeneity, magnetic field power (low-field, highfield and ultra-high field) and imaging protocol of the MRI device. In recent years, it is often asked to remove fixed orthodontic devices from orthodontists, especially before the MRI taken from the head and neck region; but the debonding procedures is a costly process that leads to a loss of time other than the potential for damaging the enamel. Materials used in orthodontics are made from a wide variety of alloys (stainless steel, tit...

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Effect of interference of metallic objects on interpretation of T1-weighted magnetic resonance images in the maxillofacial region

Cited by 67 publications

References 6 publications

Quantification of Artifacts in MR Images Caused by Commonly Used Dental Materials

Quantification of Artifacts in MR Images Caused by Commonly Used Dental Materials

Influence of dental materials on dental MRI

Should Brackets be Removed Before Magnetic Resonance Imaging?

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