MRI vs. CT for orthodontic applications: comparison of two MRI protocols and three CT (multislice, cone-beam, industrial) technologies

Detterbeck, Andreas; Hofmeister, Michael; Hofmann, Elisabeth; Haddad, Daniel; Weber, Daniel L.; Hölzing, A.; Zabler, Simon; Schmid, Matthias; Hiller, K. H.; Jakob, Peter M.; Engel, Jens; Hiller, Jochen; Hirschfelder, Ursula

doi:10.1007/s00056-016-0028-2

Cited by 12 publications

(10 citation statements)

References 43 publications

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“…In contrast to CBCT, MRI is an imaging modality allowing radiation-free 3D imaging of the craniofacial region which could provide a wide range of new diagnostic options. In view of our results and former in vitro studies demonstrating high concordance between measurements on CBCT and MRI 20 , 21 , these two modalities might deliver equivalent results for 3D cephalometric analysis in vivo as well (within clinically acceptable margins).…”

Section: Discussionsupporting

confidence: 67%

“…Recently, however, considerable progress has been made in the application of MRI in craniofacial imaging through the development of high-field scanners, dedicated coil systems 12 , 13 and application-optimized sequences 14 , 15 . In particular, novel 3D sequences with high spatial resolution make MRI a promising modality for cephalometric analysis 16 , and in vitro studies have already been able to demonstrate that MRI allows for accurate osteometric measurements in the maxillofacial area 17 – 21 . Thus, MRI may resolve the dilemma between the limited diagnostic opportunities of conventional radiographs and the high radiation exposure of CBCT.…”

Section: Introductionmentioning

confidence: 99%

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3D cephalometric analysis using Magnetic Resonance Imaging: validation of accuracy and reproducibility

Juerchott

Saleem

Hilgenfeld

et al. 2018

Sci Rep

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The aim of this study was to validate geometric accuracy and in vivo reproducibility of landmark-based cephalometric measurements using high-resolution 3D Magnetic Resonance Imaging (MRI) at 3 Tesla. For accuracy validation, 96 angular and 96 linear measurements were taken on a phantom in 3 different positions. In vivo MRI scans were performed on 3 volunteers in five head positions. For each in vivo scan, 27 landmarks were determined from which 19 angles and 26 distances were calculated. Statistical analysis was performed using Bland-Altman analysis, the two one-sided tests procedure and repeated measures one-way analysis of variance. In comparison to ground truth, all MRI-based phantom measurements showed statistical equivalence (p < 0.001) and an excellent agreement in Bland-Altman analysis (bias ranges: −0.090–0.044°, −0.220–0.241 mm). In vivo cephalometric analysis was highly reproducible among the five different head positions in all study participants, without statistical differences for all angles and distances (p > 0.05). Ranges between maximum and minimum in vivo values were consistently smaller than 2° and 2 mm, respectively (average ranges: 0.88°/0.87 mm). In conclusion, this study demonstrates that accurate and reproducible 3D cephalometric analysis can be performed without exposure to ionizing radiation using MRI.

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Section: Discussionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

3D cephalometric analysis using Magnetic Resonance Imaging: validation of accuracy and reproducibility

Juerchott

Saleem

Hilgenfeld

et al. 2018

Sci Rep

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“…Whereas CT scores good to excellent results, differentiation of the junctions and intra-oral air content of the dental hard tissues was poor in MRI, which is in line with the results in human medicine [19]. Unsatisfactory scores of bony and dental hard tissue structures are caused by the inability of conventional MR measuring methods to compensate for the very short relaxation times in hard tissues [33]. The MRI only provides an indirect depiction of structures with low proton densities: good visibility of the hypointense maxillary cortical bone and the infra-orbital canal were only possible because of their delineation against the hyperintense mucosa of the sinuses, and visibility of the extra-alveolar part of the dental hard tissues through the delineation against hyper- and isointense tongue tissue and saliva.…”

Section: Discussionmentioning

confidence: 54%

Magnetic resonance imaging and computed tomography of equine cheek teeth and adjacent structures: comparative study of image quality in horses in vivo, post-mortem and frozen-thawed

et al. 2019

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BackgroundThe use of cadavers for radiology research methodologies involving subjective image quality evaluation of anatomical criteria is well-documented. The purpose of this method comparison study was to evaluate the image quality of dental and adjacent structures in computed tomography (CT) and high-field (3 T) magnetic resonance (MR) images in cadaveric heads, based on an objective four-point rating scale. Whilst CT is a well-established technique, MR imaging (MRI) is rarely used for equine dental diagnostics. The use of a grading system in this study allowed an objective assessment of CT and MRI advantages in portraying equine cheek teeth. As imaging is commonly performed with cadaveric or frozen and thawed heads for dental research investigations, the second objective was to quantify the impact of the specimens’ conditions (in vivo, post-mortem, frozen-thawed) on the image quality in CT and MRI.ResultsThe CT and MR images of nine horses, focused on the maxillary premolar 08s and molar 09s, were acquired post-mortem (Group A). Three observers scored the dental and adjacent tissues. Results showed that MR sequences gave an excellent depiction of endo- and periodontal structures, whereas CT produced high-quality images of the hard tooth and bony tissues. Additional CT and MRI was performed in vivo (Group B) and frozen-thawed (Group C) in three of these nine horses to specify the condition of the best specimens for further research. Assessing the impact of the specimens’ conditions on image quality, specific soft tissues of the maxillary 08s and 09s including adjacent structures (pulps, mucosa of the maxillary sinuses, periodontal ligament, soft tissue inside the infraorbital canal) were graded in group B and C and analysed for significant differences within CT and MR modalities in comparison to group A. Results showed that MRI scores in vivo were superior to the post-mortem and frozen-thawed condition.ConclusionsOn comparing the imaging performance of CT and MRI, both techniques show a huge potential for application in equine dentistry. Further studies are needed to assess the clinical suitability of MRI. For further research investigations it must be considered, that the best MR image quality is provided in live horses.

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“…As with DVT, a special X-ray template is usually used during imaging which is necessary for later implant planning. CT provides advantages over DVT with respect to soft tissue contrast; an MRI examination may also be used for this, if needed [21]. To date dental MRI has been used for experimental approaches [22].…”

Section: Imaging Techniquesmentioning

confidence: 99%

Dental Imaging – A basic guide for the radiologist

Masthoff

Gerwing

Masthoff

et al. 2018

Fortschr Röntgenstr

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/2 51/8 35 62 79 max.masthoff@ukmuenster.de ABSTR AC T Background As dental imaging accounts for approximately 40 % of all X-ray examinations in Germany, profound knowledge of this topic is essential not only for the dentist but also for the clinical radiologist. This review focuses on basic imaging findings regarding the teeth. Therefore, tooth structure, currently available imaging techniques and common findings in conserving dentistry including endodontology, periodontology, implantology and dental trauma are presented.Methods Literature research on the current state of dental radiology was performed using Pubmed.Results and Conclusion Currently, the most frequent imaging techniques are the orthopantomogram (OPG) and single-tooth radiograph, as well as computer tomography (CT) and cone beam CT mainly for implantology (planning or postoperative control) or trauma indications.

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MRI vs. CT for orthodontic applications: comparison of two MRI protocols and three CT (multislice, cone-beam, industrial) technologies

Cited by 12 publications

References 43 publications

3D cephalometric analysis using Magnetic Resonance Imaging: validation of accuracy and reproducibility

3D cephalometric analysis using Magnetic Resonance Imaging: validation of accuracy and reproducibility

Magnetic resonance imaging and computed tomography of equine cheek teeth and adjacent structures: comparative study of image quality in horses in vivo, post-mortem and frozen-thawed

Dental Imaging – A basic guide for the radiologist

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