Evaluation of the effective dose of cone beam CT and multislice CT for temporomandibular joint examinations at optimized exposure levels

Kadesjö, Nils; Benchimol, Daniel; Falahat, Babak; Näsström, Karin; Shi, X-Q

doi:10.1259/dmfr.20150041

Cited by 35 publications

(20 citation statements)

References 19 publications

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“…In the tomographic axial plane rotational condylar movements are observed after surgery despite of condylar transoperative repositioning, most condylar position studies have omitted this measurement and have measured the condyle bi-dimensionally only. Also in the axial tomographic plane lateromedial condylar movements and "sag" can be observed, but have been negligible during postoperative clinical examination [8,16].…”

Section: Discussionmentioning

confidence: 99%

Correlation between mandibular condylar position and clinical dysfunction index after bilateral sagittal split osteotomies

J¹,

González-Magaña²,

O³

2019

J Oral Health Craniofac Sci

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Several articles have discussed mandibular condyle position after bilateral sagittal split osteotomies (BSSO). However, previous studies have sought to establish a relationship between orthognathic surgery and the improvement of temporomandibular joint (TMJ) signs and symptoms. Also, they have been limited to two-dimensional evaluation of condylar position considering only the condylar "sag" or improper inferior seating of the condyle. The purpose of this study was to investigate a relationship between changes in condylar position using three-dimensional computed tomography and the negative clinical impact of BSSO on the temporomandibular joint.How to cite this article: Kalach Mussali AJ, Gonzalez-Magana F, Malagon Hidalgo HO. Correlation between mandibular condylar position and clinical dysfunction index after bilateral sagittal split osteotomies. J

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Section: Discussionmentioning

confidence: 99%

Correlation between mandibular condylar position and clinical dysfunction index after bilateral sagittal split osteotomies

J¹,

González-Magaña²,

O³

2019

J Oral Health Craniofac Sci

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“…Some exhibit significantly lower patient doses than conventional CT. 10,18,19 This might be a result of optimization of CT protocols in the last few years as one study found that dependent on the model, radiation in multislice CT could be reduced after protocol optimization below radiation dose in cone-beam CT. 20 Another study found that cone-beam CT yielded significantly higher effective doses than CT but it could be reduced to equal and lower than CT after optimization. 21 The scan time varies between 20 and 24 s. This is likely to influence image quality in clinical application, especially for imaging close to the trunk, where breathing and heart movement will cause movement artifacts. Particularly, imaging in the upright position in elderly and patients with pain will be prone to movement artifacts.…”

Section: Discussionmentioning

confidence: 99%

Initial evaluation of image performance of a 3-D x-ray system: phantom-based comparison of 3-D tomography with conventional computed tomography

et al. 2018

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Phantom-based initial performance assessment of a prototype three-dimensional (3-D) x-ray system and comparison of 3-D tomography with computed tomography (CT) were proposed. A 3-D image quality phantom was scanned with a prototype version of 3-D cone-beam CT imaging implemented on a twin robotic x-ray system using three trajectories (163 deg = table, 188 deg = upright, and 200 deg = side), six tube voltages (60, 70, 81, 90, 100, and 121 kV), and four detector doses (0.348, 0.696, 1.740, and [Formula: see text]). CT was obtained with a clinical protocol. Spatial resolution (line pairs/cm) and soft-tissue-contrast resolution were assessed by two independent readers. Radiation dose was assessed. Descriptive and analysis of variance (ANOVA) ([Formula: see text]) were performed. With 3-D tomography, a maximum of 16 lp/cm was visible and best soft-tissue-contrast resolution was 2 mm at 30 Hounsfield units (HU) for 160 projections. With CT, 10 lp/cm was visible and soft-tissue-contrast resolution was 4 mm at 20 HU. The upright trajectory yielded significantly better spatial resolution and soft tissue contrast, and the side trajectory yielded significantly higher soft tissue contrast than the table trajectory ([Formula: see text]). Radiation dose was higher in 3-D tomography (45 to 704 mGycm) than CT (44 mGycm). Three-dimensional tomography renders overall equal or higher spatial resolution and comparable soft tissue contrast to CT for medium- and high-dose protocols in the side and upright trajectories, but with higher radiation doses.

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“…Often, its diagnostic accuracy and reliability are better than that of two‐dimensional (2D) images 1 . CBCT provides comparable diagnostic accuracy with a relatively lower radiation dose and cost compared with medical computed tomography (CT) 2‐4 and, at present, is considered the technique of choice for evaluating osseous changes of the TMJ 5 …”

Section: Introductionmentioning

confidence: 99%

Web‐based educational programme for temporomandibular joint assessment with cone‐beam computed tomography

Iskanderani

Alstergren

Ekberg

et al. 2020

J of Oral Rehabilitation

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Objectives To develop and evaluate an educational web‐based programme for temporomandibular joint (TMJ) assessment using cone‐beam computed tomography (CBCT). Methods A web‐based educational programme was designed for TMJ assessment using CBCT images. Fifteen CBCT cases of the TMJ (three‐dimensional reconstructed volumes) and an assessment module based on image analysis criteria in the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD) were added to the programme. Thirty‐six undergraduate dental students were invited to test the programme by assessing all cases twice: before and after 2 months of training. Participants submitted written subjective evaluations of the programme. Results The web‐based programme can be accessed on Malmö University webpage (http://www.cbct-tmj.mau.se). Despite limited CBCT learning in their undergraduate training and not using the programme in the 2‐month interval, the students were able to correctly diagnose 80% of the cases at the second assessment. Their diagnoses, however, did not differ significantly from the first assessment. Overall, the students were satisfied with the programme and considered it user‐friendly. Conclusion The web‐based educational programme that was developed in the present study and tested by dental students could be a useful educational tool for TMJ assessment using CBCT.

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Evaluation of the effective dose of cone beam CT and multislice CT for temporomandibular joint examinations at optimized exposure levels

Cited by 35 publications

References 19 publications

Correlation between mandibular condylar position and clinical dysfunction index after bilateral sagittal split osteotomies

Correlation between mandibular condylar position and clinical dysfunction index after bilateral sagittal split osteotomies

Initial evaluation of image performance of a 3-D x-ray system: phantom-based comparison of 3-D tomography with conventional computed tomography

Web‐based educational programme for temporomandibular joint assessment with cone‐beam computed tomography

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