Cone-Beam Computed Tomography and Radiographs in Dentistry: Aspects Related to Radiation Dose

Lorenzoni, Diego Coelho; Bolognese, Ana Maria; Garib, Daniela Gamba; Guedes, Fábio Pinto; Sant’Anna, Eduardo Franzotti

doi:10.1155/2012/813768

Cited by 98 publications

(68 citation statements)

References 39 publications

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“…The effect of different CBCT collimations at the same geometry of image acquisition on the effective dose and organs in the head and the neck regions has been shown to be considerable. 39 However, the effect of collimation far from the primary beam (at foetal and breast positions) may not be as large as it is for all organs in the head and the neck regions.…”

Section: Discussionmentioning

confidence: 99%

Radiation exposure to foetus and breasts from dental X-ray examinations: effect of lead shields

Kelaranta

Ekholm

Toroi

et al. 2016

Dentomaxillofacial Radiology

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Objectives: Dental radiography may involve situations where the patient is known to be pregnant or the pregnancy is noticed after the X-ray procedure. In such cases, the radiation dose to the foetus, though low, needs to be estimated. Uniform and widely used guidance on dental X-ray procedures during pregnancy are presently lacking, the usefulness of lead shields is unclear and practices vary. Methods: Upper estimates of radiation doses to the foetus and breasts of the pregnant patient were estimated with an anthropomorphic female phantom in intraoral, panoramic, cephalometric and CBCT dental modalities with and without lead shields. Results: The upper estimates of foetal doses varied from 0.009 to 6.9 mGy, and doses at the breast level varied from 0.602 to 75.4 mGy. With lead shields, the foetal doses varied from 0.005 to 2.1 mGy, and breast doses varied from 0.002 to 10.4 mGy. Conclusions: The foetal dose levels without lead shielding were ,1% of the annual dose limit of 1 mSv for a member of the public. Albeit the relative shielding effect, the exposure-induced increase in the risk of breast cancer death for the pregnant patient (based on the breast dose only) and the exposure-induced increase in the risk of childhood cancer death for the unborn child are minimal, and therefore, need for foetal and breast lead shielding was considered irrelevant. Most important is that pregnancy is never a reason to avoid or to postpone a clinically justified dental radiographic examination.

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Section: Discussionmentioning

confidence: 99%

Radiation exposure to foetus and breasts from dental X-ray examinations: effect of lead shields

Kelaranta

Ekholm

Toroi

et al. 2016

Dentomaxillofacial Radiology

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“…The use of the panoramic scout for cone-beam CT was marginally higher in dose than its 2D counterpart. (15), (16).…”

Section: Discussionmentioning

confidence: 99%

Assessment of Radiation Exposure of Head and Neck during Panoramic Radiography in Different Age Groups

Moudi¹

2014

SJCM

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Background and aim: Panoramic imaging is one of the most commonly used imaging techniques in dentistry.Being able to accurately assess the radiation dose patients receive during procedures is a crucial step in the management of dose. The main objective of this study was to evaluate the head and neck skin absorbed dose during panoramic radiography in different age groups with panoramic machine of Oral and Maxillofacial Radiology section of Babol school of dentistry. Materials and methods: 273 thermoluminescent dosemeters (TLDs) (100 LiF: Mg, Ti , harshaw, USA) were used.90 samples were selected from the patients who referred to the Oral and Maxillofacial Radiology section of Babol school of dentistry for panoramic radiography. .Samples divided in 3 age_ group: 4_ 10 years, 10_40 years and above 40 years . TLDs were calibrated in dosimetry laboratory, National Radiation Protection Department. Thermoluminescent signal was read out with a Harshaw 4500 (Harshaw, Bicron USA) reader. Mean and standard deviation was determined by SPSS10 software and ANOVA statistic analysis. Results: Mean ± SD of skin absorbed dose of head and neck for 90 patients was 0.47± 0.09mGy. Conclusions: Since Diagnostic Reference level (DRL) of panoramic imaging is unknown in Iran, there is no possibility to compare the current results with DRL. However, This study conclude that decrease of radiation dose seems to be achievable with lower exposure condition with the panoramic unit.

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“…The dose levels range between 20 and 400 mSv for CBCT and around 1000 mSv for multidetector row CT modalities, which is about 10-50 times more than a conventional panoramic radiograph (about 20 mSv). 13,14 Even though device manufacturers have been developing "ultra" low-dose CT scanning protocols, [15][16][17] any X-ray-based imaging technology inevitably results in some radiation exposure. Therefore, an alternative, radiation-free imaging modality is still being sought, especially in applications that require a large number of follow-up scans.…”

Section: Introductionmentioning

confidence: 99%

The accuracy of ultrashort echo time MRI sequences for medical additive manufacturing

Eijnatten¹,

Rijkhorst²,

Hofman³

et al. 2016

Dentomaxillofacial Radiology

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Objectives: Additively manufactured bone models, implants and drill guides are becoming increasingly popular amongst maxillofacial surgeons and dentists. To date, such constructs are commonly manufactured using CT technology that induces ionizing radiation. Recently, ultrashort echo time (UTE) MRI sequences have been developed that allow radiation-free imaging of facial bones. The aim of the present study was to assess the feasibility of UTE MRI sequences for medical additive manufacturing (AM). Methods: Three morphologically different dry human mandibles were scanned using a CT and MRI scanner. Additionally, optical scans of all three mandibles were made to acquire a "gold standard". All CT and MRI scans were converted into Standard Tessellation Language (STL) models and geometrically compared with the gold standard. To quantify the accuracy of the AM process, the CT, MRI and gold-standard STL models of one of the mandibles were additively manufactured, optically scanned and compared with the original gold-standard STL model. Results: Geometric differences between all three CT-derived STL models and the gold standard were ,1.0 mm. All three MRI-derived STL models generally presented deviations ,1.5 mm in the symphyseal and mandibular area. The AM process introduced minor deviations of ,0.5 mm. Conclusions: This study demonstrates that MRI using UTE sequences is a feasible alternative to CT in generating STL models of the mandible and would therefore be suitable for surgical planning and AM. Further in vivo studies are necessary to assess the usability of UTE MRI sequences in clinical settings.

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Cone-Beam Computed Tomography and Radiographs in Dentistry: Aspects Related to Radiation Dose

Cited by 98 publications

References 39 publications

Radiation exposure to foetus and breasts from dental X-ray examinations: effect of lead shields

Radiation exposure to foetus and breasts from dental X-ray examinations: effect of lead shields

Assessment of Radiation Exposure of Head and Neck during Panoramic Radiography in Different Age Groups

The accuracy of ultrashort echo time MRI sequences for medical additive manufacturing

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