Effectiveness of thyroid gland shielding in dental CBCT using a paediatric anthropomorphic phantom

Hidalgo, Alejandro; Davies, Jonathan S.; Horner, Keith; Theodorakou, Chrysoula

doi:10.1259/dmfr.20140285

Cited by 36 publications

(16 citation statements)

References 24 publications

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“…In a child phantom study focusing on optimization of CBCT scans of impacted maxillary canines with a small (4 × 4 cm) FOV, reduction of tube voltage and current from the recommendations of the manufacturer resulted in a 50% dose reduction, an acceptable image quality retained [23]. Reduction of FOV size has proven even more significant in the reduction of effective dose in children than in adults [13,20], and the use of thyroid shield is recommended [24,25]. While it has also been recommended to reduce the beam height when imaging impacted canines, a suggested FOV size has not been specified [18].…”

Section: Discussionmentioning

confidence: 99%

Minimum size and positioning of imaging field for CBCT scans of impacted maxillary canines

et al. 2019

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Objectives In children and adolescents, cone-beam computed tomography (CBCT) is frequently used for localization of unerupted or impacted teeth in the anterior maxilla. CBCT causes a higher radiation dose than conventional intraoral and panoramic imaging. The objective was to analyze the location of impacted canines in a three-dimensional coordinate and thereby optimize the CBCT field-of-view (FOV), for radiation dose reduction. Materials and methods Location of 50 impacted maxillary canines of children under 17 years was retrospectively evaluated from CBCT scans. The minimum and maximum distances of any part of the right-and left-side canines to three anatomic reference planes were measured to assess the adequate size and position of a cylindrical image volume. Results A cylinder sized 39.0 (diameter) × 33.2 (height) mm, with its top situated 13.8 mm above the hard palate, its medial edge 8.4 mm across the midline, and anterior edge 2.5 mm in front of the labial surface of maxillary central incisors fitted all the analyzed canines. Conclusions In this sample, the FOV required for imaging maxillary impacted canines was smaller than the smallest FOV offered by common CBCT devices. We encourage development of indication-specific CBCT imaging programs and aids to facilitate optimum patient positioning. Clinical relevance An impacted maxillary canine is a common dental problem and a frequent indication for 3D imaging particularly in growing individuals. This article focuses on the optimization of CBCT of impacted canines. Our recommendation of a reduced FOV promotes radiation safety.

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Section: Discussionmentioning

confidence: 99%

Minimum size and positioning of imaging field for CBCT scans of impacted maxillary canines

et al. 2019

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“…Recent studies have shown that using thyroid shielding for a large FOV exposure of children could contribute to thyroid gland dose reduction.…”

Section: Discussionmentioning

confidence: 99%

Estimation of the radiation dose for pediatric CBCT indications: a prospective study on ProMax3D

Marcu

Hedeșiu

Salmon

et al. 2018

Int J Paed Dentistry

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“…On the other hand, a retrospective survey of previous CT or MR images of children taken from the area of neck can be beneficial to locate the thyroid gland level. In a report by Hidalgo et al, 27 the location of the thyroid gland in 10-year-old patients was estimated based on the analysis of a limited number of CT and MRI examinations. Benefiting retrospective three-dimensional radiographic examinations of children in different age groups is a safe way to localize the thyroid gland in respect to the cervical vertebrae in order to optimize the use of the TS in lateral cephalometric radiography.…”

Section: Discussionmentioning

confidence: 99%

Ultrasonographic localization of the thyroid gland for its optimal shielding prior to lateral cephalometric radiography: a pilot study

Esmaeili¹,

Hurmerinta²,

Rice

et al. 2016

Dentomaxillofacial Radiology

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Objectives: Lateral cephalometric radiography is a common radiographic examination technique in children. The exclusion of the thyroid gland from the primary X-ray beam is important especially with children. However, patient treatment might require displaying the four most cranial cervical vertebrae (C1-C4) for the assessment of cervical vertebral maturation. Our aim was to present a safe way to display C1-C4 and exclude the thyroid gland from the X-ray beam during lateral cephalometric radiography. Methods: The thyroid glands of 25, 7-to 12-year-old patients were localized by ultrasound examination and shielded prior to lateral cephalometric radiography. A roentgen-positive mark was taped on the patient's skin at the level of most cranial level of the thyroid gland in the midsagittal plane. After exposure, each lateral cephalometric radiograph (LCR) was analyzed for the visibility of the cervical vertebrae. The distance between the ear post and the highest edge of the thyroid shield (TS) at the lateral part of the neck was measured and compared with the distance between the centre of the radiological external auditory meatus, and a roentgen-positive mark was made on the LCR. Results: 68% of the LCRs displayed C1-C4, and the rest of them displayed C1-C3. In all of the patients, the highest edge of the TS in the lateral parts of the neck was located in a higher position than the actual most cranial level of the thyroid gland. Conclusions: Despite localizing the thyroid gland prior to lateral cephalometric radiography, simultaneous visualization of C1-C4 and exclusion of the thyroid gland from the primary Xray beam during lateral cephalometric radiography might not be completely possible in children because of the design and poor fitness of the TS.

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Effectiveness of thyroid gland shielding in dental CBCT using a paediatric anthropomorphic phantom

Cited by 36 publications

References 24 publications

Minimum size and positioning of imaging field for CBCT scans of impacted maxillary canines

Minimum size and positioning of imaging field for CBCT scans of impacted maxillary canines

Estimation of the radiation dose for pediatric CBCT indications: a prospective study on ProMax3D

Ultrasonographic localization of the thyroid gland for its optimal shielding prior to lateral cephalometric radiography: a pilot study

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