scholarly journals Dose optimization by altering the operating potential and tube current exposure time product in dental cone beam CT: a systematic review

2016 ◽  
Vol 45 (3) ◽  
pp. 20150254 ◽  
Author(s):  
Rebekah Goulston ◽  
Jonathan Davies ◽  
Keith Horner ◽  
Frederick Murphy
Keyword(s):  
Systematic Review ◽  
Exposure Time ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Dose Optimization ◽  
Tube Current ◽  
Operating Potential ◽  
Current Exposure

scholarly journals Thyroid shielding in cone beam computed tomography: recommendations towards appropriate use

2019 ◽  
Vol 48 (7) ◽  
pp. 20190014 ◽  
Author(s):  
Ruben Pauwels ◽  
Keith Horner ◽  
Jenia Vassileva ◽  
Madan M. Rehani
Keyword(s):  
Cone Beam Ct ◽  
Cone Beam ◽  
Current Evidence ◽  
Appropriate Use ◽  
Risk Models ◽  
Equivalent Thickness ◽  
Metal Artefacts ◽  
Current Trends ◽  
Dosimetric Data ◽  
Tube Current

The objective of this paper is to provide recommendations towards the appropriate use of thyroid shielding in dental cone beam CT (CBCT). Based on current evidence of thyroid radiosensitivity, dosimetric data in the presence and absence of shielding, and a depiction of potential adverse effects of thyroid shielding, a concise set of recommendations was prepared. According to current risk models, thyroid sensitivity is particularly high at a young age, and much higher for females. In the literature, involving adult male, female and paediatric reference phantoms, the use of a tightly fitted thyroid collar with a lead-equivalent thickness of at least 0.25 mm has consistently shown a significant reduction (average: 45.9%) of the equivalent dose to the thyroid. It can therefore be recommended that thyroid shielding should be routinely used for children undergoing CBCT scanning and is recommended for adults up to the age of 50. The increase of the X-ray tube current from automatic exposure control systems due to thyroid shielding can be avoided by placing the shielding collar after acquiring the scout images. Should real-time tube current modulation be implemented in dental CBCT imaging in the future, perspectives regarding the appropriate use of shielding may change according to current trends in CT. In view of the manifestation of metal artefacts, shielding is best avoided if radiological evaluation of tissues below the lower border of the mandible is needed.

scholarly journals Dose optimization for assessment of periodontal structures in cone beam CT examinations

2017 ◽  
Vol 46 (3) ◽  
pp. 20160311 ◽  
Author(s):  
Ayman Al-Okshi ◽  
Chrysoula Theodorakou ◽  
Christina Lindh
Keyword(s):  
Cone Beam Ct ◽  
Cone Beam ◽  
Dose Optimization

A meta-review using the ROBIS tool of effective doses in dental and maxillofacial cone beam CT

2021 ◽  
pp. 20210042
Author(s):  
Ayman Al-Okshi ◽  
Keith Horner ◽  
Madeleine Rohlin
Keyword(s):  
Image Quality ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Quality Of Reporting ◽  
Eligibility Criteria ◽  
Study Selection ◽  
Significant Difference ◽  
Meta Review ◽  
Effective Doses ◽  
Operating Potential

Objectives: To apply the ROBIS tool for assessment of risk of bias (RoB) in systematic reviews (SRs) in a meta-review on effective doses (EDs) in dental and maxillofacial cone beam CT. Methods: Three electronic databases and reference lists of included SRs were searched. Eligible SRs were classified as having low, high or unclear RoB. Findings of SRs were synthesised and data from primary studies combined to relate ED to field of view (FOV) and operating potential (kV). Results: Seven SRs were included: three displayed low RoB, three high and one had unclear RoB. Only one SR related ED to image quality. Deficiencies in reporting of eligibility criteria, study selection and synthesis of results in SRs were identified. Median ED for three FOV categories differed significantly (p < 0.001) but there was no significant difference in median ED between three operating potential groups. Conclusion: The ROBIS tool should have a role for meta-reviews of different aspects of radiology. The disappointing results for RoB might be remedied by developing standards to improve the quality of reporting of primary dosimetry studies and of SRs. There is a continuing need to perform dosimetry studies, although relating ED to image quality or diagnostic accuracy would add value. Advances in knowledge: This meta-review is the first in radiology to implement ROBIS to assess RoB in SRs of ED and identified that the trustworthiness of some SRs is questionable. The results underpin the importance of FOV dimensions as a determinant of ED in CBCT.

scholarly journals Precision of cone beam CT to assess periodontal bone defects: a systematic review and meta-analysis

2018 ◽  
Vol 47 (2) ◽  
pp. 20170084 ◽  
Author(s):  
Letícia Fernanda Haas ◽  
Glaucia Santos Zimmermann ◽  
G De Luca Canto ◽  
Carlos Flores-Mir ◽  
Márcio Corrêa
Keyword(s):  
Systematic Review ◽  
Meta Analysis ◽  
Cone Beam Ct ◽  
Bone Defects ◽  
Cone Beam ◽  
Periodontal Bone Defects

scholarly journals Effective dose of cone beam CT (CBCT) of the facial skeleton: a systematic review

2015 ◽  
Vol 88 (1045) ◽  
pp. 20140658 ◽  
Author(s):  
A Al-Okshi ◽  
C Lindh ◽  
H Salé ◽  
M Gunnarsson ◽  
M Rohlin
Keyword(s):  
Systematic Review ◽  
Effective Dose ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Facial Skeleton
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