scholarly journals Establishment of national diagnostic reference levels in dental cone beam computed tomography in Switzerland

2020 ◽  
Vol 49 (6) ◽  
pp. 20190468
Author(s):  
Marine Deleu ◽  
Dorothea Dagassan ◽  
Isabelle Berg ◽  
Julie Bize ◽  
Karl Dula ◽  
...  
Keyword(s):  
Cone Beam Ct ◽  
Product Distribution ◽  
Cone Beam ◽  
Diagnostic Reference Levels ◽  
Wisdom Tooth ◽  
Reference Levels ◽  
Tooth Position ◽  
Single Tooth ◽  
Implant Treatment ◽  
Single Tooth Implant

Objectives: The aim of this study was to establish diagnostic reference levels (DRLs) in the field of dental maxillofacial and ear-nose-throat (ENT) practices using cone beam CT (CBCT) in Switzerland. Methods: A questionnaire was sent to owners of CBCTs in Switzerland; to a total of 612 institutions. The answers were analyzed for each indication, provided that enough data were available. The DRLs were defined as the 75th percentile of air kerma product distribution (PKA). Results: 227 answers were collected (38% of all centers). Third quartile of PKA values were obtained for five dental indications: 662 mGy cm² for wisdom tooth, 683 mGy cm² for single tooth implant treatment, 542 mGy cm² for tooth position anomalies, 569 mGy cm² for pathological dentoalveolar modifications, and 639 mGy cm² for endodontics. The standard field of view (FOV) size of 5 cm in diameter x 5 cm in height was proposed. Conclusions: Large ranges of FOV and PKA were found for a given indication, demonstrating the importance of establishing DRLs as well as FOV recommendations in view of optimizing the present practice. For now, only DRLs for dental and maxillofacial could be defined; because of a lack of ENT data, no DRL values for ENT practices could be derived from this survey.

Cone-beam CT evaluation of morphology, location, and course of mandibular incisive canal: considerations for implant treatment

2013 ◽  
Vol 30 (1) ◽  
pp. 64-75 ◽  
Author(s):  
Kaan Orhan ◽  
Murat Icen ◽  
Secil Aksoy ◽  
Oguz Ozan ◽  
Atilla Berberoglu
Keyword(s):  
Cone Beam Ct ◽  
Cone Beam ◽  
Incisive Canal ◽  
Ct Evaluation ◽  
Implant Treatment

scholarly journals The mandate and work of ICRP Committee 3 on radiological protection in medicine

2018 ◽  
Vol 47 (3-4) ◽  
pp. 142-151
Author(s):  
D.L. Miller ◽  
C.J. Martin ◽  
M.M. Rehani
Keyword(s):  
Computed Tomography ◽  
Medical Imaging ◽  
Ion Beam ◽  
Cone Beam ◽  
Radiological Protection ◽  
Diagnostic Reference Levels ◽  
Reference Levels ◽  
Specific Advice ◽  
Diagnosis Therapy ◽  
Icrp Publication

The mandate of Committee 3 of the International Commission on Radiological Protection (ICRP) is concerned with the protection of persons and unborn children when ionising radiation is used in medical diagnosis, therapy, and biomedical research. Protection in veterinary medicine has been newly added to the mandate. Committee 3 develops recommendations and guidance in these areas. The most recent documents published by ICRP that relate to radiological protection in medicine are ‘Radiological protection in cone beam computed tomography’ (ICRP Publication 129) and ‘Radiological protection in ion beam radiotherapy’ (ICRP Publication 127). A report in cooperation with ICRP Committee 2 entitled ‘Radiation dose to patients from radiopharmaceuticals: a compendium of current information related to frequently used substances’ (ICRP Publication 128) has also been published. ‘Diagnostic reference levels in medical imaging’ (ICRP Publication 135), published in 2017, provides specific advice on the setting and use of diagnostic reference levels for diagnostic and interventional radiology, digital imaging, computed tomography, nuclear medicine, paediatrics, and multi-modality procedures. ‘Occupational radiological protection in interventional procedures’ was published in March 2018 as ICRP Publication 139. A document on radiological protection in therapy with radiopharmaceuticals is likely to be published in 2018. Work is in progress on several other topics, including appropriate use of effective dose in collaboration with the other ICRP committees, guidance for occupational radiological protection in brachytherapy, justification in medical imaging, and radiation doses to patients from radiopharmaceuticals (an update to ICRP Publication 128). Committee 3 is also considering the development of guidance on radiological protection in medicine related to individual radiosusceptibility, in collaboration with ICRP Committee 1.

scholarly journals Comparison of the Hounsfield Unit in CT scan with the Gray Level in cone-beam CT

2019 ◽  
Vol 13 (3) ◽  
pp. 177-182 ◽  
Author(s):  
Tahmineh Razi ◽  
Parya Emamverdizadeh ◽  
Nadia Nilavar ◽  
Sedigheh Razi
Keyword(s):  
Soft Tissues ◽  
Low Cost ◽  
Cone Beam Ct ◽  
Hounsfield Unit ◽  
Cone Beam ◽  
Gray Level ◽  
Hard Tissues ◽  
Short Time ◽  
High Degree ◽  
Implant Treatment

Background. The present study was undertaken to compare the Hounsfield Unit (HU) in computed tomography (CT) with the gray level in CBCT in human tissues. Methods. In this study, 25 different soft and hard tissues were evaluated in 21 patients. CBCT images were taken with Newtom VGi machine (Verona, Italy) and CT images were prepared with Somatom Sensation unit (Siemens, Germany). The HU values of soft and hard tissues were compared with the gray level values of CBCT images. Results. There was a strong correlation between the HU in CT and the gray level in CBCT in soft tissues (P<0.001, R2=0.85) and hard tissues (P<0.001, R2=0.74) and in general (P<0.001, R2=0.91). Conclusion. A high degree of agreement was seen between HU in CT and gray level in CBCT in both hard and soft tissues. Since the gray level in CBCT was similar to HU in CT and can be used as a parameter determine bone density in implant treatment and also to determine the bone type, the CBCT technique is recommended in such cases due to its low radiation dose, short time and low cost compared to CT.

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