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Annika Ekestubbe - One of the best experts on this subject based on the ideXlab platform.

  • absorbed organ and effective doses from digital intra oral and panoramic Radiography applying the icrp 103 recommendations for effective dose estimations
    British Journal of Radiology, 2016
    Co-Authors: Christina M Granlund, Anne Thilanderklang, Betȕl Ylhan, Sara Lofthaghansen, Annika Ekestubbe
    Abstract:

    Objective:During Dental Radiography, the salivary and thyroid glands are at radiation risk. In 2007, the International Commission on Radiological Protection (ICRP) updated the methodology for determining the effective dose, and the salivary glands were assigned tissue-specific weighting factors for the first time. The aims of this study were to determine the absorbed dose to the organs and to calculate, applying the ICRP publication 103 tissue-weighting factors, the effective doses delivered during digital intraoral and panoramic Radiography.Methods:Thermoluminescent dosemeter measurements were performed on an anthropomorphic head and neck phantom. The organ-absorbed doses were measured at 30 locations, representing different radiosensitive organs in the head and neck, and the effective dose was calculated according to the ICRP recommendations.Results:The salivary glands and the oral mucosa received the highest absorbed doses from both intraoral and panoramic Radiography. The effective dose from a full-mo...

Jae-seo Lee - One of the best experts on this subject based on the ideXlab platform.

  • diagnostic reference levels in intraoral Dental Radiography in korea
    Imaging Science in Dentistry, 2012
    Co-Authors: Eunkyung Kim, Suk-ja Yoon, Wonjeong Han, Jinwoo Choi, Yunhoa Jung, Jae-seo Lee
    Abstract:

    Purpose: The objectives of this study were to survey the radiographic exposure parameters, to measure the patient doses for intraoral Dental Radiography nationwide, and thus to establish the diagnostic reference levels (DRLs) in intraoral Dental X-ray examination in Korea. Materials and Methods: One hundred two intraoral Dental radiographic machines from all regions of South Korea were selected for this study. Radiographic exposure parameters, size of hospital, type of image receptor system, installation duration of machine, and type of Dental X-ray machine were documented. Patient entrance doses (PED) and dose-area products (DAP) were measured three times at the end of the exit cone of the X-ray unit with a DAP meter (DIAMENTOR M4-KDK, PTW, Freiburg, Germany) for adult mandibular molar intraoral Dental Radiography, and corrections were made for room temperature and pressure. Measured PED and DAP were averaged and compared according to the size of hospital, type of image receptor system, installation duration, and type of Dental Xray machine. Results: The mean exposure parameters were 62.6 kVp, 7.9 mA, and 0.5 second for adult mandibular molar intraoral Dental Radiography. The mean patient dose was 2.11 mGy (PED) and 59.4 mGycm 2 (DAP) and the third quartile one 3.07 mGy (PED) and 87.4 mGycm 2 (DAP). Doses at university Dental hospitals were lower than those at Dental clinics (p⁄0.05). Doses of digital Radiography (DR) type were lower than those of film-based type (p⁄0.05). Conclusion: We recommend 3.1 mGy (PED), 87.4 mGycm 2 (DAP) as the DRLs in adult mandibular molar intraoral Dental Radiography in Korea. (Imaging Sci Dent 2012; 42 : 237-42)

  • Reference dose levels for Dental panoramic Radiography in Gwangju, South Korea
    Radiation protection dosimetry, 2010
    Co-Authors: Jae-seo Lee, Young-hee Kim, Suk-ja Yoon, Byung-cheol Kang
    Abstract:

    This study assessed the reference dose levels for Dental panoramic Radiography in Gwangju city, South Korea based on the dose width product (DWP) and compared them with those already established elsewhere. A total of 44 panoramic Dental radiographic sets (36 digital and 8 analogue panoramic sets) in 41 Dental clinics in Gwangju city were chosen. The third quartile DWP was determined from 429 surface dose measurements of the adult surface dose in panoramic Dental Radiography. The third quartile DWP for panoramic Radiography was 60.1 mGy mm. The proposed DWP reference levels of 60.1 mGy mm were less than or equal to those previously reported in other countries, such as Italy and UK, and acceptable for panoramic Radiography in Gwangju, South Korea.

M A Geibel - One of the best experts on this subject based on the ideXlab platform.

  • quality assurance in digital Dental Radiography justification and dose reduction in Dental and maxillofacial radiology
    International journal of computerized dentistry, 2012
    Co-Authors: F Hellstern, M A Geibel
    Abstract:

    Objective To evaluate the implementation of quality assurance requirements for digital Dental Radiography in routine clinical practice. The results should be discussed by radiation protection authorities in the context of the relevant legal requirements and current debates on radiation protection. Materials and methods Two hundred digital Dental radiographs were randomly selected from the digital database of the Department of Dentistry's Dental and Maxillofacial Surgery Clinic, Ulm University, and evaluated for various aspects of image quality and compliance with radiographic documentation requirements. The Dental films were prepared by different radiology assistants (RAs) using one of two digital intraoral radiographic systems: Sirona Heliodent DS, 60 kV, focal spot size: 0.7 mm (group A) or KaVo Gendex 765 DC, 65 kV, focal spot size: 0.4 mm (group B). Results Radiographic justification was documented in 70.5% of cases, and the radiographic findings in 76.5%. Both variables were documented in the patient records as well as in the software in 14% of cases. Clinical documentation of the required information (name of the responsible dentist and radiology assistant, date, patient name, department, tube voltage, tube current, exposure time, type of radiograph, film size, department and serial number of the Dental radiograph) was 100% complete in all cases. Moreover, the department certified according to DIN ISO 9001:2008 specifications demonstrated complete clinical documentation of radiographic justifications and radiographic findings. The entire dentition was visible on 83% of the digital films. The visible area corresponded to the target region on 85.7% of the digital Dental radiographs. Seven to 8.5% of the images were classified as "hypometric" or "hypermetric". Conclusions This study indicates that improvements in radiology training and continuing education fordentists and Dental staff performing x-ray examinations are needed to ensure consistent high quality of digital Dental Radiography. Implementation of internal radiological quality assurance programs, as required by public law in Germany since 2010 (SGB V), would appear prudent.

J Robertson - One of the best experts on this subject based on the ideXlab platform.

  • techniques for measurement of dose width product in panoramic Dental Radiography
    British Journal of Radiology, 2006
    Co-Authors: P Doyle, C J Martin, J Robertson
    Abstract:

    Dose width product (DWP) is the quantity recommended for assessment of patient dose for panoramic Dental Radiography. It is the product of the absorbed dose in air in the X-ray beam integrated over an exposure cycle and the width of the beam, both measured at the receiving slit. A robust method for measuring the DWP is required in order to facilitate optimization of practices and enable comparison of dose levels at different centres. In this study, three techniques for measuring the DWP have been evaluated through comparison of results from 20 orthopantomographic units. These used a small in-beam semiconductor detector and X-ray film, a pencil ionization chamber and an array of thermoluminescent dosemeters (TLDs). The mean results obtained with the three techniques agreed within +/-6%. The technique employing a pencil ionization chamber of the type used for dose assessment of CT scanners is the simplest and most reliable method. The in-beam detector and film method has larger errors both from positioning the radiation detector and from measurement of X-ray beam width, which should be the full width at half maximum obtained from a scan of the film optical density. The TLD array method was accurate, but more time consuming to carry out. The mean DWP for the units studied was 65 mGy mm and the mean dose-area product was 89 mGy cm2. The DWP for 30% of the units tested exceeded the diagnostic reference dose of 65 mGy mm, recommended by the National Radiological Protection Board.

Christina M Granlund - One of the best experts on this subject based on the ideXlab platform.

  • absorbed organ and effective doses from digital intra oral and panoramic Radiography applying the icrp 103 recommendations for effective dose estimations
    British Journal of Radiology, 2016
    Co-Authors: Christina M Granlund, Anne Thilanderklang, Betȕl Ylhan, Sara Lofthaghansen, Annika Ekestubbe
    Abstract:

    Objective:During Dental Radiography, the salivary and thyroid glands are at radiation risk. In 2007, the International Commission on Radiological Protection (ICRP) updated the methodology for determining the effective dose, and the salivary glands were assigned tissue-specific weighting factors for the first time. The aims of this study were to determine the absorbed dose to the organs and to calculate, applying the ICRP publication 103 tissue-weighting factors, the effective doses delivered during digital intraoral and panoramic Radiography.Methods:Thermoluminescent dosemeter measurements were performed on an anthropomorphic head and neck phantom. The organ-absorbed doses were measured at 30 locations, representing different radiosensitive organs in the head and neck, and the effective dose was calculated according to the ICRP recommendations.Results:The salivary glands and the oral mucosa received the highest absorbed doses from both intraoral and panoramic Radiography. The effective dose from a full-mo...