Measurement of dose in panoramic dental radiology.

Williams, J R; Montgomery, A.

doi:10.1259/bjr.73.873.11064656

Cited by 41 publications

(19 citation statements)

References 2 publications

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“…Dental radiology is being extensively used especially after the consolidation of the dental implant technique (2).Therefore radiographic findings play an important role. Entrance surface dose(ESD) ,(named skin absorbed dose in current article), and dose-area product (DAP) are the most important parameters measured in diagnostic Radiology (3).Due to increasing radiological examinations, patient protection against X-rays is important. Therefore, all national and international forums have specific recommendations to further protection of patients.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

confidence: 99%

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

Moudi¹

2014

SJCM

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“…Au niveau de la comparaison du risque radiologique, la situation est plus complexe puisque l'irradiation de la thyroïde varie sensiblement d'une installation ou d'un positionnement à l'autre. Pour tenir compte des différentes situations d'irradiation, un facteur de conversion moyen de 0,06 mSv Gy -1 cm -2 est proposé dans la littérature (Williams et Montgomery, 2000). Un examen sur un OPG récent délivre ainsi une dose efficace d'environ 5 µSv au patient.…”

Section: Discussionunclassified

“…Un facteur de conversion moyen de 0,03 mSv Gy -1 cm -2 est utilisé dans cette étude. (Williams et Montgomery, 2000). En outre, des mesures par TLD ont été effectuées sur l'OPG analogique le plus récent pour évaluer la répartition de la dose à la peau.…”

Section: Tableau IIunclassified

Situation actuelle de l’irradiation du patient en radiologie dentaire

Baechler¹,

Monnin²,

Aroua³

et al. 2006

Radioprotection

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Current situation of doses delivered to the patients in the field of dental radiology.The purpose of this paper is to present an overview of the doses delivered to the patients in the field of dental radiology. The technology progress in medical imaging will be discussed from a dose perspective. In this work, patient dosimetry has been performed for intra-oral, panoramic and CT dental examinations. Doses were estimated using appropriate dosimetric indicators such as the entrance surface kerma (ESK) and the kerma area product (KAP). These indicators are easily measurable and enable to estimate the effective dose for a standard patient. KAP values were measured for two intra-oral systems using D and E/F speed dental films, RADIOPROTECTION -VOL. 41 -N° 3 (2006) as well as a digital system based on the CCD technology. In addition, the KAP was measured on three orthopantomograms (OPGs) of various generations. Finally, in order to assess the dose delivered during dental implants planning, the kerma length product (KLP) and the computed tomography dose index (CTDI w ) were determined for a CT scanner using the Dentascan protocol and a new DVT (Digital Volume Tomography) dedicated system. Using E/F speed instead of D speed films allowed to reduce the KAP by a factor of 2 without significant loss of image quality. A further dose reduction by a factor of 6 was possible with digital systems but with an important degradation of the spatial resolution (variation of the MTF at 50% from 13 mm -1 to 5 mm -1 ). KAP measurements on OPGs showed that old systems delivered doses three times higher than a more recent devices. The new dedicated tomographic system enabled a reduction of the patient dose by a factor of 18 when compared with the Dentascan CT system.

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“…In the case of the cervical spine and the thyroid gland on the left side (the dose measured in the phantom), the right and left lens of the eye, as well as at the height of the right and left eye lenses (the surface of the phantom), there was no measured statistical difference in absorbed dose values (p > 0.05). Most papers concerning radiation dose estimation in panoramic radiography draw comparisons between conventional and digital panoramic radiography [11,[18][19][20]. These studies have concluded that any dose reduction results in an image quality difference with a predominance of the conventional panoramic device [21].…”

Section: Eye Lens Exposure During Extraoral Dental Diagnosticsmentioning

confidence: 99%

Absorbed doses for patients undergoing panoramic radiography, cephalometric radiography and CBCT

Wrzesień

Olszewski

2017

Int J Occup Med Environ Health

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Objectives: Contemporary dental radiology offers a wide spectrum of imaging methods but it also contributes to an increase in the participation of dental radiological diagnosis in the patient's exposure to ionizing radiation. The aim of this study is to determine the absorbed doses of the brain, spinal column, thyroid and eye lens for patients during panoramic radiography, cephalometric radiography and cone beam computed tomography (CBCT). Material and Methods: The thermoluminescent dosimetry and anthropomorphic phantom was used for measuring the doses. The 15 panoramic, 4 cephalometric and 4 CBCT exposures were performed by placing high-sensitivity thermoluminescent detectors (TLD) in 18 anatomical points of the phantom. Results: The maximum absorbed dose recorded during performed measurements corresponds to the point representing the brainstem and it is 10 mGy. The dose value recorded by the TLD placed in the thyroid during CBCT imaging in relation to the panoramic radiography differs by a factor of 13.5. Conclusions: Cone beam computed tomography, in comparison with panoramic or cephalometric imaging technique, provides higher radiation doses to the patients. Int J Occup Med Environ Health 2017;30(5): [705][706][707][708][709][710][711][712][713]

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Measurement of dose in panoramic dental radiology.

Cited by 41 publications

References 2 publications

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

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

Situation actuelle de l’irradiation du patient en radiologie dentaire

Absorbed doses for patients undergoing panoramic radiography, cephalometric radiography and CBCT

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