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Calculating effecti...
Calculating effective dose on a cone beam computed tomography device: 3D Accuitomo and 3D Accuitomo FPD.
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- Lofthag-Hansen, Sara, 1956 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för odontologi,Institute of Odontology,Public Dental Health, Göteborg
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- Thilander-Klang, Anne, 1959 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kliniska vetenskaper, Avdelningen för radiofysik,Institute of Clinical Sciences, Department of Radiation Physics,Department of Medical Physics and Biomedical Engineering, Sahlgrenska University Hospital, Göteborg, Sweden
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- Ekestubbe, Annika, 1953 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för odontologi,Institute of Odontology,Department of Oral and Maxillofacial Radiology The Sahlgrenska Academy at Göteborg University, Sweden
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- Helmrot, Ebba (author)
- Östergötlands Läns Landsting,Linköpings universitet,Medicinsk radiofysik,Hälsouniversitetet,Radiofysikavdelningen
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- Gröndahl, Kerstin, 1948 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för odontologi,Institute of Odontology,Department of Oral and Maxillofacial Radiology, The Sahlgrenska Academy at Göteborg University, Sweden
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(creator_code:org_t)
- British Institute of Radiology, 2008
- 2008
- English.
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In: Dento maxillo facial radiology. - : British Institute of Radiology. - 0250-832X .- 1476-542X. ; 37:2, s. 72-9
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https://doi.org/10.1...
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Abstract
Subject headings
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- OBJECTIVES: This study evaluates two methods for calculating effective dose, CT dose index (CTDI) and dose-area product (DAP) for a cone beam CT (CBCT) device: 3D Accuitomo at field size 30x40 mm and 3D Accuitomo FPD at field sizes 40x40 mm and 60x60 mm. Furthermore, the effective dose of three commonly used examinations in dental radiology was determined. METHODS: CTDI(100) measurements were performed in a CT head dose phantom with a pencil ionization chamber connected to an electrometer. The rotation centre was placed in the centre of the phantom and also, to simulate a patient examination, in the upper left cuspid region. The DAP value was determined with a plane-parallel transmission ionization chamber connected to an electrometer. A conversion factor of 0.08 mSv per Gy cm(2) was used to determine the effective dose from DAP values. Based on data from 90 patient examinations, DAP and effective dose were determined. RESULTS: CTDI(100) measurements showed an asymmetric dose distribution in the phantom when simulating a patient examination. Hence a correct value of CTDI(w) could not be calculated. The DAP value increased with higher tube current and tube voltage values. The DAP value was also proportional to the field size. The effective dose was found to be 11-77 microSv for the specific examinations. CONCLUSIONS: DAP measurement was found to be the best method for determining effective dose for the Accuitomo. Determination of specific conversion factors in dental radiology must, however, be further developed.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Odontologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Dentistry (hsv//eng)
Keyword
- Cone-Beam Computed Tomography
- instrumentation
- Humans
- Phantoms
- Imaging
- Radiation Dosage
- Radiometry
- Tomography Scanners
- X-Ray Computed
- radiation dosimetry; limited cone beam computed tomography
- Radiological physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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