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Comparison of absorbed doses and organ doses measured with thermoluminescent dosimeters and Gafchromic film for cone beam computed tomography examination of the posterior mandibular region in a head phantom.
Cederhag, Josefine; Kadesjö, Nils; Nilsson, Mats; Alstergren, Per; Shi, Xie-Qi; Hellén-Halme, Kristina.
Afiliación
  • Cederhag J; Department of Oral and Maxillofacial Radiology, Faculty of Odontology, Malmö University, Malmö, Sweden. Electronic address: Josefine.cederhag@mau.se.
  • Kadesjö N; Medical Radiation Physics, Karolinska University Hospital, Stockholm, Sweden.
  • Nilsson M; Department of Medical Radiation Physics, Lund University, Malmö, Sweden.
  • Alstergren P; Department of Orofacial Pain and Jaw Function, Faculty of Odontology, Malmö University, Malmö, Sweden; Specialized Pain Rehabilitation, Skåne University Hospital, Lund, Sweden; Scandinavian Center for orofacial Neurosciences, Malmö University, Malmö, Sweden.
  • Shi XQ; Department of Oral and Maxillofacial Radiology, Faculty of Odontology, Malmö University, Malmö, Sweden; Section of Oral and Maxillofacial Radiology, Department of Clinical Dentistry, University of Bergen, Bergen, Norway.
  • Hellén-Halme K; Department of Oral and Maxillofacial Radiology, Faculty of Odontology, Malmö University, Malmö, Sweden.
Oral Surg Oral Med Oral Pathol Oral Radiol ; 136(6): 769-776, 2023 12.
Article en En | MEDLINE | ID: mdl-37625926
OBJECTIVES: We aimed to map the correlation between thermoluminescent dosimeters (TLDs) and Gafchromic film for measuring absorbed doses and to compare minimum, maximum, and mean absorbed doses over larger regions of interest and at various craniofacial organs and tissues during cone beam computed tomography (CBCT) exposure of the mandibular third molar region. STUDY DESIGN: We positioned TLDs at 75 measurement points in a head phantom. Gafchromic film was cut to the same shape as the 5 levels of the phantom and was placed on top of the TLDs. Both dosimetry methods thus included the surface of each level simultaneously. CBCT scans were made using a 5 × 5 cm field of view and a rotation angle of 200°. Measurements included absorbed dose distributions, doses at all 75 points, and minimum, maximum, and mean doses within organs and tissues. RESULTS: The correlation of point-dose measurements at all TLD sites with doses measured on film was strong (R2 = 0.9687), with greatest correlation at lower doses (<2 mGy). Large deviations between TLD and film measurements of minimum and maximum doses and absorbed doses to the organs occurred at all 5 levels. TLD positioning failed to cover several organ sites; for these, only absorbed dose measurements from the film were available. CONCLUSIONS: TLDs were unable to sample dose distributions and gradients accurately. The characteristics of Gafchromic LD-V1 film make it a favorable alternative in dental CBCT dosimetry.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Dosimetría Termoluminiscente / Dosímetros de Radiación Límite: Humans Idioma: En Revista: Oral Surg Oral Med Oral Pathol Oral Radiol Año: 2023 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Dosimetría Termoluminiscente / Dosímetros de Radiación Límite: Humans Idioma: En Revista: Oral Surg Oral Med Oral Pathol Oral Radiol Año: 2023 Tipo del documento: Article Pais de publicación: Estados Unidos