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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 LU ; Alstergren, Per ; Shi, Xie Qi and Hellén-Halme, Kristina (2023) In Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology 136(6). p.769-776
Abstract

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... (More)

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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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
volume
136
issue
6
pages
8 pages
publisher
Elsevier
external identifiers
  • pmid:37625926
  • scopus:85168847369
ISSN
2212-4403
DOI
10.1016/j.oooo.2023.07.006
language
English
LU publication?
yes
id
6e922cf9-c520-4ebd-94f6-2baccae263df
date added to LUP
2023-12-22 15:29:36
date last changed
2024-04-06 22:15:00
@article{6e922cf9-c520-4ebd-94f6-2baccae263df,
  abstract     = {{<p>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 (R<sup>2</sup> = 0.9687), with greatest correlation at lower doses (&lt;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.</p>}},
  author       = {{Cederhag, Josefine and Kadesjö, Nils and Nilsson, Mats and Alstergren, Per and Shi, Xie Qi and Hellén-Halme, Kristina}},
  issn         = {{2212-4403}},
  language     = {{eng}},
  number       = {{6}},
  pages        = {{769--776}},
  publisher    = {{Elsevier}},
  series       = {{Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology}},
  title        = {{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}},
  url          = {{http://dx.doi.org/10.1016/j.oooo.2023.07.006}},
  doi          = {{10.1016/j.oooo.2023.07.006}},
  volume       = {{136}},
  year         = {{2023}},
}