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Published on: February 20, 2021
Radiochromic films for dental CT dosimetry: a feasibility study
O Rampado1, S D Bianchi2, A Peruzzo Cornetto1
1S.C. Fisica Sanitaria, A.O.U. San Giovanni Battista di Torino, Corso Bramante 88, 10126 Torino, Italy.
Summary
Radiochromic films offer a feasible alternative for dental CT dose evaluations, showing good agreement with traditional thermoluminescent dosimeters (TLD). This advanced dosimetry method allows for more comprehensive dose assessments in dental imaging.
Area of Science:
- Medical Physics
- Radiological Dosimetry
- Dental Imaging
Background:
- Dental CT dose assessments traditionally rely on thermoluminescent dosimeters (TLD) within anthropomorphic phantoms.
- Recently developed radiochromic films, such as GAFCHROMIC XR-QA, offer high sensitivity for X-ray diagnostics.
- Radiochromic films present potential advantages, including adjustable sample sizes for more comprehensive dosimetry.
Purpose of the Study:
- To investigate the feasibility of utilizing radiochromic films for dental CT dose evaluations.
- To compare the performance of radiochromic films against TLD in dental CT dosimetry.
- To assess the repeatability and accuracy of radiochromic films in dental CT dose measurements.
Main Methods:
- Radiochromic film strips (5mm x 25mm) and TLD were simultaneously used in an Alderson Rando anthropomorphic phantom.
- Dental CT dose measurements were conducted using a 16-slice CT and a cone beam CT.
- Organ equivalent and effective doses were calculated using ICRP 103 weighting factors, with procedures repeated for repeatability analysis.
Main Results:
- A strong linear correlation (r>0.99) was observed between radiochromic film and TLD absorbed dose measurements.
- Average differences between dosimeter measurements were 7%, with a maximum difference of 25%.
- Repeatability was comparable above 15 mGy (5% uncertainty), while radiochromic films showed greater dispersion below this threshold (10% uncertainty).
Conclusions:
- Radiochromic films are feasible for dental CT dosimetry, demonstrating good agreement with TLD results.
- The use of radiochromic films offers potential advantages for more extensive dose investigations in dental CT.
- Effective dose values obtained using radiochromic films were comparable to TLD measurements for both cone beam and multislice CT scanners.
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