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SU‐FF‐T‐238: GafChromic XR‐QA Film in Testing Panoramic Dental Radiography
Author(s) -
Chu R,
Lam T,
Liang Y
Publication year - 2007
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2760899
Subject(s) - dosimetry , pencil (optics) , radiography , ionization chamber , computed radiography , materials science , dental radiography , nuclear medicine , field size , dose profile , image quality , optics , medical physics , medicine , physics , computer science , ion , radiology , computer vision , quantum mechanics , image (mathematics) , ionization
Purpose: The location and the field size of the incident X‐ray beam in panoramic dental radiography most often cannot be ascertain visually. These parameters are needed for quality control testing and dosimetry determination. To alleviate this problem, GafChromic XR‐QA film was tested on two panoramic systems. Method and Materials: For each system, the dose‐area product was computed with the length of a cross section image of the incident beam and the exposure measurement with a pencil ion chamber. The result was confirmed by direct analysis of a dose distribution on a film. Placement of the ion chamber was determined by these images. The dose‐area products were thus determined to be 713 cGy.mm 2 and 721 cGy.mm 2 . From these values, the effective doses were computed to be 5.2 μSv and 5.3 μSv respectively. Results and Conclusion: This version of radiochromic film has thus been demonstrated to be a useful complement to a pencil ion chamber in the testing of a panoramic radiography system.