Evaluation of the Use of a Molybdenum Filter for Dose Reduction in Pediatric Digital X-ray Imaging View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2020-11-19

AUTHORS

Su-Jin Park, Jaehyuk Kim, Jong Chul Han, Jung-Ha Kim, Jung-Min Kim, Jong-Pil Kim, Minkook Cho, Jung Woo Kim

ABSTRACT

Pediatric dosimetry requires extra attention as young children are three times more sensitive to radiation than the average population. Soft tissues of patients absorb low-energy photons without affecting useful diagnostic information. X-ray filters can decrease the exposure dose of radiation by removing low-energy photons from the X-ray beam. Several studies have dealt with the advantages of a conventional filter, copper (Cu), in pediatric digital X-ray radiography. Only a few studies, however, have examined the use of molybdenum (Mo) filters and their impact on the radiation dose and image quality in pediatric digital X-ray imaging. In this study, we investigated the impact of a Mo filter on the image quality and the entrance surface exposure (ESE) in pediatric X-ray imaging and assessed the potential of additional dose reduction compared to a conventional Cu filter. The performance of the Mo filter was investigated and compared with that of Cu filter. Two types of phantoms were used: a customized quantitative phantom (Phantom A) for quantitative comparison and a computational anthropomorphic extended cardiac-torso (XCAT) phantom for qualitative comparison. A clinical radiography system was modeled, and the clinical setting for pediatric chest X-ray imaging was considered. Geant4 simulations using Monte Carlo toolkits were performed to obtain the images for pediatric chest X-ray examinations. Quantitative and qualitative comparisons using the quantitative phantom (Phantom A) and the XCAT phantom, respectively, were performed for both filters. From the customized quantitative phantom study, the ESE for the Mo filter was compared with that for the Cu filter when contrast-to-noise ratio (CNR) was equal. In addition, to validate our Monte Carlo model, we compared simulated and experimentally acquired images. From the results, the ESE for the Cu filter was 22.62 μGy while the ESE for the Mo filter was 18.18 μGy for 5-mm soft tissue. The use of a Mo filter results in a reduction in the dose by 19.60%. From the XCAT phantom study, the image for the Mo filter was superior to that for Cu filter in terms of noise and recognition of blood vessels. The performance characteristics of the Mo filter were evaluated in terms of image quality and radiation dose by comparing those characteristics to the ones for a conventional Cu filter. Our results demonstrated that the use of the Mo filter can significantly reduce the radiation dose. Based on this result, Mo filters are recommended for use in pediatric digital X-ray imaging. More... »

PAGES

1253-1259

Identifiers

URI

http://scigraph.springernature.com/pub.10.3938/jkps.77.1253

DOI

http://dx.doi.org/10.3938/jkps.77.1253

DIMENSIONS

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