Shape estimation of bowtie filters based on the luminescence from polyethylene terephthalate resin by x-ray irradiation

C. Yamauchi-Kawaura*, K. Fujii, M. Yamauchi, S. Yamamoto, M. Kozuka, N. Ohzawa, N. Suga, N. Ito

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we devised a novel method estimating the bowtie filter shapes by imaging luminescence from a polyethylene terephthalate (PET) resin with X-ray irradiation in a computed tomography (CT) scanner. The luminescence distribution of the PET resin corresponding to the thickness of bowtie filter was imaged using a charge-coupled device camera. On the assumption that the material of bowtie filter is aluminium (Al), the shape of bowtie filters was estimated from the correlation between Al attenuation curves and the angular-dependent luminance attenuation profiles according to the thickness of bowtie filters. Dose simulations based on the estimated bowtie filter shapes were performed using head and body PMMA phantoms with 16 and 32 cm in diameter. The simulated values of head and body weighted CT dose index (CTDIw) based on bowtie filter shape by the luminescence imaging method agreed within ∼9% with the measured values by a dosemeter.

Original languageEnglish
Pages (from-to)432-439
Number of pages8
JournalRadiation Protection Dosimetry
Volume185
Issue number4
DOIs
Publication statusPublished - 2019 Dec 31
Externally publishedYes

ASJC Scopus subject areas

  • Radiation
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Public Health, Environmental and Occupational Health

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