A simple method for calibrating pixel values of the CT localizer radiograph for calculating water-equivalent diameter and size-specific dose estimate

Choirul Anam, Toshioh Fujibuchi, Takatoshi Toyoda, Naoki Sato, Freddy Haryanto, Rena Widita, Idam Arif, Geoff Dougherty

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The purpose of this study is to establish the relationship between the pixel value (I) of the CT localizer radiograph and waterequivalent thickness (tw) in a straightforward procedure. We used a body CTDI phantom, which was scanned in the AP and LAT projections. After transformation from the pixel values of the images to tw, water-equivalent diameter (Dw) and sizespecific dose estimate were calculated on an anthropomorphic phantom and 30 patients retrospectively. We found a linear correlation between I and tw, with R2 ≥ 0.980. The Dw values based on the CT localizer radiograph were comparable to those calculated using axial images. The Dw difference for the anthropomorphic phantom between AP projection and axial images was 5.4 ± 4.2%, and between LAT projection and axial images was 6.7 ± 5.3%. The Dw differences for the patients between CT localizer radiograph and axial images was 2.3 ± 3.2%.

Original languageEnglish
Pages (from-to)158-168
Number of pages11
JournalRadiation Protection Dosimetry
Volume179
Issue number2
DOIs
Publication statusPublished - Apr 1 2018

All Science Journal Classification (ASJC) codes

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

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