Publications by authors named "Yasuhiro Sawane"
[Investigation of Imaging Conditions Using Human Body Equivalent Phantom and Neonatal Phantom in Portable Chest Radiography of Newborns].
Nihon Hoshasen Gijutsu Gakkai Zasshi
November 2024
Article Synopsis
- This study focuses on optimizing imaging conditions for portable chest X-rays in newborns using human body equivalent and neonatal phantoms to evaluate raw image quality and radiation dose.* -
- Researchers compared pixel values and incident surface doses by adjusting materials in a simulated phantom and found that using 62 kV and 1.8 mAs provided better results than the standard conditions of 60 kV and 2.0 mAs.* -
- The findings indicate that the simulated phantom effectively mimics clinical scenarios, demonstrating improved imaging conditions while maintaining safety in radiation exposure.*
[Accuracy of Effective Diameter and Water Equivalent Diameter Using Phantoms in Various CT Systems].
Nihon Hoshasen Gijutsu Gakkai Zasshi
November 2024
Article Synopsis
- The study aimed to compare the effective diameter (ED) and water equivalent diameter (WED) from different CT systems against theoretical values and assess their accuracy.
- Using various phantoms, the researchers calculated ED, WED, and size-specific dose estimates (SSDE) across 8 CT systems, revealing less than 5% error in ED but varying accuracy in WED.
- Findings indicated that while ED remained consistent across systems, WED accuracy was influenced by system-specific factors, particularly the shape of CT beds and the presence of upper limbs in scans.
Machine learning-based estimation of patient body weight from radiation dose metrics in computed tomography.
J Appl Clin Med Phys
September 2024
Purpose: Currently, precise patient body weight (BW) at the time of diagnostic imaging cannot always be used for radiation dose management. Various methods have been explored to address this issue, including the application of deep learning to medical imaging and BW estimation using scan parameters. This study develops and evaluates machine learning-based BW prediction models using 11 features related to radiation dose obtained from computed tomography (CT) scans.
View Article and Find Full Text PDF[Usefulness of Post-processing Scatter Correction in Portable Abdominal Radiography Using a Low Ratio Anti-scatter Grid].
Nihon Hoshasen Gijutsu Gakkai Zasshi
October 2019
Objectives: The aim of this study was to evaluate an influence of post-processing scatter correction in portable abdominal radiography using a low ratio anti-scatter grid (grid).
Methods: To assess tube voltage on portable abdominal radiography, a burger phantom was used to measure for inverse of image quality figure (IQF). For evaluation of the influence on using or not the grid, IQF were measured.
[Examination for Effectiveness of Scatter Correction in Portable Chest Radiography].
Nihon Hoshasen Gijutsu Gakkai Zasshi
February 2017
Objectives: The aim of this study was to evaluate the effectiveness of scatter correction in the portable chest radiography.
Methods: Digital radiographies were performed without anti-scatter grid (grid), with the scatter correction and with the grid ratio of 3 : 1 in this study. The scatter fraction and the detectability of low contrast signals were measured using the four acrylic phantoms of different thicknesses.