Progress in Medical Physics (한국의학물리학회지:의학물리)

Korean Society of Medical Physics (한국의학물리학회)
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Effect of Bead Device Diameter on Z-Resolution Measurement in Tomosynthesis Images: A Simulation Study

  • Ryohei Fukui (Department of Radiological Technology, Faculty of Health Sciences, Okayama University) ;
  • Miho Numata (Department of Radiological Technology, Okayama University Hospital) ;
  • Saki Nishioka (Department of Radiological Technology, Okayama University Hospital) ;
  • Ryutarou Matsuura (Department of Radiological Technology, Faculty of Health Sciences, Okayama University) ;
  • Katsuhiro Kida (Department of Radiological Technology, Faculty of Health Sciences, Okayama University) ;
  • Sachiko Goto (Department of Radiological Technology, Faculty of Health Sciences, Okayama University)
  • Received : 2022.07.08
  • Accepted : 2022.10.24
  • Published : 2022.12.31
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Abstract

Purpose: To clarify the relationship between the diameter of the simulated bead and the Z-resolution of the tomosynthesis image. Methods: A simulated bead was placed on a 1,024×1,024×1,024-pixel base image. The diameters were set to 0.025, 0.05, 0.1, 0.2, 0.3, 0.7, 1.0, and 1.3 mm. A bead was placed at the center of the base image and projected at a simulated X-ray angle range of ±45° to obtain a projected image. A region of interest was placed at the center of the bead image and the slice sensitivity profile (SSP) was obtained by acquiring pixel values in the z-direction. The full width at half maximum of the SSP was defined as the Z-resolution and the frequency response was obtained by the 1-D Fourier transform of the SSP. Results: Z-resolution increased with increasing bead diameter. However, there was no change in Z-resolution between 0.025 and 0.1 mm. The frequency response was similar to that of the Z-resolution, with a significant difference between 0.1 and 0.2 mm diameter. Conclusions: Z-resolution is dependent on the diameter of the bead, which should be selected considering the pixel size of the tomosynthesis image.

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References

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