Physical and visual evaluations of CT image quality of large low-contrast objects with visual model-based iterative reconstruction technique: a phantom study

Hideki Shibata, Kosuke Matsubara, Yasuki Asada, Akihiro Takemura, Isao Kozawa

研究成果: ジャーナルへの寄稿学術論文査読

1 被引用数 (Scopus)

抄録

We aimed to verify whether the image quality of large low-contrast objects can be improved using visual model-based iterative reconstruction (VMR) while maintaining the visibility of conventional filtered back projection (FBP) and reducing radiation dose through physical and visual evaluation. A 64-row multi-slice CT system with SCENARIA View (FUJIFILM healthcare Corp. Tokyo, Japan) was used. The noise power spectrum (NPS), task-based transfer function (TTF), and signal-to-noise ratio (SNR) were physically evaluated. A low contrast object as a substitute for a liver mass was visually evaluated. In the noise measurement, STD1 showed an 18% lower noise compared to FBP. STR4 was able to reduce noise by 58% compared to FBP. The NPS of VMR was similar to those of FBP from low to high spatial frequency. The NPS of VMR reconstructions showed a similar variation with frequency as FBP reconstructions. STD1 showed the highest 10% TTF, and higher 10% TTF was observed with lower VMR level. The SNR of VMR was close to that of FBP, and higher SNR was observed with higher VMR level. In the results of the visual evaluation, there was no significant difference in visual evaluation between STD1 and FBP (p = 0.99) and between STD2 and FBP (p = 0.56). We found that the NPS of VMR images was similar to that of FBP images, and it can reduce noise and radiation dose by 25% and 50%, respectively, without decreasing the visual image quality compared to FBP.

本文言語英語
ページ(範囲)141-150
ページ数10
ジャーナルPhysical and Engineering Sciences in Medicine
46
1
DOI
出版ステータス出版済み - 03-2023

All Science Journal Classification (ASJC) codes

  • バイオテクノロジー
  • 放射線技術および超音波技術
  • 生物理学
  • 生体医工学
  • 器械工学
  • 放射線学、核医学およびイメージング

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