Estimation and validation of the frequency responses of a scanner system and an image reconstruction system in X-ray computed tomography

Kazuhiro Sato, Ryota Kageyama, Yu Tomita, Yumi Takane, Haruo Saito

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In computed tomography, factors that theoretically affect the modulation transfer function (MTF) in the region near the isocenter are the frequency responses of the scanner system (MTF S ) and reconstruction processing (MTF A ). Although MTF S and MTF A are performance indices that are not disclosed to the users, both can be estimated by the measured MTF with the use of theoretical formulas. In this study, we proposed two methods to obtain the MTF S and MTF A , and confirm their validity. The first method to obtain the MTF S and MTF A uses a theoretical formula and the measured MTF. Another method uses the measured MTF and the noise power spectrum. In both the methods, the MTF S and MTF A were obtained separately. By our proposed methods, performance indices that are not usually disclosed to the users can be known.

Original languageEnglish
JournalRadiological Physics and Technology
DOIs
Publication statusPublished - 2019 Jan 1
Externally publishedYes

Keywords

  • Computed tomography
  • Frequency response
  • Image reconstruction
  • Modulation transfer function
  • Noise power spectrum

ASJC Scopus subject areas

  • Radiation
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Radiology Nuclear Medicine and imaging

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