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

doi:10.1007/s12194-019-00506-w

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 journal › Article › peer-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 language	English
Journal	Radiological Physics and Technology
DOIs	https://doi.org/10.1007/s12194-019-00506-w
Publication status	Published - 2019 Jan 1
Externally published	Yes

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

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. ",

keywords = "Computed tomography, Frequency response, Image reconstruction, Modulation transfer function, Noise power spectrum",

author = "Kazuhiro Sato and Ryota Kageyama and Yu Tomita and Yumi Takane and Haruo Saito",

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T1 - Estimation and validation of the frequency responses of a scanner system and an image reconstruction system in X-ray computed tomography

AU - Sato, Kazuhiro

AU - Kageyama, Ryota

AU - Tomita, Yu

AU - Takane, Yumi

AU - Saito, Haruo

PY - 2019/1/1

Y1 - 2019/1/1

N2 - 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.

AB - 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.

KW - Computed tomography

KW - Frequency response

KW - Image reconstruction

KW - Modulation transfer function

KW - Noise power spectrum

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