open access

Vol 25, No 4 (2020)
Published online: 2020-07-01
Submitted: 2019-02-18
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Synthesized effective atomic numbers for commercially available dual-energy CT

Daisuke Kawahara, Shuichi Ozawa, Kazushi Yokomachi, Chikako Fujioka, Tomoki Kimura, Kazuo Awai, Yasushi Nagata
DOI: 10.1016/j.rpor.2020.02.007
·
Rep Pract Oncol Radiother 2020;25(4):692-697.

open access

Vol 25, No 4 (2020)
Published online: 2020-07-01
Submitted: 2019-02-18

Abstract

Purpose

The objective of this study was to assess synthesized effective atomic number (Zeff) values with a new developed tissue characteristic phantom and contrast material of varying iodine concentrations using single-source fast kilovoltage switching dual-energy CT (DECT) scanner.

Methods

A newly developed multi energy tissue characterisation CT phantom and an acrylic phantom with various iodine concentrations of were scanned using single-source fast kilovoltage switching DECT (GE-DECT) scanner. The difference between the measured and theoretical values of Zeff were evaluated. Additionally, the difference and coefficient of variation (CV) values of the theoretical and measured values were compared with values obtained with the Canon-DECT scanner that was analysed in our previous study.

Results

The average Zeff difference in the Multi-energy phantom was within 4.5%. The average difference of the theoretical and measured Zeff values for the acrylic phantom with variation of iodine concentration was within 3.3%. Compared to the results for the single-source Canon-DECT scanner used in our previous study, the average difference and CV of the theoretical and measured Zeff values obtained with the GE-DECT scanner were markedly smaller.

Conclusions

The accuracy of the synthesized Zeff values with GE-DECT had a good agreement with the theoretical Zeff values for the Multi-Energy phantom. The GE-DECT could reduce the noise and the accuracy of the Zeff values than that with Canon-DECT for the varying iodine concentrations of contrast medium.

Advances in knowledge

The accuracy and precision of the Zeff values of the contrast medium with the GE-DECT could be sufficient with human equivalent materials.

Abstract

Purpose

The objective of this study was to assess synthesized effective atomic number (Zeff) values with a new developed tissue characteristic phantom and contrast material of varying iodine concentrations using single-source fast kilovoltage switching dual-energy CT (DECT) scanner.

Methods

A newly developed multi energy tissue characterisation CT phantom and an acrylic phantom with various iodine concentrations of were scanned using single-source fast kilovoltage switching DECT (GE-DECT) scanner. The difference between the measured and theoretical values of Zeff were evaluated. Additionally, the difference and coefficient of variation (CV) values of the theoretical and measured values were compared with values obtained with the Canon-DECT scanner that was analysed in our previous study.

Results

The average Zeff difference in the Multi-energy phantom was within 4.5%. The average difference of the theoretical and measured Zeff values for the acrylic phantom with variation of iodine concentration was within 3.3%. Compared to the results for the single-source Canon-DECT scanner used in our previous study, the average difference and CV of the theoretical and measured Zeff values obtained with the GE-DECT scanner were markedly smaller.

Conclusions

The accuracy of the synthesized Zeff values with GE-DECT had a good agreement with the theoretical Zeff values for the Multi-Energy phantom. The GE-DECT could reduce the noise and the accuracy of the Zeff values than that with Canon-DECT for the varying iodine concentrations of contrast medium.

Advances in knowledge

The accuracy and precision of the Zeff values of the contrast medium with the GE-DECT could be sufficient with human equivalent materials.

Get Citation

Keywords

Effective atomic numbers; Dual-energy CT; Beam-hardening

About this article
Title

Synthesized effective atomic numbers for commercially available dual-energy CT

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 25, No 4 (2020)

Pages

692-697

Published online

2020-07-01

DOI

10.1016/j.rpor.2020.02.007

Bibliographic record

Rep Pract Oncol Radiother 2020;25(4):692-697.

Keywords

Effective atomic numbers
Dual-energy CT
Beam-hardening

Authors

Daisuke Kawahara
Shuichi Ozawa
Kazushi Yokomachi
Chikako Fujioka
Tomoki Kimura
Kazuo Awai
Yasushi Nagata

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