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Article History

Received: 2 March 2020

Accepted: 4 May 2020

First Online: 12 May 2020

Compliance with ethical standards

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: Ewoud J. Smit is a speaker bureau of Canon Medical Systems, and receives research grant from Canon Medical Systems. He has a pending patent of 4D-SF, and gives the license to Canon Medical Systems. Mathias Prokop is a speaker bureau of Bayer, Bracco, Canon Medical Systems, and Siemens Healthineers, and receives research grant from Canon Medical Systems and Siemens Healthineers. He has a pending patent of 4D-SF, and gives the license to Canon Medical Systems. Takanori Kouchi declares that he has no conflict of interest. Yuki Tanabe declares that he has no conflict of interest. Teruhito Kido declares that he has no conflict of interest. Akira Kurata declares that he has no conflict of interest. Yoshihiro Kouchi declares that he has no conflict of interest. Hikaru Nishiyama declares that he has no conflict of interest. Teruyoshi Uetani declares that he has no conflict of interest. Shuntaro Ikeda declares that he has no conflict of interest. Osamu Yamaguchi declares that he has no conflict of interest. Teruhito Mochizuki declares that he has no conflict of interest.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study formal consent is not required.

: The requirement for informed consent was waived by the institutional ethics committee (Registration Number: 1905007).