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Article History

Received: 28 September 2025

Revised: 21 April 2026

Accepted: 6 May 2026

First Online: 13 May 2026

Declarations

:

: Kobayashi is an employee at Nemoto Kyorindo, Japan. The rest of the authors do not have any conflicts of interest to declare.

: This study was conducted based on a plan approved by the Ethics Committee of Juntendo University Urayasu Hospital (approval number: E21-0167) for evaluating the usefulness of dilution contrast imaging using a two-step injection method with dual injector and a new dilution solution using a phantom. Visual evaluation was conducted with the evaluators’ health conditions taken into consideration, and the research method was explained to them (approval number: E21-0167). This study was also performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.

: The evaluators were given a thorough 10-min explanation before the study, and informed verbal consent was obtained regarding the contents of the experiment and use of the results.

: Not applicable.