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Article History

Received: 5 June 2025

Revised: 25 September 2025

Accepted: 25 September 2025

First Online: 2 October 2025

Declarations

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: This retrospective chart review study involving human participants was in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The Human Investigation Committee (IRB) of Committee of the Nagoya City Rehabilitation Center Hospital as "Study on the validity of measurement method of radiotracer distribution in the cerebrospinal fluid region" (Project No. 2022002, approved on June 6, 2022) approved this study.

: This research is an observational research using only medical information obtained in the past. Informed consent for participation in the research was provided in an opt-out format that guarantees research subjects the opportunity to refuse.