Funding for this research was provided by:
Japan Society for the Promotion of Science (JP17H04266, JP20K08056)
Japan Society for the Promotion of Science (JP17K16482)
Uehara Memorial Foundation
Canon Medical Systems
Received: 18 December 2021
Accepted: 31 March 2022
First Online: 15 April 2022
: This prospective study was approved by the institutional review board of Keio University School of Medicine, and written consent was obtained from all the participants (study protocol: #20160384).
: Not applicable.
: Masahiro Jinzaki received a grant from Canon Medical Systems, which loaned the upright CT device to Keio University. The funder was not involved in the design of the study; the collection, analysis, or interpretation of the data; or the writing of the manuscript. The other authors declare that they have no conflicts of interest.