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Article History

Received: 7 March 2023

Revised: 26 March 2023

Accepted: 30 March 2023

First Online: 16 June 2023

Declarations

:

: The scientific guarantor of this publication is Suk Hyun Lee.

: The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.

: No complex statistical methods were necessary for this paper.

: Written informed consent was waived by the Institutional Review Board.

: Institutional Review Board approval was obtained.

: Some study subjects have been previously reported in our previous article (<i>Eur Radiol</i> (2021) 31:4606–4614). This study included 135 patients who underwent PET/CT scans in both supine and prone positions from October 2018 to September 2021 at Kangnam Sacred Heart Hospital. Our previously published study included 28 patients who underwent PET/CT scans in both supine and prone positions from November 2018 to April 2020. Therefore, a significant number of patients overlap. However, the previous study was to find out whether prone position PET/CT could reduce the respiratory motion artefact of the lung nodule, and the current study was to find out if it could reduce the gravity-dependent opacity-related [¹⁸F]FDG uptake of the normal lung. Therefore, the two studies have completely different study designs.

: • retrospective• observational• performed at one institution