The effect of butylscopolamine on [¹⁸F]FDG uptake in the gastrointestinal tract is negligible and regionally variable.

"Declarations Ethics approval and consent to participateInternal ethics committee of Jena University Hospital confirmed scientific evaluation of routinely collected data with registration number 2021–2208-Daten. All patients gave full informed consent for clinically indicated PET/CT examination. The study was performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments. Consent for publicationNot applicable. Competing interestsThe authors declare that they have no competing interests. Competing interests The authors declare that they have no competing interests."

"Funding Open Access funding enabled and organized by Projekt DEAL. No external funding. All analyses were based on internal resources of the University Hospital Jena."