Swansea Bay University Health Board, Singleton Hospital, Sketty Lane, Swansea, SA2 8QA, UK

Received 18 July 2023 Accepted 18 August 2023.

Correspondence to Andy G Irwin, MSc, Department of Medical Physics and Clinical Engineering, Singleton Hospital, Sketty Lane, Sketty, SA2 8QA Swansea, UK. Tel: +44 1792 285294; e-mail: [email protected]