Core Lab Team

The Clinical Trials Network and Core Lab are jointly administered by Professors Paul Marsden and Sally Barrington. Both have extensive experience in all aspects of PET, and in particular, the running of multicentre PET trials and were involved in the establishment of the original trials network at St Thomas'.

Day-to-day management of the Core Lab is overseen by Alyss Harman. Technical and clinical support is provided by a team of physicists and clinicians with expertise in conducting clinical trials from the King's College London & Guys and St Thomas' PET Centre.

UK PET Core Lab Co-leads

Professor Sally Barrington

Professor Sally Barrington

Professor of PET Imaging and NIHR Research Professor

Sally Barrington is Professor of PET Imaging and NIHR Research Professor in the School of Biomedical Engineering & Imaging Sciences at King's College London, St Thomas' Hospital. Her research interests include PET and lymphoma, standardisation of PET and organisation of multicentre trials and PET in Radiotherapy planning.

Research Profile


Professor Paul Marsden

Professor Paul Marsden

Professor of PET Physics

Paul Marsden is Professor of PET Physics in the School of Biomedical Engineering & Imaging Sciences at King's College London. He is also Director for PET Physics at the King's College London & Guys and St Thomas' PET Centre. Paul Marsden has been involved in PET imaging for most of his career and has worked in most aspects of the field. His research interests cover PET methodology and applications.

Research Profile


Research Coordinator

Maria Dibua

Maria Dibua

Clinical Trial Research Coordinator

Maria coordinates the PET aspects of clinical trials including applying for approvals, patient recruitment, data management and maintaining site files. She also assists with development of new trials involving imaging.


Physics Team

Alyss Harman

Alyss Harman

Medical Physicist

Alyss manages the running of the core lab and has developed automated processes for quality control of PET scans. She also acts as RPS for the clinical and research radiochemistry labs, ensuring regulatory compliance.


Dr Georgios Krokos

Dr Georgios Krokos

Clinical Scientist

Georgios has experience in pharmacokinetic analysis for measuring cerebral perfusion and permeability using dynamic PET and MR images. He also has an interest in PET image reconstruction techniques and he has been involved in standardisation of PET-MR scanners, participating in multicentre trials for the Dementias Platform UK.

Research Profile


Lewis Davies

Lewis Davies

Clinical Scientist

Lewis is involved in a number of multicentre trials utilising PET for radiotherapy planning, as well as being involved in industrial academic collaboration to implement new technologies into the clinic. He acts as RPS for the clinical scanning area, ensuring regulatory compliance.


 Sameer Jin

Sameer Jin

Medical Physics Technologist

Sameer manages the day-to-day activities of the core lab which involves site accreditation, ensuring that patient scans are acquired correctly, and communicating with the sites. He is also involved in radiation protection for the clinical scanning areas.


Clinical Support

Dr Victoria Warbey

Dr Victoria Warbey

Consultant Radiologist and Nuclear Medicine Physician

Vikki's research interests include functional imaging of lymphoma and the use of PET in neurofibromatosis.

Research Profile


Dr Manil Subesinghe

Dr Manil Subesinghe

Clinical Lecturer in PET imaging/Honorary Consultant Radiologist

Manil’s research interests involve the role of functional and molecular imaging in cancer, with specific interests in the use of PET in haematological and oesophagogastric malignancies.

Research Profile