People
Members of the City St George's Research Radiographer Group (CRRAG).
You can find out more about each member of staff, including their latest publications and their contact details by following the links below.
Leads
Dr Christina Malamateniou – CRRAG Director
Lead for MRI, AI, mixed-methods
Dr Christina Malamateniou is a diagnostic radiographer with more than 20 years research expertise in AI, MRI, and person-centred care. She has previously worked at Imperial College, University of Liverpool, King's College London and holds different leadership positions at the Society and College of Radiographers, EFRS, EuSoMII and British Institute of Radiology. She has also a keen interest in clinical education, research mentoring and research capacity building for healthcare practitioners. She supervises PhD students in the above research fields.
Her current research involves AI implementation in medical imaging and oncology in collaboration with multidisciplinary teams in the UK and internationally, cardiovascular MRI with Oxford University, autism friendly MRI with City St George’s Psychology and Anna Freud Centred at UCL, and perinatal MRI with King’s College London. She has received more than 3.25mi in research funding as a PI and Co-I, has published extensively and has delivered more than 100 keynote lectures in all key medical imaging conferences worldwide.
Dr Emily Skelton – CRRAG Deputy Director
Lead for ultrasound, person-centred care, qualitative
Dr Emily Skelton is a Diagnostic Radiographer specialising in Medical Ultrasound. Her research explored parents' experiences of antenatal imaging and their effect on the developing parent-fetal bond.
Her professional and research interests include clinical education and training, advancing imaging technologies, parent-centred care, and strengthening patient, public and practitioner partnerships to improve healthcare experiences for everyone.
Members
Mr Liam Mannion
Lead for radiotherapy, research governance and ethics
Liam Mannion is a senior lecturer for the BSc (Hons)Therapeutic Radiography and Oncology course at City St . George's, University of London. He leads a variety of modules including those based around radiotherapy techniques, principles of oncology, and radiobiology. He has previously worked as a therapeutic radiographer for the NHS and in the private sector.
Dr Mark Ngo
Lead for workforce development
Dr Mark Ngo is a Lecturer in Diagnostic Radiography in the Department of Midwifery & Radiography, and HCPC-registered diagnostic radiographer.
His current research focuses on workforce retention and development, reducing occupational burnout and work-related musculoskeletal injuries among radiographers, supporting students during clinical placements, and exploring the role of clinical debriefing to support the emotional wellbeing of radiographers and students.
Dr Benard Ohene Botwe
Lead for CT, quantitative
Dr Benard Ohene-Botwe is a Senior Lecturer in Diagnostic Radiography in the Department of Midwifery & Radiography.
He conducts research in radiography/medical imaging, radiology and public health and has over 70 publications, of which many are in Scopus-based journals. His current research interests focus on Patient and Staff safety, particularly concerning Computed Tomography studies, including Indication-Based Diagnostic Reference Levels, Acceptable Quality Dose (AQD), and Radiation Protection and Optimization.
Other areas of his research include Artificial Intelligence, Cancer diagnosis, and workforce development and retention to help achieve Sustainable Development Goal 3. His recent research also includes sustainability issues.
Mr Chris O’Sullivan
Lead for education and leadership
Chris O'Sullivan is a HCPC-registered therapeutic radiographer, senior lecturer and Co-Head of the Department of Midwifery & Radiography. He is a Senior Fellow of the Higher Education Academy.
Chris works with cancer charities in the United Kingdom in peer-reviewing and updating their patient information resources related to radiotherapy. He has a special interest in the holistic care of prostate cancer patients.
Dr Stamatia Papathanasiou
Lead for mammography and breast imaging
Dr Stamatia Papathanasiou is a Lecturer in Diagnostic Radiography in the Department of Midwifery & Radiography. She is an active member of the BISIG (Breast Imaging Special Interest Group) in UK.
She conducts research in medical imaging, breast imaging and mammography. Her current research focuses on viewing conditions and technical characteristics on breast cancer detection, quality assurance and quality control procedures and protocols in general radiography and mammography, AI and exploring the role of clinical debriefing.
Senior Associate Members
Professor Susan Shelmerdine
Prof Susan Shelmerdine is a consultant paediatric radiologist at Great Ormond Street Hospital for Children and Associate Professor at UCL, where she holds an NIHR Advanced Fellowship. She founded and chaired the European Society of Paediatric Radiology AI Taskforce (2020–2025), sits on the Royal College of Radiologists AI Advisory Group, and has recently launched an AI Youth Council seeking to involve youth voices in how AI is used in healthcare. Her research interests include AI in children’s imaging healthcare; and systems thinking in healthcare AI adoption.
She has published over 167 peer-reviewed papers including work in The Lancet, NEJM AI and BMJ, has been interviewed on BBC News, Times Radio and LBC, and the recipient of several awards including the RCR Roentgen Professorship (2025), AI100 UK, DHSC AI Visionary Award, and RCR Exceptional Contribution Award.
As a Honorary Visiting Professor at City St George's, she advises doctoral researchers on AI implementation and human-AI collaboration, is a member of the CRRAG research group and faculty on the AI for Imaging short course.
PhD Students
Julien Greggio
PhD candidate
Jack Packer
PhD candidate
Ben Potts
PhD candidate
Ben Potts is a diagnostic radiographer at University Hospital Southampton NHS Foundation Trust and a part-time doctoral researcher at City St George’s, University of London.
Ben’s PhD explores the experiences of neurodivergent individuals, specifically autistic and ADHD adults, in emergency departments. It uses participatory research methods and is co-produced with neurodivergent individuals, ensuring their voices remain at the centre of the project.
As a neurodivergent individual himself (autistic, ADHD, and dyslexic), he brings a dual perspective to his research, drawing on both professional expertise and lived experience.
Nikos Stogiannos
PhD candidate
Gemma Walsh
PhD candidate
Gemma Walsh is an MRI specialist Diagnostic Radiographer working within the NHS.
Gemma's research involves exploring potential Artificial Intelligence (AI) leadership roles for Radiographers to aid safe and effective AI implementation across healthcare. She has been awarded a full studentship from the South and East Network of Social Sciences (SeNSS) to fund and support this work. Her professional and research interests include radiographer workforce development, AI in medical imaging and patient centred care. Gemma also advocates the need for clinical academics across the allied health professions (AHPs).