
Ian Paddick
EDUCATION
MSc in Radiation Physics, University College London
​
EXPERIENCE
Ian began his career as a Medical Physicist in 1989, working at the Hammersmith Hospital, London. Since 1998 he has worked almost exclusively with the Gamma Knife, being responsible for over 5,000 patient treatments using the B, 4C, Perfexion and Icon Gamma Knife models. He is a regular speaker and moderator at radiosurgery conferences, teaching on training courses and has helped start-up over 150 Gamma Knife centres worldwide. He is considered a world authority on treatment plan metrics, having formulated the Paddick Conformity Index and the Gradient Index. More recent research has been in the field of radiobiology as applied to radiosurgery.
​
Ian has an academic post at University College London and has published over 50 peer reviewed articles in the last 10 years.
​
In 2003, Ian formed Medical Physics Limited; a group of physicists providing expert radiosurgery physics services to SRS centres in the UK, Europe and the USA, as well as the manufacturers of the Gamma Knife, Elekta Instruments.
​
Ian is currently on the faculty of five Gamma Knife centres: Queen Square, London; Cromwell Hospital, London; London Gamma Knife Centre; Thornbury Radiosurgery Centre, Sheffield, and St. Elisabeth Hospital, Tilburg, Netherlands.
​
He was the first physicist to be elected as President of the International Stereotactic Radiosurgery Society (ISRS). He currently serves as Co-Chair of the ISRS Certification Committee and Past-President of the British Radiosurgery Society.
​

KEY COMPETENCIES:
Gamma Knife,
Commissioning & End-to-End testing, Elekta Versa HD & Infinity, Varian TrueBeam, Elekta Monaco, Brainlab Elements, Varian Eclipse and Raystation TPS.
Diana Grishchuk MSc
EDUCATION
MSc in Applied Nuclear Physics, Saint-Petersburg State Polytechnic University, St. Petersburg, Russian Federation
EXPERIENCE
Diana obtained her first clinical experience as a medical physicist at the Russian Research Center for Radiology and Surgical Technologies; the lead radiotherapy centre in Saint-Petersburg. She was involved in a major department transition from 2D to 3D techniques, commissioning of Elekta Axesse and Precise linacs, Precise Plan, XiO, ERGO++ and Monaco planning systems and the implementation of IMRT and IGRT into clinical practice.
Later in her career she successfully applied her experience to acceptance testing and commissioning of Elekta Versa HD linacs and Monaco TPS at the Maltese Radiotherapy centre and then Varian TrueBeam STx linac, Raystation and Brainlab Elements TPSs at Imperial College Healthcare Trust, London.
Her extensive clinical experience also includes, but is not limited to, the clinical implementation of IBA and PTW dosimetry equipment and the development of department QA programs, while leading IGRT and SRS clinical teams. She has HCPC registration as a Clinical Scientist in the UK and, working for Medical Physics Limited, currently provides Radiosurgery physics services to four Gamma Knife centres in the UK.
​
In addition to clinical work, she has also worked as a contractor for Elekta as a Linac Hardware and Clinical Go-live Application specialist in Europe, Middle East and Africa.
​

KEY COMPETENCIES:
Treatment planning, Quality Assurance
Ana Luis, MSc
EDUCATION
Postgraduate in Medical Physics and Radiation, BSc in Physics and Biomedical Engineering, University of Lisbon, Portugal.
EXPERIENCE
Ana worked as Medical Physicist in several Radiotherapy departments in Portugal, UK, and Netherlands, and work with Gamma Knife since 2007 in Lisbon and London. She developed her expertise in treatment planning (Eclipse, Raystation and Gamma Plan), commissioning/equipment QA (Varian, Elekta and Accuray), clinical implementation of advanced treatment techniques and patient specific quality control procedures.
Ana has taken the lead in performing and implementing several clinical and physics projects over the years, such as: acceptance and commissioning of Gamma Knife equipment, model Perfexion and ICON, clinical implementation of a stereotactic treatment planning technique for multiple brain metastases with Linac, using a single isocentre VMAT, PDD measurements and validation for an Orthovoltage machine; clinical implementation of ArcCheck for patient specific QA with Tomotherapy and commissioning of a new water tank for Tomotherapy beam data measurements.
Ana has HCPC registration as a Clinical Scientist in the UK since 2015 and Medical Physics Expert certificate in Portugal.
KEY COMPETENCIES
Gamma Knife, Treatment Planning Eclipse, Raystation and Gamma Plan, Quality Assurance Elekta, Varian
​
.jpeg)
KEY COMPETENCIES:
Treatment Planning, Radiobiology, IR(ME)R, Brachytherapy, Quality Management
Hannah Bouas, MSc
EDUCATION
MSc in Medical Physics, King’s College London
EXPERIENCE
Hannah gained her first class honours degree in Leeds before acquiring a distinction in her MSc in Clinical Healthcare Science in Newcastle. Gaining a wide range of Medical Physics skills at Leeds Teaching Hospitals and Lincoln Oncology Centre, Hannah joined the Medical Physics Limited team in December 2023. She currently works as Senior Radiosurgery Physicist at Thornbury Radiosurgery Centre, Sheffield. She is the newest member of the Medical Physicist Limited team
​

KEY COMPETENCIES:
Gamma Knife, Intracranial Radiosurgery, commissioning, IORT
Phil Tapper MSc MIPEM
EDUCATION
MSc in Radiation Physics, Medical College of St Bartholomew’s Hospital
EXPERIENCE
Phil worked for a number of years in the NHS before moving into the private sector, eventually becoming Head of the Medical Physics Department including the London Gamma Knife Centre at the Harley Street Cancer Centre. He has extensive experience in the commissioning of treatment facilities and of running a successful, high quality medical physics department.
​
Since 2008 he has been providing radiosurgical physics support as a consultant, working for Medical Physics Limited, to three Gamma Knife centres in the UK and more recently providing a managed IORT service to two hospitals.

