Dr Antonio Pais

Dr Antonio Pais  joined CitiScan Radiology in 2015, bringing with him extensive experience as a radiologist and educator. Dr Pais was the Director of Radiology Services for the Mackay Hospital and Health Services for ten years before relocating to Brisbane. Prior to this he was the Director of Training and a Senior Lecturer at James Cook University.

Dr Pais graduated from St Johns Medical College in Bangalore, India. Following this he completed his post graduate training in Radiology at Christian Medical College, Vellor, India. He then managed his own diagnostic radiology centre in the state of Goa for 15 years.


DR chris yu

Dr Chris Yu is a dual qualified radiologist as an accredited consultant for both Nuclear Medicine and Radiology. Currently Dr Yu is a staff specialist at the Princess Alexander Hospital. Following graduation from Sydney University, Dr Yu completed his Radiology training and fellowship at the Royal North Shore Hospital in Sydney.  

Dr Yu's main interest is in Nuclear Medicine, cross sectional CT and MRI imaging, particularly in Musculoskeletal and Oncology imaging. He is actively involved in registrar training and medical student teaching.



Dr Van der Wall is Professor of Medicine at Notre Dame University in Sydney. He trained at the Prince of Wales Adult and Children's Hospital. On completion of his PhD at the University of NSW he took up the position of Director of Nuclear Medicine at Concord Hospital and is now full-time in private practice with 30 years experience as a Nuclear Medicine Specialist.

Dr Van der Wall has supervised 9 PhD students and published over 150 scientific papers in the refereed literature. He has co-authored chapters in 8 textbooks of Nuclear Medicine and is a section editor of the musculoskeletal section in the current reference text of Nuclear Medicine (Ell & Gambhir). Dr Van der Wall has been the invited speaker at over 70 international and local meetings including the Society of Nuclear Medicine annual meetings held in the US and Europe, World Congress on Low Back Pain and the European
Thoracic Society Meeting.

Main research interests are in gastroesophageal reflux testing and the diagnosis of lateralising lower back pain. He has developed and patented tests in both areas and his research has been validated against the accepted reference standards.


Dr Alison Butt was born and raised in Adelaide, and obtained her Bachelor of Dental Surgery at the University of Adelaide. She worked in general dental practice for 15 years before completing specialist training in maxillofacial radiology in 2010. Dr Butt also works as part of the multidisciplinary specialist dental team for Queensland Health. Her special interests include education and continuing professional development in dental radiology for the practicing clinician.