Dr Choo is a Radiation Oncologist with more than 20 years of experience in caring for patients with cancer. Dr Choo Bok Ai accepts referrals for all cancer types, and his practice includes radiation therapy technologies, precision medicine and the treatment of breast, gynaecological, head and neck, prostate, skin and sarcoma cancers. Dr Choo is skilled in the use of IMRT, IGRT, VMAT, RapidArc, SBRT and SRS in treating cancers. He helped set up MRI-based cervical interstitial and intracavity brachytherapy during his tenure at National University Hospital from 2009-2018, and has taught at various postgraduate teaching courses within the region. He was also the Chairman of the Chapter of Radiation Oncology in Academy of Medicine Singapore from 2019–2023.