Biophysics is often one of the least familiar subjects for MRCOG Part 1 candidates, yet it offers some of the most straightforward marks in the exam once the core principles are understood. Our free MRCOG Part 1 biophysics revision notes explain the physics behind the technology used every day in obstetrics and gynaecology, in clear and practical terms.

Mapped to the MRCOG Part 1 syllabus, the notes cover the principles of ultrasound and Doppler, ultrasound safety including thermal and mechanical indices, X-rays, CT and MRI, ionising radiation and its effects in pregnancy, diathermy and electrosurgery, and lasers. Each topic is linked to the clinical questions that commonly appear in single best answer (SBA) questions, such as choosing safe imaging in pregnancy, avoiding diathermy injuries and understanding how fetal Doppler measurements are obtained.

Whether biophysics is a weak spot or you simply want to secure easy marks before the exam, these notes make the subject accessible and exam-focused. They're free to access and designed to work alongside your question practice.