Ultrasound physics
Higher frequency improves resolution and reduces penetration, and this trade-off answers most imaging questions. Learn how transducer choice follows from the depth you need to reach.
Our blueprint estimate puts 5–10 of the 200 questions in biophysics, about 3.8% of the paper, spread across both papers. It is our estimate, not a figure published by the RCOG. A smaller share of the paper, but still examined every sitting.
5–10
of 200
5
in our syllabus map
measurement_manipulation
3 other areas
Biophysics is a small area with few questions per topic, and it is rarely the deciding area for a candidate. The questions are conceptual rather than numerical: why does this machine behave this way, and what does that mean for the patient?
The 5 syllabus topics we map to Biophysics for Part 1.
Higher frequency improves resolution and reduces penetration, and this trade-off answers most imaging questions. Learn how transducer choice follows from the depth you need to reach.
The angle of insonation matters: a beam perpendicular to flow detects nothing. Indices that are ratios, such as the pulsatility and resistance indices, are independent of angle, which is why they are used in fetal surveillance.
Radiation questions are really about trading maternal dose against fetal dose between investigations. MRI avoids ionising radiation, and the contrast agent rather than the magnetic field is the concern.
Monopolar and bipolar energy behave differently, and some injuries present late because of capacitive coupling or insulation failure rather than a sharp injury at the time of surgery.
Biophysics and Imaging for MRCOG Part 1 Preventing Entry-Related Gynaecological Laparoscopic Injuries
Aim for understanding in one or two sessions. Write down the three or four rules that govern ultrasound, Doppler and radiation, and for each one a clinical example from obstetrics. Revise electrosurgery with the laparoscopic entry summary, since the two come up together. Do not memorise dose figures; the questions test reasoning.
Part 1 is 200 single best answer questions across two papers with no negative marking, so an informed guess always beats a blank. Biophysics is low yield in our blueprint estimate, but it is also among the quickest to learn. A short, focused pass is more sensible than a deep one.
Every question is original and written from published RCOG and NICE guidance, and every explanation cites the guideline it came from. Free: 5 days full access, then 50 questions. No card.
Published RCOG and NICE guidance summarised for revision, with the source cited on every page.
MRCOG AI is an independent educational tool. It is not affiliated with, endorsed by, or connected to the Royal College of Obstetricians and Gynaecologists (RCOG).