OCR A Level Physics A
OCR A Level Physics A Medical Imaging Exam Questions
Free OCR A Level Physics A exam questions on Medical Imaging, with mark schemes. Covers X-rays, CAT scans, PET scans, gamma cameras and ultrasound.
Medical Imaging exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
OCR A Level Physics A H556 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Physics A Medical Imaging
This topic applies physics to medical imaging.
What you need to know
- X-rays Production, attenuation and contrast media.
- CAT scans 3D images from rotating X-ray beams.
- Nuclear medicine Tracers, gamma cameras and PET scans.
- Ultrasound Acoustic impedance, A and B scans and Doppler.
Common mistakes in Medical Imaging
- Forgetting coupling gel.
- Mixing up attenuation mechanisms.
- Confusing PET and gamma camera.
Try three Medical Imaging exam-style questions
1. State why barium is used as a contrast medium. (1 mark)
Show the mark scheme answer
It has a high atomic number so absorbs X-rays strongly.
2. Explain the role of a collimator in a gamma camera. (1 mark)
Show the mark scheme answer
Allows only gamma rays travelling parallel to reach the detector.
3. State the formula for acoustic impedance. (1 mark)
Show the mark scheme answer
Z = ρc.
Medical Imaging FAQs
What does Medical Imaging cover?
X-rays, CAT, PET, gamma cameras and ultrasound.
Which imaging avoids ionising radiation?
Ultrasound.
What is technetium-99m used for?
As a gamma-emitting medical tracer.
Revise this topic with flashcards: OCR A Level Physics A H556 Flashcards, with mark scheme answers for Anki and Quizlet.
