Lesson 6.5.2
6.5.2 Diagnostic methods in medicine Quiz: OCR Physics, Unit 5
20 questions
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Lesson 6.5.2, Diagnostic methods in medicine: 20 multiple choice questions for the OCR Physics (H156), Unit 5: Particles and medical physics, written with Revision Ninja.
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The 20 questions
-
Which component of a gamma camera ensures gamma photons travel parallel to the axis?
- Computer display
- Photomultiplier tube
- Scintillator
- Collimator
-
Which component converts a gamma photon into many visible light photons?
- Collimator
- Coupling gel
- Photomultiplier tube
- Scintillator
-
What particle annihilates with a positron during a PET scan to produce gamma rays?
- Proton
- Electron
- Neutrino
- Neutron
-
At what angle to each other are gamma photons emitted during positron-electron annihilation?
- 90 degrees
- 45 degrees
- 360 degrees
- 180 degrees
-
Which type of radiation is emitted by the medical tracer technetium-99m?
- Gamma radiation
- Beta radiation
- Alpha radiation
- Neutron radiation
-
What shape of X-ray beam is used in a computerised axial tomography scanner?
- Pencil-shaped
- Conical
- Fan-shaped
- Spherical
-
What is a key advantage of a CAT scan compared to a simple X-ray?
- Lower radiation dose
- 3D image
- Cheaper equipment
- Faster scan time
-
What is the minimum frequency for a sound wave to be classified as ultrasound?
- 2 MHz
- 20 kHz
- 200 Hz
- 20 Hz
-
Which effect causes a piezoelectric crystal to generate a voltage when compressed?
- Doppler effect
- Photoelectric effect
- Piezoelectric effect
- Compton effect
-
What two quantities are multiplied together to calculate acoustic impedance?
- Density and speed
- Pressure and area
- Density and frequency
- Mass and velocity
-
What is the SI unit for acoustic impedance?
- kg m^-2 s^-1
- J m^-2
- kg m^-3
- N m^-2 s
-
What is the main purpose of applying acoustic coupling gel before an ultrasound scan?
- Absorbing radiation
- Impedance matching
- Reducing friction
- Cooling skin
-
What type of ultrasound display shows the amplitude of reflected waves against time?
- A-scan
- CAT scan
- PET scan
- B-scan
-
How is reflected wave intensity represented in a two-dimensional ultrasound B-scan?
- Height of peaks
- Colour of line
- Brightness of dots
- Sound pitch
-
In the ultrasound Doppler equation, what does the angle theta represent?
- Beam to skin
- Skin to transducer
- Wave to detector
- Beam to flow
-
Which medical imaging technique commonly uses fluorine-18 attached to glucose molecules?
- Ultrasound scanning
- Gamma camera
- CAT scanning
- PET scanning
-
What is converted into an electrical signal by photomultiplier tubes in a gamma camera?
- X-rays
- Positrons
- Gamma photons
- Light photons
-
When does maximum reflection occur at a boundary between two tissue layers?
- Zero wave frequency
- Small density ratio
- Large impedance mismatch
- Equal acoustic impedance
-
What happens to the reflected ultrasound frequency when blood flows towards the transducer?
- Frequency increases
- Frequency remains constant
- Frequency decreases
- Frequency drops zero
-
What form of energy is released when electron-positron annihilation occurs in PET scanning?
- One alpha particle
- Two beta particles
- Two gamma photons
- One X-ray photon
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