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B.Sc. Medical Imaging Technology — II Year Question Paper Scope (Radiation Physics, Imaging Physics & Dark Room Techniqu: 16 MCQs with answers

All 16 multiple-choice questions from this kit, free and with no sign-up.

Full kit · everything Flashcards · 30 Quick Revision · 50

Warm-up · 5 questions

Q1. A radiographer notices the image has poor contrast due to scatter. Which device is designed primarily to absorb scattered radiation before it reaches the detector?

Beginner
A A collimator
B A grid
C A survey meter
D A filter
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B · A grid

A grid is a plate of alternating lead strips and radiolucent spacers that absorbs off-axis scattered radiation, improving contrast.

Q2. Which statement best describes the photoelectric effect in radiography?

Beginner
A An X-ray photon passes through without interaction.
B An X-ray photon produces a pair of positive and negative electrons.
C An X-ray photon scatters and loses part of its energy.
D An X-ray photon ejects an inner-shell electron and is completely absorbed.
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D · An X-ray photon ejects an inner-shell electron and is completely absorbed.

In the photoelectric effect the photon is completely absorbed and an inner-shell electron is ejected, producing high subject contrast.

Q3. What does ALARP stand for in radiation protection?

Beginner
A Applied Limit And Radiation Protection
B Average Level of Absorbed Radiation Practice
C As Low As Radiation Permits
D As Low As Reasonably Practicable
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D · As Low As Reasonably Practicable

ALARP is the principle of keeping doses As Low As Reasonably Practicable.

Q4. Which view is specifically used to demonstrate the patellofemoral joint?

Beginner
A Ankle mortise view
B Babygram
C Jug handle projection
D Skyline view
Show the answer

D · Skyline view

The skyline (tangential) view shows the patellofemoral joint space.

Q5. ALARP stands for As Low As Reasonably Practicable, a principle of radiation dose optimisation.

Beginner
A True
B False
Show the answer

A · True

ALARP stands for As Low As Reasonably Practicable, a principle of radiation dose optimisation.

Building up · 6 questions

Q6. A student says a filter increases patient dose because it removes photons. What is the correct explanation?

Intermediate
A Filters increase dose but improve contrast dramatically.
B Filters increase dose because they absorb useful photons.
C Filters remove low-energy photons that would only add dose, so overall dose is reduced.
D Filters have no effect on dose or image quality.
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C · Filters remove low-energy photons that would only add dose, so overall dose is reduced.

Filters preferentially remove low-energy photons that contribute dose but not diagnostic information, so patient dose is reduced.

Q7. During a procedure the grid is tilted relative to the beam. What is the most likely result?

Intermediate
A No effect because grids are insensitive to tilt.
B Improved contrast because scatter is better absorbed.
C Grid cut-off, causing loss of density across the image.
D Increased scatter reaching the detector.
Show the answer

C · Grid cut-off, causing loss of density across the image.

Tilting the grid causes grid cut-off: primary beam is absorbed by the lead strips, reducing density.

Q8. Which generator type produces a nearly constant potential across the X-ray tube?

Intermediate
A Battery-powered generator
B Single-phase generator
C Self-rectified generator
D High-frequency generator
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D · High-frequency generator

High-frequency generators convert to high-frequency AC and rectify, giving nearly constant potential and better beam quality.

Q9. A grid-controlled X-ray tube is most useful for which application?

Intermediate
A Portable radiography with limited power
B Continuous long exposures for thick body parts
C Mammography requiring very low dose
D Pulsed fluoroscopy requiring rapid switching of the beam
Show the answer

D · Pulsed fluoroscopy requiring rapid switching of the beam

The third electrode (grid) allows rapid on/off switching of the electron beam, ideal for pulsed fluoroscopy.

Q10. Which factor does NOT directly affect geometric unsharpness?

Intermediate
A Focal–film distance
B Focal spot size
C Patient motion during exposure
D Object–film distance
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C · Patient motion during exposure

Patient motion causes motion unsharpness, not geometric unsharpness. Geometric unsharpness depends on focal spot size, OFD and FFD.

Q11. Which projection is best for demonstrating the zygomatic arch?

Intermediate
A Jug handle projection
B Skyline view
C Ankle mortise view
D Frog leg view
Show the answer

A · Jug handle projection

The jug handle projection is designed to show the zygomatic arch.

Topper level · 5 questions

Q12. A radiographer needs to reduce scatter and patient dose during a paediatric chest X-ray. Which combination is most appropriate?

Advanced
A Use a grid and increase the field size to include the whole body.
B Use a collimator to restrict the field and a filter to remove low-energy photons.
C Use a survey meter to measure scatter and adjust exposure time.
D Remove the filter and use a larger focal spot.
Show the answer

B · Use a collimator to restrict the field and a filter to remove low-energy photons.

Collimation reduces field size and scatter; filtration removes low-energy photons, reducing dose without degrading the image.

Q13. Assertion (A): The photoelectric effect produces high subject contrast. Reason (R): It is dominant at high X-ray energies and low atomic number materials. Choose the correct option.

Advanced
A A is true, R is true and R explains A.
B A is true, R is false.
C A is false, R is false.
D A is false, R is true.
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B · A is true, R is false.

The photoelectric effect does give high subject contrast, but it dominates at low energies and high atomic number, so R is false.

Q14. A student compares a diode and a triode X-ray tube. Which statement correctly distinguishes them?

Advanced
A Both have identical electrode structures but different housings.
B A triode uses self-rectification; a diode uses high-frequency rectification.
C A diode has a grid; a triode does not.
D A triode has an extra grid electrode for control; a diode has only cathode and anode.
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D · A triode has an extra grid electrode for control; a diode has only cathode and anode.

A diode has two electrodes; a triode adds a grid for control of the electron beam.

Q15. Which sequence correctly describes the image chain from exposure to visible image?

Advanced
A Visible density → latent image formation → processing
B Sensitometry → latent image formation → processing
C Processing → latent image formation → visible density
D Latent image formation → processing → visible density
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D · Latent image formation → processing → visible density

Exposure creates the latent image; processing converts it into visible density.

Q16. A radiographer notices that a film appears less sharp than expected. Which factor is a likely cause of motion unsharpness?

Advanced
A Increased object–film distance
B Use of a small focal spot
C Patient movement during the exposure
D Use of a high-frequency generator
Show the answer

C · Patient movement during the exposure

Motion unsharpness is caused by patient or equipment movement during exposure.

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