Which type of electromagnetic wave is used in X-ray imaging?
a) Radio waves
b) Microwaves
c) X-rays
d) Infrared waves
Which imaging technique uses strong magnetic fields and radio waves?
a) X-ray
b) MRI
c) CT scan
d) Ultrasound
Which property of X-rays allows them to penetrate tissues?
a) High frequency
b) Low energy
c) Long wavelength
d) High amplitude
Which type of medical imaging does NOT use ionizing radiation?
a) X-ray
b) MRI
c) CT scan
d) PET scan
Which of the following is a key principle of ultrasound imaging?
a) Refraction
b) Reflection of sound waves
c) Diffusion
d) Electromagnetic induction
What is the function of contrast agents in medical imaging?
a) Increase image sharpness
b) Reduce radiation exposure
c) Enhance visibility of internal structures
d) Absorb excess radiation
Which imaging method provides a real-time moving image?
a) X-ray
b) MRI
c) Fluoroscopy
d) CT scan
Which part of the body absorbs the most X-rays, appearing white on an X-ray image?
a) Muscle
b) Bone
c) Fat
d) Blood
Which imaging technique uses gamma rays?
a) MRI
b) PET scan
c) Ultrasound
d) CT scan
What is the main advantage of using CT scans over traditional X-rays?
a) Lower radiation exposure
b) Higher resolution and 3D imaging
c) Uses sound waves instead of radiation
d) Faster imaging process
Which of the following imaging techniques is best for soft tissue contrast?
a) X-ray
b) MRI
c) CT scan
d) Fluoroscopy
Which principle allows MRI scanners to generate images?
a) Nuclear magnetic resonance
b) Photoelectric effect
c) Doppler effect
d) Compton scattering
Which medical imaging method is best for detecting metabolic activity in tissues?
a) CT scan
b) MRI
c) PET scan
d) X-ray
Which type of waves are used in ultrasound imaging?
a) Radio waves
b) Sound waves
c) Gamma rays
d) Microwaves
Which physical principle explains why ultrasound waves reflect at tissue boundaries?
a) Diffusion
b) Reflection and refraction
c) Electromagnetic induction
d) Quantum tunneling
What is the purpose of a collimator in an X-ray machine?
a) To absorb excess radiation
b) To focus X-rays into a narrow beam
c) To detect gamma rays
d) To generate electrical signals
What does the term “Doppler” in Doppler ultrasound refer to?
a) Change in frequency due to motion
b) Intensity of sound waves
c) Reflection of X-rays
d) Magnetic field strength
What is the primary disadvantage of using CT scans?
a) Slow image acquisition
b) High radiation exposure
c) Poor resolution
d) Limited availability
Which imaging technique is commonly used for brain scans?
a) MRI
b) Ultrasound
c) Fluoroscopy
d) X-ray
Which effect is responsible for X-ray absorption in tissues?
a) Compton scattering
b) Nuclear decay
c) Doppler effect
d) Snell’s law
Which of the following materials is most commonly used for X-ray shielding?
a) Aluminum
b) Copper
c) Lead
d) Plastic
Which factor determines the resolution of an MRI scan?
a) Magnetic field strength
b) X-ray intensity
c) Sound wave frequency
d) Radiation dose
Which type of radiation is used in nuclear medicine imaging?
a) Alpha particles
b) Beta particles
c) Gamma rays
d) Infrared waves
What is the purpose of a scintillation detector in medical imaging?
a) Generate sound waves
b) Convert radiation into visible light
c) Absorb X-rays
d) Reduce radiation dose
Which of the following imaging techniques requires the use of a radiotracer?
a) MRI
b) PET scan
c) Ultrasound
d) CT scan
What determines the penetration depth of ultrasound waves?
a) Frequency of the sound wave
b) Speed of light
c) X-ray intensity
d) Magnetic field strength
Which phenomenon allows MRI machines to create detailed images?
a) Proton alignment in a magnetic field
b) Refraction of sound waves
c) Scattering of X-rays
d) Gamma ray emission
Which factor affects the contrast in an X-ray image?
a) Atomic number of tissues
b) Magnetic field strength
c) Sound wave frequency
d) Doppler shift
What is the role of a photomultiplier tube in medical imaging?
a) Amplify weak light signals
b) Absorb X-ray photons
c) Generate ultrasound waves
d) Produce magnetic fields
Which component is essential in an MRI machine to generate the magnetic field?
a) Superconducting magnet
b) X-ray tube
c) Photomultiplier tube
d) Piezoelectric crystal
