Exam1 US
Generale Questions in imaging with corrections
Q1 : what type of waves x-rays are :
a- Electromagnetic waves
b- Mechanical waves
c- Electronic pulsed waves
d- Nuclear waves
Q2: X-rays wavelength are in :
a- Pico-meters,
b- Angstroms
c- Micrometers
d- milimeters
Q3: Biological damage is the result of which of the following effects.
a- scintillation effect,
b- photoelectric effect
c- ionization effect
d- electromagnetic effect
Q4-Absorbed dose of x-ray is
a- cumulative
b- noncumulative
c- Superlative
d- conductive
Q5- At what level the surface dose is measured?
a- Table level
b- Tube level
c- Bone level
d- Skin level
Q6- The percentage of x-ray produced at the Anode is :
a- 1 %,
b- 5%,
c- 10%
d- non of them.
Q7-large filament in dual focus cup cathode is used for
a- dense anatomy
b- thin anatomy
c- liquid
d- solid
Q8- Which type of generator is used since 1990?
a- Single phase
b- Six pulse
c- High frequency
d- 12 pulse
Q9: Batter powered model is used in mobile system, from what material the battery is formed:
a- Sodium
b- Potassium
c- Lead-acid
d- Nickel Cadmium
Q10- What is the role of tube housing?
a- Protect the tube
b- Reduce the heat
c- Cooling the tube
d- Increase x-ray rate
Q11 : Shimming coil in MRI imaging play the role of:
a- Amplifying magnetic field
b- Non homogeneity compensation of magnetic field
c- Generate RF signal
d- Stabilize the current
Q12: which type of particle is used for MRI imaging
a- Electron
b- Positron
c- Proton
d- Neutron
Q13 : Larmor frequency used in MRI is proportional to :
a- Radio frequency
b- Electromagnetic field
c- Wavelength
d- Signal frequency
Q14 : in which order the MRI system is organized :
a- Main magnet, shimming coil, gradient coil , RF coil
b- Main magnet, gradient coil, shimming coil, RF coil
c- Main magnet, shimming coil, RF coil, gradient coil
d- Gradient coil, shimming coil, main magnet, RF coil
Q15: for what PET used for:
a- Heart sound measurement
b- Blood pressure
c- Nuclear imaging
d- Pulse electronic transmission
Q16: what is a gamma camera?
a- Detect gamma rays light emission
b- Send electrons to patient
c- Image the abdomen and muscle
d- Provide a global picture of the body
Q17:collimator in gamma camera is used to:
a- Select gamma rays along particular direction
b- suppress scatter
c- preserve edges
d- smooth details
Q18: role of photomultiplier tube
a- transform light to electron and amplify current
b- multiply photon by electron
c- multiply electron with voltage
d- amplify photons
Q19: what is SPECT?
a- ultrasonic device
b- nuclear imaging device
c- MRI device
d- CT device
Q20: SPECT uses :
a- X-ray tube
b- Anger camera
c- Localizer
d- Bode plot
Q21: Where is the Backprojection method is used
a- Computed tomography imaging
b- PET imaging
c- SPECT imaging
d- Ultrasound Doppler imaging
Q22: PET uses
a- Electron proton annihilation
b- Coincidence counting circuit
c- Electronics demonstrator
d- Gamma decay
Q23 : what is an histogram?
a- brightness of the image
b- gray level in an image
c- intensity of the image
d- density of gray levels values in an image
Q24: CT imaging uses
a- x-ray waves
b- sound waves
c- backprojection method
d- film
Q25: in CT imaging tube and detector are:
a- perpendicular to each other
b- 180 degree coupled
c- 270 degree coupled
d- 120 degree coupled
Q26 : Doppler principle is used for :
a- Static object
b- Moving object
c- Liquid
d- solid
Q27 : Doppler imaging is used for:
a- air flow
b- blood quantity
c- blood flow and direction
d- temperature
Q28 : Scout- Axial Helical and cine are;
a- scan mode in CT
b- scan mode in PET
c- scan modes in MRI
d- Scan modes in US.
Q29 : Detector in CT are :
a- Analog
b- Digital
c- Graphite
d- Titanium
Q30: Detector cell is formed of
a- Diode crystal
b- Detector channel
c- Detector module
d- plutonium