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WorksheetsX-ray Production and Imaging Quiz
Total questions: 50
Worksheet time: 25mins
X-rays are produced when high-speed electrons strike the:
Cathode
Filament
Anode target
Grid
The process responsible for X-ray photon production is:
Thermionic emission
Bremsstrahlung and characteristic radiation
Photoelectric absorption
Scattering
The target material in an X-ray tube is usually made of:
Copper
Tungsten
Aluminum
Steel
The high melting point of tungsten is approximately:
1500°C
3400°C
4500°C
1000°C
The filament in an X-ray tube is made of:
Tungsten
Molybdenum
Nickel
Iron
Thermionic emission is the:
Emission of photons from the target
Boiling off of electrons from the filament
Acceleration of electrons
Deceleration of electrons
The focusing cup in the X-ray tube is made of:
Lead
Molybdenum
Nickel
Tungsten
The function of the focusing cup is to:
Focus the X-ray beam
Focus the electron stream
Increase beam intensity
Produce contrast
The energy of an X-ray photon is proportional to:
Wavelength
Frequency
Filament current
Exposure time
The quantity of X-rays produced depends on:
kVp
mA and exposure time
Filtration
Focal spot
The quality (penetrating power) of X-rays depends on:
mA
Exposure time
kVp
SID
The small focal spot size provides:
Sharper images
More exposure
Less detail
Increased patient dose
The line focus principle is used to:
Increase field size
Reduce effective focal spot size
Increase tube current
Reduce beam divergence
The anode heel effect causes:
Uniform beam intensity
Variation in beam intensity
Reduced heat
Increased exposure
Characteristic X-rays are produced when:
Electrons are deflected
Inner shell electrons are ejected
Filament is heated
X-rays pass through filters
The continuous X-ray spectrum is due to:
Bremsstrahlung radiation
Characteristic radiation
Scatter
Filtration
The anode rotates in most diagnostic tubes to:
Increase X-ray output
Spread heat over a larger area
Focus the beam
Decrease exposure time
The rotating anode is driven by:
Electric motor
Magnetic induction motor
Gear system
Cooling fan
The housing of the X-ray tube prevents:
Heat loss
Leakage radiation
X-ray production
Scatter radiation
The main component that filters low-energy X-rays is:
Collimator
Filter
Grid
Target
The filter material most commonly used is:
Copper
Aluminum
Lead
Barium
The added filtration in diagnostic tubes is usually:
0.1 mm Al
1.0 mm Al
2.5 mm Al
5.0 mm Al
Bremsstrahlung radiation literally means:
“Breaking radiation”
“Magnetic radiation”
“Continuous radiation”
“Rotating radiation”
Characteristic X-rays depend on:
Target material
Filament temperature
mA
Filtration
The part of X-ray tube where electrons originate is:
Anode
Cathode
Window
Envelope
The imaging plate in CR contains:
Silver halide
Photostimulable phosphor
Selenium
Iodine
The phosphor layer in CR is usually made of:
BaFBr:Eu²⁺
CsI
GdOS
AgBr
The laser used in CR reader is:
Helium-neon laser
Diode laser
Argon laser
CO₂ laser
The latent image in CR is formed by:
Ionization
X-ray absorption in phosphor
Light emission
Photochemical reaction
The stored energy in CR plate is released as:
Sound waves
Visible light
Electrons
Infrared
The light emitted from CR plate during reading is detected by:
Photodiode
Photomultiplier tube
Laser
CCD
The process of erasing a CR plate uses:
Laser light
White light
UV light
X-ray
The typical resolution of CR systems is around:
1 lp/mm
2–5 lp/mm
10 lp/mm
20 lp/mm
The advantage of CR over conventional film:
Immediate image preview
Higher spatial resolution
No radiation
Lower maintenance
CR imaging plates are enclosed in:
Light-proof cassette
Transparent cassette
Lead box
Vacuum chamber
DR uses:
Photostimulable phosphor plates
Flat-panel detectors
Photographic film
Wet chemical processing
The two main types of DR detectors are:
Direct and indirect conversion
Linear and circular
Active and passive
Thermal and optical
The direct conversion DR detector uses:
Cesium iodide
Amorphous selenium
Photomultiplier
CCD
The indirect conversion detector uses:
Scintillator and photodiode
Photocathode
Vacuum tube
Thermistor
The scintillator in indirect DR is made of:
Cesium iodide
Tungsten
Silver bromide
Lead oxide
TFT stands for:
Thin Film Transistor
Thick Film Transistor
Thin Focal Tube
Thermal Filter Technology
The role of the TFT array is to:
Store the X-rays
Read out electrical signals
Generate X-rays
Focus the beam
A CCD detector is mainly used in:
Direct DR
Indirect DR
CT
Ultrasound
The major advantage of DR over CR is:
Lower cost
Faster image acquisition
Higher patient dose
Complex maintenance
The bit depth of DR systems determines:
Image contrast resolution
Spatial resolution
Field of view
Exposure time
DR systems eliminate:
Digital storage
Chemical processing
Image noise
Collimation
The pixel size in DR affects:
Contrast
Spatial resolution
Exposure time
Detector efficiency
The detector quantum efficiency (DQE) measures:
X-ray absorption efficiency
Image brightness
Signal noise ratio
Exposure time
A high DQE value indicates:
Poor image quality
Better image quality with lower dose
More noise
Higher exposure required
The main limitation of DR systems is:
High cost and limited portability
Poor resolution
Need for chemical development
Low sensitivity
