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WorksheetsCT Scan Quiz
Total questions: 50
Worksheet time: 25mins
CT stands for:
Contrast Tomography
Computed Tomography
Conventional Tomography
Cranial Tomography
The inventor of CT scan was:
Wilhelm Roentgen
Godfrey Hounsfield
Marie Curie
Wilhelm Weber
The year in which the first clinical CT scanner was introduced:
1965
1972
1980
1950
The unit used to measure CT numbers is:
Gray
Roentgen
Hounsfield Unit
Sievert
The X-rays used in CT scanning are produced by:
Gamma rays
Radioactive isotopes
X-ray tube
Laser beams
The primary advantage of CT over conventional radiography is:
Higher dose
Cross-sectional imaging
Lower resolution
Simpler operation
The part of CT scanner that detects transmitted X-rays is:
Gantry
Detector array
Collimator
Couch
The CT number for water is:
0
100
-1000
+1000
The CT number for air is approximately:
+1000
0
-1000
+500
The CT number for bone is approximately:
-1000
+1000
0
+500
Slice thickness in CT affects:
Spatial resolution
Image contrast
Both A and B
None
The CT image is composed of:
Pixels only
Voxels
Lines
Frames
The mathematical process used in image reconstruction in CT is:
Differentiation
Integration
Fourier Transform
Filtration
The CT gantry houses:
Patient couch
X-ray tube and detectors
Computer
Monitor
In helical CT, the X-ray tube:
Rotates in steps
Rotates continuously
Is fixed
Moves up and down
The pitch in helical CT refers to:
Slice thickness
Table movement per rotation
Tube voltage
Filter width
The typical kVp range used in CT scanning is:
50–70 kVp
80–120 kVp
140–160 kVp
30–50 kVp
The function of the collimator in CT is to:
Filter noise
Shape the X-ray beam
Increase detector sensitivity
Reduce scatter
The matrix size of a standard CT image is:
64×64
128×128
512×512
1000×1000
The slice thickness in CT is measured in:
mm
cm
inches
meters
The X-ray tube in CT rotates around the:
Table
Detector
Patient
Room
The main limitation of CT is:
Long time
High radiation dose
Poor resolution
No 3D capability
The first generation CT scanner used:
Multiple detectors
Single detector
Fan beam
Spiral beam
The reconstruction algorithm most commonly used is:
Back projection
Filtered back projection
Simple addition
Linear regression
The contrast media used in CT are usually:
Barium-based
Iodine-based
Gadolinium-based
Saline
The gantry tilt in CT is measured in:
Degrees
Radians
cm
mm
The CT dose index (CTDI) measures:
Image resolution
Radiation dose
Scan time
Slice thickness
The main purpose of filters in X-ray tubes is to:
Reduce low-energy photons
Increase intensity
Focus beam
Reduce scatter
The discovery of X-rays was made by:
Marie Curie
Wilhelm Roentgen
Ernest Rutherford
William Coolidge
X-rays are part of:
Infrared radiation
Visible light
Electromagnetic spectrum
Sound waves
X-rays are produced when:
Electrons hit the target anode
Protons collide
Neutrons decay
Light is refracted
The filament in an X-ray tube is made of:
Copper
Tungsten
Silver
Lead
The target in the X-ray tube is made of:
Iron
Tungsten
Aluminum
Copper
The anode angle in X-ray tubes affects:
Beam quality
Field size
Both A and B
None
The protective housing of an X-ray tube prevents:
Beam scatter
Leakage radiation
Electrical loss
Cooling
The function of the collimator in X-ray is to:
Increase resolution
Restrict beam size
Increase exposure
Produce contrast
The unit of radiation exposure is:
Gray
Sievert
Roentgen
Becquerel
The unit of absorbed dose is:
Sievert
Gray
Roentgen
Curie
The unit of dose equivalent is:
Sievert
Gray
Roentgen
Becquerel
The main advantage of digital radiography is:
Longer exposure
Immediate image viewing
Poor image quality
No contrast
The kVp in X-ray controls:
Quantity of X-rays
Quality (penetration)
Exposure time
Filtration
The mA in X-ray controls:
Beam penetration
Quantity of X-rays
Patient dose
Image contrast
Scatter radiation can be reduced by using:
Filter
Grid
Higher kVp
Large field
The focal spot size affects:
Image sharpness
Exposure
Patient dose
Beam filtration
A higher kVp results in:
More contrast
Less contrast
No effect
Lower penetration
The anode heel effect is due to:
Filtration
Geometry of the anode
Scatter
Reflection
The photoelectric effect is dominant in:
Low kVp range
High kVp range
Ultrasound
MRI
In X-ray imaging, the main form of noise is caused by:
Quantum mottle
Electric current
Tube heating
Beam hardening
Beam hardening artifact is common in:
X-ray
CT
Ultrasound
MRI
The primary control of patient dose in CT is:
kVp
mA and scan time
Collimator
Gantry tilt
