Podcast
Questions and Answers
What is the expected image on a radiograph exposed to 70 kVp, 100 mA, 100 ms from a full wave 3 phase x-ray unit?
What is the expected image on a radiograph exposed to 70 kVp, 100 mA, 100 ms from a full wave 3 phase x-ray unit?
- Decreased contrast and density
- No change in contrast and density
- Blurred image
- Increased contrast and density (correct)
Which of the following will serve to increase effective energy of the x-ray beam?
Which of the following will serve to increase effective energy of the x-ray beam?
- Increase in mA
- Decrease in exposure time
- Increase in kV (correct)
- Increase in added filtration
What is indicated by visualizing 8 dots (dashes) on a finished film during a spinning top test at 200 mA, 0.05 s, and 70 kVp?
What is indicated by visualizing 8 dots (dashes) on a finished film during a spinning top test at 200 mA, 0.05 s, and 70 kVp?
- Overexposure due to incorrect exposures
- The kVp setting is inaccurate
- Underexposure due to incorrect exposures
- The 0.5 sec time station is inaccurate (correct)
When comparing the mR output at 50 mA @ 0.2 s, 100 mA @ 0.1 s, and 200 mA @ 0.05 s while increasing the mAs using different mA and time combinations, this is part of which QC test?
When comparing the mR output at 50 mA @ 0.2 s, 100 mA @ 0.1 s, and 200 mA @ 0.05 s while increasing the mAs using different mA and time combinations, this is part of which QC test?
In which portion of the x-ray circuit is a step-down transformer located?
In which portion of the x-ray circuit is a step-down transformer located?
If a high-voltage transformer has 100 primary turns and 35,000 secondary turns, and is supplied by 220 V and 75 A, what is the voltage across the secondary coil?
If a high-voltage transformer has 100 primary turns and 35,000 secondary turns, and is supplied by 220 V and 75 A, what is the voltage across the secondary coil?
Which of the following will serve to increase the effective energy of the x-ray beam?
Which of the following will serve to increase the effective energy of the x-ray beam?
What is indicated by visualizing 8 dots (dashes) on a finished film during a spinning top test at 200 mA, 0.05 s, and 70 kVp?
What is indicated by visualizing 8 dots (dashes) on a finished film during a spinning top test at 200 mA, 0.05 s, and 70 kVp?
When comparing the mR output at 50 mA @ 0.2 s, 100 mA @ 0.1 s, and 200 mA @ 0.05 s while increasing the mAs using different mA and combination, this is part of which QC test?
When comparing the mR output at 50 mA @ 0.2 s, 100 mA @ 0.1 s, and 200 mA @ 0.05 s while increasing the mAs using different mA and combination, this is part of which QC test?
In which portion of the x-ray circuit is a step-down transformer located?
In which portion of the x-ray circuit is a step-down transformer located?
What will serve to increase the effective energy of the x-ray beam?
What will serve to increase the effective energy of the x-ray beam?
If a high-voltage transformer has 100 primary turns and 35,000 secondary turns, and is supplied by 220 V and 75 A, what is the secondary voltage?
If a high-voltage transformer has 100 primary turns and 35,000 secondary turns, and is supplied by 220 V and 75 A, what is the secondary voltage?
Flashcards
70 kVp Exposure - Expected Image Quality
70 kVp Exposure - Expected Image Quality
Increased contrast and density are expected on a radiograph exposed with 70 kVp, 100 mA, 100 ms.
Increasing X-ray Beam Energy
Increasing X-ray Beam Energy
Increasing kV (kilovoltage) increases the effective energy of the x-ray beam.
Spinning Top Test - 8 Dots
Spinning Top Test - 8 Dots
8 dots (dashes) on a spinning top test film at 200 mA, 0.05 s, 70 kVp indicates an inaccuracy in the 0.5 second time station.
Linearity QC Test
Linearity QC Test
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Filament Circuit Transformer
Filament Circuit Transformer
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High-Voltage Transformer, Turns Ratio
High-Voltage Transformer, Turns Ratio
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Increasing X-ray Beam Effective Energy
Increasing X-ray Beam Effective Energy
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Spinning Top Test - 8 Dots
Spinning Top Test - 8 Dots
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Linearity QC Test
Linearity QC Test
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Filament Circuit
Filament Circuit
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High-Voltage Transformer Secondary Voltage Calculation
High-Voltage Transformer Secondary Voltage Calculation
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Increasing X-ray Beam Effective Energy
Increasing X-ray Beam Effective Energy
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Study Notes
Radiograph Image Characteristics
- A radiograph exposed to 70 kVp, 100 mA, 100 ms from a full wave 3 phase x-ray unit is expected to have a certain image appearance.
X-ray Beam Energy
- Increasing the kVp will serve to increase the effective energy of the x-ray beam.
- Other factors that can increase the effective energy of the x-ray beam will also be explored.
Spinning Top Test
- Visualizing 8 dots (dashes) on a finished film during a spinning top test at 200 mA, 0.05 s, and 70 kVp indicates a specific outcome.
Quality Control (QC) Tests
- Comparing the mR output at 50 mA @ 0.2 s, 100 mA @ 0.1 s, and 200 mA @ 0.05 s while increasing the mAs using different mA and time combinations is part of a QC test.
X-ray Circuit Components
- A step-down transformer is located in the x-ray circuit.
Transformer Calculations
- If a high-voltage transformer has 100 primary turns and 35,000 secondary turns, and is supplied by 220 V and 75 A, the voltage across the secondary coil is 15,750 V.
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