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39 Cards in this Set
- Front
- Back
To provide the radiologist a radiograph of optimum quality with the least exposure.
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X-ray Production
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A recorded image, produced by x-rays on photographic film.
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Radiograph
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Energy associated with electro & magnetic fields.
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Electromagnetic Waves
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Measured from crest to crest.
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Wavelength
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What is the symbol for wavelength?
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λ (lambda)
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Wavelength is measured in ______.
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Angstrons Å
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Short wavelength has _______ energy.
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High
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Long wavelength has ______ energy.
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Low
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Name all 8 Characteristics of x-rays.
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1. High energy waves (photons or quantum)
2. No mass 3. No charge (neutral) 4. Travel at the speed of light (186,00 mi/sec or 3x10^10 cm/sec or 3x10^8 m/sec) 5. Are invisible to the human eye 6. Travel in straight lines 7. Cannot be focused with a lens 8. Adversely affect living tissue |
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Number of crests passing a fixed point per. second.
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Frequency
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What symbol for Frequency is?
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ν (Nu)
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Frequency is measured in ______.
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Hertz
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Short wavelength has _______ frequency.
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High
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Long wavelength has _______ frequency.
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Low
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How are x-rays are produced?
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When high speed electrons are slowed or stopped suddenly.
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X-rays produced _____ heat and ________ x-rays.
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~ 99% ~ 1%
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Flow of electrons through a conductor.
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Current (amps)
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Voltage is also know as ___________ & __________ .
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* Potential Difference (PD) *Electromotive Force (EMF)
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__________Current controls the boiling off of electrons.
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Filament
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Filament current has ______voltage and ______ amperage.
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Low
High |
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_______ current controls the current going through the tube.
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Tube
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Tube current has ______ voltage and ______ amperage.
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High
Low |
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Tube current has a range of ___ to ___ kV.
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20
150 |
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1 kV equals ______ volts.
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1,000
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_______ controls the Quantity of x-rays.
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mA (milliamps)
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What results in a large focal spot and greater heat capacity?
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Large Filament
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What results in a small focal spot and less heat capacity?
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Small Filament
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What actually adjusts the filament current (boiling off of more or less electrons)?
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mA Control
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What measures the tube current, the number of electrons crossing the tube gap during the “exposure”?
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mA Measurement
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What is the mAs equation?
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mA x s = mAs
milliamps x time in sec. = milliampere seconds |
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Length of time electrons are accelerated across the tube gap, or length of time kV is applied is called?
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Exposure Time
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________ controls Quality of x-rays.
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kV (kilovotage)
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What helps control the fogging effect (absorbs most secondary & increases contrast).
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Grid
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What comes from secondary radiation (causes extra density superimposed over expected density).
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Fogging Effect
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Long scale equals ________ contrast.
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Low
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Short scale equals ________ contrast.
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High
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The differences between light & dark areas on adjacent parts of a radiograph. (density differences between adjacent areas).
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Radiographic Contrast
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The degree of blackening on an x-ray film.
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Density
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kVp is called?
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Kilovoltage peak
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