Term
| (True or False) The mA meter is connected in parallel in the secondary side of the high voltage circuit. |
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Definition
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Term
| What two types of processes produce scatter radiation? |
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Definition
1. Compton Effect
2. Photoelectric Effect |
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Term
| The principle contributor to radiographic noise in many radiographic imaging procedures is _______ ______. |
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Definition
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Term
| Resolution and noise are intimately connected to a third characteristic of radiographic quality known as _____. |
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Definition
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Term
| The primary control of OD is ___. |
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Definition
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Term
| What three factors must be considered before each radiographic examination in order to ensure optimum radiographic quality? |
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Definition
1. Image Receptor
2. Technical Factors
3. Positioning |
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Term
| The difference between the highest or lowest point on an electromagnetic wave and the center of gravity of the wave is called what? |
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Definition
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Term
| The marriage of what two devices is said to have been the beginning of modern x-ray technology? |
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Definition
1. Snook Transformer
2. Coolidge Tube |
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Term
| The "Z" # of the atom is determined by what? |
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Definition
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Term
| The speed of light is equal to what? |
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Definition
186,000 miles per second
or
3 x 108 meters per second |
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Term
| The steeper the angle of the target, the smaller the effective focal spot - is what principle? |
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Definition
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Term
| Why do many new high-capacity x-ray tubes have metal enclosures instead of glass? |
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Definition
| Because metal enclosures reduce radiation exposure. |
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Term
| All electromagnetic waves move through space at the same speed, but they differ in _________, __________, and _________. |
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Definition
| frequency, wavelength, and amplitude |
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Term
| The ____ _____ _________ reduces the effective focal spot while permitting as large an actual focal spot as possible, thus improving image resolution and tube heating capacity. As the target angle decreases so does the effective focal spot. |
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Definition
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Term
| The manner in which electric currents behave in an electric circuit is described by a relationship known as _____ ___. |
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Definition
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Term
| The anode target area is usually coated w/ what substance? |
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Definition
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Term
| What is the Inverse Square Law? |
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Definition
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Term
| What are 3 characteristics of highly penetrating x-rays? |
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Definition
1. High Frequency
2. High Energy
3. Short Wavelength |
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Term
| Which x-ray image production factors are primarily responsible for the quantity of radiation produced? |
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Definition
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Term
| How is the atomic mass of an atom calculated? |
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Definition
| The # of protons plus the number of neutrons |
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Term
| Air must be removed not only from the interior of the tube but also from the glass and metal parts as well by prolonged baking before the tube is sealed. This process is known as _________. |
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Definition
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Term
| Both low voltage and high voltage are used in the x-ray tube to produce x-rays. The purpose of the low voltage is to: |
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Definition
| create a cloud of electrons around the filament |
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Term
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Definition
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Term
| What is the % efficiency formula? |
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Definition
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Term
| What is the formula to find the maximum amount of electrons that can be in a specific shell? |
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Definition
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Term
A radiographer can use which of the following principles to adjust their technique?
A. Inverse Square Law
B. Ohm's Law
C. 15% Rule |
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Definition
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Term
| The amount of energy transferred by ionizing radiation per unit length of path is known as ___. |
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Definition
| LET "Linear Energy Transfer" |
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Term
| The principle application of a transformer in an x-ray imaging system is to: |
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Definition
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Term
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Definition
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Term
| What is the unit of measure of exposure? |
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Definition
|
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Term
| What is the amount of energy absorbed per gram of irradiated matter? |
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Definition
|
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Term
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Definition
| 1 RAD (radiation absorbed dose) |
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Term
| ___ is the energy absorption per 100 ergs per gram. |
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Definition
| RAD (radiation absorbed dose) |
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Term
| The ability to distinquish anatomic structures of similar density is known as: |
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Definition
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Term
| As a result of photoelectric interaction, an electron is ________. |
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Definition
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Term
| (True or False) For a photoelectric interaction to occur, the energy of the incident x-ray photon must be equal to or greater than the binding energy of the target electron. |
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Definition
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Term
Which of the following is not one of the most important characteristics of radiographic quality?
A. Speed
B. Contrast Resolution
C. Noise
D. Spatial Resolution
E. Artifacts |
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Definition
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Term
| In half-wave rectification, each inverse half-cycle in the primary circuit corresponds to how many voltage pulses across the x-ray tube? |
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Definition
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Term
| For any given radiograph, the # of x-rays reaching the IR is directly related to current and ____. |
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Definition
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Term
| The OD of unexposed film is due to ____ and ___ _______. |
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Definition
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Term
| The ability to image small objects w/ high subject contrast is called _______ __________. |
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Definition
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Term
| Does film speed affect subject contrast? |
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Definition
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