Term
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Definition
| source to image receptor distance; distance from the focal spot (origin of x-ray production) to the image recording device. Traditionally 40" or 72" |
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Term
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Definition
| object to image receptor distance; distance for the patient to the image receptor |
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Term
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Definition
| source to object distance; distance from the focal spot (origin of x-ray production) to the patient |
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Term
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Definition
| milliamperage; determine the size of the electron cloud - which in turn, along with time, determines the number of x-rays produced; quantity |
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Term
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Definition
| kilo-voltage peak; the peak of the high-voltage that crosses the tube from cathode to anode - hurls (the push behind) the electron cloud to collide with the anode; higher kVp - greater the collision - higher the energy/penetration of the beam |
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Term
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Definition
| the ability of the x-ray photons to make it through the patient and strike the IR; controlled by the kVp |
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Term
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Definition
| image receptor; image recording device; aka imaging plate (IP) |
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Term
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Definition
| focal spot size; the size of the surface on the anode that is struck by the electron cloud - either large or small - smaller creates better spatial resolution (detail) |
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Term
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Definition
| the actual surface area that is struck by the electron cloud - actual area of origin of the x-rays |
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Term
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Definition
| the size of the focal spot projected downward toward the patient/IR; is always smaller than the actual FSS |
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Term
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Definition
| loss of x-ray photon from the primary (1⁰) beam to the secondary (2⁰); 1⁰ minus 2⁰; due to absorption & scatter |
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Term
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Definition
| the x-ray beam that have exited the tube but not yet made it to the patient; aka incident beam |
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Term
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Definition
| x-ray beam that has exited the patient; aka exit beam or remnant beam |
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Term
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Definition
| x-ray photons that have been misdirected by interaction with atoms within the patient; always unwanted because they degrades the image |
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Term
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Definition
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Term
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Definition
| electrons that have been "boiled" off the filament |
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Term
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Definition
| the electrons driven across the air gap (filament to anode) by the kVp |
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Term
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Definition
| bundles of energy; x-rays are photons |
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Term
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Definition
| x-ray photons that have transferred all of their kinetic energy into tissue |
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Term
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Definition
| negative side of the tube; contains the filament and focusing cup |
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Term
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Definition
| positive side of the tube; contains the focal track (focal spot) |
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Term
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Definition
| small wires in the cathode that are the source of electron |
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Term
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Definition
| the surface of the anode where x-rays are produced |
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Term
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Definition
| x-ray beam that has left the tube but has not yet made it to the patient; primary beam |
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Term
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Definition
| x-ray beam that has left the patient but has not yet made it to the IR; secondary beam; exit beam |
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Term
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Definition
| millamps per second; total number of x-rays in the beam; quantity |
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Term
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Definition
| how much heat the filament can withstand; determined by the filament size |
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Term
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Definition
| imaging plate; image receiving plate; aka IR |
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Term
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Definition
| field of view; measurement of the amount of anatomy seen on the image |
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