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Unit 5.1 test
GXMO
| Question | Answer |
|---|---|
| Programed techniques correspond to anatomy to be x-rayed. | APR |
| APR | Automatically Programmed Radiography |
| AEC | Automatic Exposure Control |
| The operator selects an X-ray detector area corresponding , to the anatomy of interest | AEC |
| Directly proportional to the quantity of the x-ray beam | mAs |
| Determines quality of the x-ray beam | kVp |
| Affects sharpness of the image | Focal Spot Size |
| True regarding Automatic Exposure Control | Requires accurate positioning No table top procedures consistent density |
| X-ray of the hand requires ________ kVp than an x-ray of the abdomen. | Less |
| Should be set to terminate the exposure in the event of an AEC failure. | Back-up timer |
| This starts the anode rotation and filament heating. | Rotor |
| Basic structure of the x-ray tube. | Pyrex glass envelope |
| Source of electrons | Filament |
| Elements that makes up the filament wire and the anode? | Tungsten |
| Supplies the voltage required for x-ray production. | Step-up Transformer |
| Created when an incoming electron is suddenly slowed down, changes direction and leaves the tungsten atom. | Bremsstrahlung Radiation |
| Below______kVp there are no characteristic photons, | 70 |
| The filament is located in a hollow area in the _________. | Anode |
| Created when an incoming electron interacts with the k-shell electron and knocks it out of orbit | Characteristic radiation |
| Electrons are repelled toward the anode to an area on the target called the _________. | Focal spot |
| Which of the following is the correct term for the amount of detail seen on the visible x-ray image. | Spatial resolution |
| Used on larger patients or thick and dense body parts. | Large focal spots |
| Without ______ _______ , the electron stream spreads beyond the target area. | Focusing Cup |
| A _______ spot size is the measurement of the focal spot on the target surface affects tube heat capacity and is big. | Actual |
| a _______spot size is the measurement of the vertical projection of the actual focal spot, affects image resolution and is small. | Effective |
| Excellent material for x-ray tube targets because it has a very high melting point and it is efficient at conducting heat away from the anode. | Tungsten |
| The tungsten focal area all around the beveled edge of the rotating anode is called. | Focal Track |
| The intensity of the x-ray beam is least toward the anode end of the field. True or false | True |
| Since x-rays with shorter wavelengths are more penetrating , the penetrating power or the x-ray beam is controlled by varying the . | kVp |
| Contrast in the radiographic image is controlled by ? | the kVp |
| Density and total quantity of exposure is controlled by? | mAs |
| In radiology the _____ is directly proportional. | mA |
| Primary purpose of filtration? | Reduce patient dose |
| Material commonly used t filter the x-ray beam is? | aluminum |
| X-ray equipment capable of producing 70 kVp or more is required to have total filtration of at least ______mm Al Equiv. | 2.5 |
| Voltage is energy causing electron movement sue to oppositely charged particles attracting, and like charges repelling. What is voltage also called? | Potential Difference |
| Device that allows current to flow in only one direction? | Diode |
| Device with more turns or coils on the secondary side than on the primary side? | Step-up transformer |
| Functions of automatic transformer. | means for kVp selection, compensation for fluctuation in the incoming line voltage, Supplies power to other parts of the x-ray circuit |
| Section of the s-ray generator contains the control console devices, main switch, line meter, and kVp selector? | Low Voltage circuit |
| Section of the x-ray generator contains the mA selector, the primary of the step-down transformer, and the x-ray tube filament | Filament circuit |
| How many diodes are used in full-wave rectificatopn | 4 |
| The alternating current used to supply most x-ray machines is comprised of ________full cycles (peak and valley) per second. | 120 |
| Types of x-ray generator. | Single-phase Three-Phase High -frequency |
| Feature that will terminate the exposure time when a certain quantity or amount of radiation has been detected by the image receptor. | AEC |
Created by:
mistiechris