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In fluoroscopy, pulse rate is the number of exposures per second? T/F
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When using magnification mode, the fluoroscopes needs to set the exposure factors higher to compensate for the reduced diameter useful input phosphor: T/F
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RADT171 T#1
| Question | Answer |
|---|---|
| In fluoroscopy, pulse rate is the number of exposures per second? T/F | True |
| When using magnification mode, the fluoroscopes needs to set the exposure factors higher to compensate for the reduced diameter useful input phosphor: T/F | False |
| When CCD is exposed to light, it generates and briefly stores light energy? T/F | True |
| Is considered a primary beam? | Fluoroscopic x-ray beam |
| Digital fluoroscopy is improved by using: | Charge-coupling device(CCD) |
| Type of exposure control switch is used in fluoroscopy? | Dead man’s foot pedal |
| Output phosphor | Absorbs electrons and emits light |
| Input phosphor | Absorb x-ray and emits light, convert to visible light |
| Photocathode | Bonded directly to the input phosphor |
| Made of cesium Iodide, needle shape: | Input phosphor |
| Essentially the sum total of air Kerma over the exposed area of the patients body surface? | Dose area product |
| Types of ionizing radiation that produce virtually the same biologic effect for equal dose in body tissue: | X-rays, beta particles, and gamma rays |
| The image intensifier was introduced in the: | 1950s |
| Photoemission occurs at the: | Photocathode |
| The____is found along the entire length of the image intensifier? | Electrostatic focusing lenses |
| The recording device that “photographs” the image off of the output phosphor is the: | Film cameras for spot filming |
| The detectors to produce high-quality fluoroscopic images, they must able to: | Respond quickly, respond many times in a row, application specific integrated |
| An expression of the ability of an image intensifier tube to convert x-ray energy into light energy and increase the brightness of the image in the process is the? | Brightness gain |
| When operated in magnification mode, the electrostatic lenses have___of a negative charge | More |
| A disadvantage of using magnification mode during fluoroscopy is: | Patient receives additional dose |
| Customary and SI units for absorbed dose? | Rad; gray |
| Two improvements to fluoroscopy brought with image intensifier? | Brightened, reduce radiation |
| Amount of radiation to be safe? | None |
| First radiation worker to die of radiation? | Clarence Dally |
| Job of image intensifier? | Increase brightness |
| 5 main components of image intensifier? | Input phosphor, photocathode, electrostatic focusing lenses, accelerating anode, output phosphor |
| Customary and SI units used for occupational radiographer monitoring : | REM; Sievert |
| When the electron beam is sweeping the anode, if the electron beam and light from the output phosphor are incident on the same time,____through the target to the signal plate: | Electrons are transmitted |
| Amount of light emitted by the input phosphor is proportional to: | Number of x-ray received |
| Purpose of glass envelope of image intensifier? | Creates vacuum |
| Process of photocathode responding to light from input phosphor: | Photoemission |
| Job of focusing lenses? | Negative charged lenses, helping focusing |
| Automatic adjustment of kVp and/or mAs as needed to maintain contrast and density of the fluoroscopic image? | Automatic brightness control (ABC) |
| Customary and SI units for exposure? | Roentgen; air kerma |
| Requires more radiation to produce quality fluoroscopic images? | Conventional image intensifier |
| Output phosphor is made of: | Zinc cadmium sulfide |
| The image intensifier is located in: | Inside the fluoroscopic tower |
| Photocathode is made of? | Cesium and antimony compounds |
| Accelerating Anode is designed to: | Set the electron stream in motion at a constant velocity |
| Allows imaging of the movement of internal structures. It’s use of a continuous or pulse beam of x-ray to create images of moving internal structures that can be viewed on a monitor: | Fluoroscopy |
| The amount of energy per unit mass absobed | Absorb dose |
| The basic unit of electrical charge | Coulomb |
| SI quantity used to express the energy | Air kerma |
| To adjust the quantity of equivalent dose: | Effective dose |
| To adjust the value of the absorbed dose | Equivalent dose |
| A dose of radiation lower individual | Threshold dose |
| Imprecise measure of the quantity | Exposure |
Created by:
Faithshay