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Rad 141Test 1
Rad 141 Principles of Radiographic
| Question | Answer |
|---|---|
| The principle characteristic of the emulsion that makes it particularly x-ray sensitive is its: | Sensitivity |
| The radiographic film base appears blue | So that image viewing is more comfortable |
| The emulsion that is commonly used in x-ray film consist of which of the following | Silver halide and gelatin |
| A common base of contemporary x-ray film | Polyester |
| Which of the following are the two basic parts of radiographic film | Base and emulsion |
| Dimensional stability is the property of maintaining the size and shape of which of the following | Base |
| The principle purpose of gelatin in the emulsion is to: | Support the silver halide crystals uniformly |
| X-ray film is sensitive to which of the following | Only x-rays, gamma rays, and, visible light |
| Which of the following is a principle component of the emulsion | Silver bromide |
| The latent image actually is formed in the | Silver halide crystal |
| During the photographic process, metallic silver accumulates T the: | Sensitivity center |
| The latent image at the crystal level: | Is a collection of silver atoms |
| The term latent image actually refers to which of the following | An unprocessed image |
| The sensitivity center is usually silver..... | Sulfide |
| When the latent image is processed, what type of image does it become | Excited |
| What do we call the radiation exciting the patient that is responsible for latent image formation | Image-forming, remnant |
| The interstitial atoms in a crystal of silver halide include which of the following | Bromide, silver, iodine |
| If one observes a film immediately after exposure, what is seen | A latent image |
| Which of the following theories best explains the photographic effect | Gurney-Mott |
| The film base that provides the increased strength and thinner form needed for automatic processing is: | Polyester |
| The emulsion of a radiographic film is composed of silver halide and... | Gelatin |
| The atoms comprising the silver halide crystal are bond together by what kind of bond | Ionic bonds |
| How should radiographic film be stored, in order to prevent pressure artifacts on the film | On-end |
| Opened boxes of film should be stored at what temperature, and between what percent of of relative humidity | <68°F 20°C and 40-60% humidity |
| Characteristics of resolution | Greater the 1p/mm = Greater resolution |
| Characteristic of speed | Greater resolution = lesser speed = Greater exposure Lesser resolution = Greater speed = Lesser exposure |
| Characteristic of contrast | Greater subject contrast = lesser contrast film Lesser subject contrast = greater contrast film |
| Characteristic of latitude | Greater contrast film = narrow latitude Lesser contrast film = wide latitude |
| Radiographic intensifying screen speed increases with increasing... | Phosphor thickness |
| Direct-exposure, onscreen technique results in better... | Spatial resolution |
| The resolution achievable with slow speed radiographic intensifying screen is approximately | 15lp/mm |
| Which of the following factors controlled by the radiologic technologist affects radiographic screen speed the most | kVp |
| The intensifying factor characteristic | Greater for rare earth screens than for calcium tungstate screens |
| A phosphor currently used in radiographic intensifying screens is | Gadolinium oxybromide |
| Radiographic intensifying screens are used with radiographic film principally to | Reduce pt exposure |
| Because x-ray interaction with a phosphor produces light isotropically | The light spreads out |
| Mammography conducted with detail screens result in entrance skin exposures (ESE) as low as 300mR (3mGya). The intensification factor for these screens is about 30. If such an examination were conducted as a onscreen procedure, what would be the ESE? | 9000mR |
| Which of the following is a rare earth element | Gadolinium, yittrium, lanthanum |
| The principle advantage of rare earth screens over calcium tungstate screens is | Faster speed |
| Which of the following element is a green light emitter | Gradolinium |
| Which of the following principally contributes to the increased speed of rare earth screens | Conversion efficiency |
| The routine care of radiographic intensifying screens requires that they be | Periodically cleaned |
| Phosphor afterglow | Aka Lag |
| The pt exposure for a Direct-exposure CXR is 210mR. If a par-speed screen are used, the exposure required is 15mR. The intensification factor is: | 14 |
| A Direct-exposure radiograph requires 650mR. If the intensification factor of rare earth screens was 200, whT would be the patient exposure if such screens were used | 3.25mR |
Created by:
cbermud1