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Refers to clarity or resolution.
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Refers to misrepresentation of the actual size (magnification) or shape (foreshortening or elongation) of the structures imaged.
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RADT 456 I.A. & Eval
ARRT registry review covering Image Acquisition and Evaluation content area
| Question | Answer |
|---|---|
| Refers to clarity or resolution. | Recorded Detail pg. 296 |
| Refers to misrepresentation of the actual size (magnification) or shape (foreshortening or elongation) of the structures imaged. | Distortion pg. 296 |
| Occurs when the x-ray tube is angled. | Elongation pg. 302 |
| Refers to a phosphor's ability to absorb x-ray energy and convert it to fluorescent light energy. | Conversion Efficiency pg. 311 |
| _________ __________ __________ refers to how well a particular phosphor detects the presence of x-ray photons. | Detective quantum efficiency pg. 311 |
| The wavelength, or color, of light emitted must match the particular sensitivity of the film emulsion used is known as ________ _______. | Spectral matching pg. 311 |
| ________ is known as the luminescence from fluoroscopic screen phosphors. | Phosphorescence pg. 311 |
| The lingering luminescence after the termination of x-ray. | Afterglow pg. 311 |
| As phosphor size decreases, screen speed _______. | Decreases pg. 312 |
| Any combination of mA and time will produce an given mAs will produce identical image density. This is called _______ ________. | Reciprocity Law pg. 318 |
| To produce a perceptible change in radiographic density, and change of ___ percent is required. | 30 pg. 319 |
| When is a grid recommended? | If the body part is 10 cm or more pg. 325 |
| A grid with lead strip that are angled is called a ______ grid. | Focused pg. 336 |
| The height of the lead strips compared with the distance between them is know as. | Grid Ratio pg. 328 |
| Ascites, pneumonia, atelectasis, and rheumatoid arthritis are considered ___________ pathological conditions. | Additive pg. 335 |
| A three-phase 6-pulse generator has a _____% voltage ripple. | 13 pg. 336 |
| The response of the film emulsion to the variety of x-ray photons emerging from the irradiated part. | Film contrast pg. 342 |
| This is know as the ratio between the quantity of primary photons transmitted through the grid and the quantity of scattered photons transmitted. | Selectivity pg. 350 |
| What does the sensitometric/characteristic curve demonstrate? | The degree of film density as a result of exposure. pg. 353 |
| A margin on error one has with a given group of exposure factors. | Exposure Latitude pg. 355 |
| This is 2 dimensional and is know as the picture element. | Pixel pg. 364 |
| This term refers to the photons that have penetrated the part without interaction. | Signal pg. 364 |
| This term refers to Compton scatter and any other form of image-degrading fog. | Noise pg. 364 |
| Unexposed film should be stored at what temperature? | No greater than 70 degrees pg. 387 |
| Unexposed film should be stored is what humidity levels? | Between 40% and 70% pg. 387 |
| This functions to convert the latent image into the manifest image by reducing the exposed silver bromide grains/crystals to black metallic silver. | Developer pg. 391 |
| The developer temperature should be? | 92-95 degrees pg. 394 |
| This is an analysis and graphic representation of all the densities from the PSP screen, demonstrating the quantity of exposure, the number of pixels, and their values. | Histogram pg. 399 |
| Underexposure, incorrect processing algorithm selection, inadequate collimation, and grid cutoff are all causes of ________. | Graininess pg. 409 |
| What type of screen speed be used for extremities? | Slow pg. 410 |
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