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New 17-18 bushong
Rad technique digital
| Question | Answer |
|---|---|
| The two principal characteristics of a medical image are | Spatial resolution and contrast resolution |
| Spatial frequency is used to describe the quality of spatial resolution in terms of | line pairs |
| in digital imaging, spatial resolution is ultimately limited by | pixel size |
| As spatial frequency increases the object size _ and the spatial resolution _ | decreases, increases |
| A _ test tool is used to acquire data for an MTF curve | Bar pattern |
| The use of two screens in imaging results in higher | MTF |
| The number of gray shades that an imaging system can reproduce is called its | dynamic range |
| Screen film radiography has a dynamic range of | 1,000 |
| The bit capacity of each pixel identifies the _ of a digital imaging system | dynamic range |
| The _ digital imaging system uses the highest dynamic range. | mammography |
| The portion of useful image forming x-rays is referred to as the | signal |
| As mAs is increased the signal to noise ratio is | increased |
| Image detail is also called | spatial resolution |
| Of all radiography imaging systems, _ has the best contrast resolution | computed tomography |
| With digital imaging, patient dose can be reduced by using higher _ techniques | KVP |
| DQE is _ | detective quantum efficiency |
| If an image receptor has a high probability of interacting with the x-ray beam, then it has a high _ | DQE |
| The use of an image receptor with _ DQE can result in _ patient doses | High, lower low, and higher |
| The science of _ is the study of the response of the human eye to light | Photometry |
| What is the basic photometric unit? | Lumen |
| The decreasing luminous intensity with increasing distance from the source of light follows_ | the inverse square law |
| T/F A digital display device with higher megapixels has a better spatial resolution | True |
| Almost all medical flat panel digital display devices are _ | Monochrome liquid crystal displays |
| Medical flat panel display devices are identified by the _ | # of pixels |
| The ambient light a digital image workstation should be _ | near darkness |
| Flat-fielding is accomplished through automatic calibration images are called _ and | offset images, and gain images |
| Re-registering an image to correct for patient motion is done with | pixel shift |
| A computation of the mean pixel value within a region-of-interest is performed for _ | quantitative radiology |
| Post-processing includes all of the following except _ | signal interpolation |
| _ is corrected by the application of an offset voltage | Image lag |
| Within PACS network the secretarial workstation and the viewing workstation would be both called | clients |
| Text data and email are generated at a _ workstation in PACS. | RIS |
| Image file size is determined by _ size and gray scale | matrix |
| What is the file size of an image with 1026 x 1026 matrix and 2.5 byte gray scale | 2.6 mb |
| What is the spatial frequency of a digital system that can resolve 100um | 10 lp/mm |
| If a digital system has a spatial resolution of 4 lp/mm, it can resolve an object as small as _ mm | 4 |
| If a digital radiography imaging system has a spatial resolution of 10 lp/mm, what is the pixel size of that system? | 0.05 mm |
| If there were such thing as a perfect imaging system, the MTF would be equal to _ | 1 |
Created by:
MARCOZING