Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
RADT 465: Image Acq
Image Acquisition and Evaluation
| Question | Answer |
|---|---|
| Geometric blur can be evaluated using all the following devices except (pg. 195 #1) | Penetrometer |
| In electronic imaging, as digital image matrix size increases (pg. 195 #3) | Pixel size decreases |
| An increase in added filtration will result in (pg. 195 #4) | A decrease in x-ray intensity and an increase in effective energy of the x-ray beam |
| An increase in kilovoltage will have which of the following effects (pg.196 #10) | More scattered radiation and the exposure rate will increase |
| The component of a CR image plate (IP) that records the radiologic image is the (pg. 197 #15) | Photostimulable phosphor |
| What is true in regard to x-ray absorptiometry? (pg. 197 #18) | Radiation dose is low and photon attenuation by bone is calculated |
| The luminescent light emitted by the PSP is transformed into the image seen on the CRT by the (pg. 197 #19) | ADC |
| Factors that contribute to film fog include (pg. 199 #28) | The age of the film, excessive exposure to light, and processor chemistry |
| Compared with a grid, a high ratio grid will (pg. 200 #32) | Absorb more scatter radiation and absorb more primary radiation |
| In comparison with 60 kV, 80 kV will (pg. 203 #46) | Permit greater exposure latitude and produce more scatter radiation |
| Causes of grid cutoff, when using focused reciprocating grids, include (pg. 203 #49) | Inadequate SID |
| Using a short (25-30 in) SID with a large (14x17 in) IR is likely to (pg. 203 #51) | Increase the anode heel effect |
| Chemical fog may be attributed to (pg. 204 #53) | Excessive developer temperature, oxidized developer, excessive replenishment |
| The voxel is associated with all of the following (pg. 204 #56) | Bit depth, volume element, and is measured in Z direction |
| The main difference between direct capture and indirect capture DR is that (pg. 205 #59) | Direct capture / conversion has so scintillator |
| Types of shape distortion include (pg. 206 #67) | Elongation and foreshortening |
| All of the following are related to recorded detail (pg. 206 #70) | Focal spot size, SID, and OID |
| A 15% decrease in kilovoltage accompanied by a 50% increase in milliampere-seconds will result in (pg. 207 #77) | Shorter scale of contrast |
| Focal spot blur is greatest towards (pg. 207 #80) | The cathode end of the x-ray beam |
| What materials may be used as grid interspace material? (pg. 208 #87) | Plastic and aluminum |
| What can impact the visibility of the anode heel effect? (pg. 208 #89) | SID and IR size |
| What effects the quantity and the quality of the primary beam? (pg. 211 #108) | Half-value layer (HVL) and Kilovoltage (kV) |
| Potential digital image postprocessing tasks include (pg. 212 #112) | Annotation and inversion/reversal |
| HVL is affected by the amount of (pg. 212 #115) | kVp and beam filtration |
| Examples of health care informatics include (pg. 214 #129) | RIS and PACS |
| In digital imaging, as DEL size decreases (pg. 216 #142) | Spatial resolution increases |
| Focusing distance is associated with what? (pg. 217 #152) | Grids |
| Brightness and contrast resolution in digital imaging can be influenced by (pg. 219 #165) | Window level (WL), window width (WW), look-up table LUT) |
| What feature is used to display RIS information on current patients? (pg. 219 #166) | Modality work list |
| A decrease from 200 to 100 mA will result in a decrease in what? (pg. 219 #167) | Exposure rate and beam intensity |
| A QA program serves to (pg. 221 #186) | Keep the patient dose to a minimum, keep radiographic density consistent, and ensure equipment efficiency |
| Any images obtained using dual x-ray absorptiometry (DXA) bone densitometry (pg. 222 #188) | Are used to evaluation accuracy of the region of interest (ROI) |
| What term is used to describe unsharp edges of tiny radiographic details? (pg. 224 #207) | Blur |
| What are classified as rare earth metals? (pg. 224 #208) | Lanthanam oxybromide and gadolinium oxysulfide |
| X-ray film emulsion is most sensitive to safe-light fog (pg. 225 #211) | After exposure |
| What has the greatest effect on radiographic density / brightness? (pg. 225 #216) | SID |
| How often are radiographic equipment collimators required to be evaluated? (pg. 226 #222) | Semiannually |
| In digital imaging, as the size of the image matrix increases, (pg. 226 #223) | Pixel size decreases, spatial resolution increases |
| Geometric unsharpness is directly influenced by (pg. 227 #230) | OID |
| As window level increases (pg. 229 #240) | Brightness increases |
| What units are used to express resolution? (pg. 230 #246) | Line-spread function and line pairs per millimeter |
| Which of the following are methods used for x-ray film silver reclamation? (pg. 230 #247) | Metallic replacement method and electrolytic method |
Created by:
rdwilliams1
Popular Radiology sets