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What technical factor contributes to the subject contrast of the remnant x-ray beam in digital imaging?
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What is the term used to describe the appearance of wavy linear lines on an image obtained using computed radiography and a stationary grid?
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RADT465/Image Prod.
ARRT Registry review covering Image Production content area
| Question | Answer |
|---|---|
| What technical factor contributes to the subject contrast of the remnant x-ray beam in digital imaging? | kVp |
| What is the term used to describe the appearance of wavy linear lines on an image obtained using computed radiography and a stationary grid? | Aliasing Artifact |
| What are the components of a DEL? | Sensing Area, TFT, and Capacitor |
| Of the components affecting geometric un-sharpness (Focal Spot Size, OID, and SID), which affects it inversely? | OID |
| What part of the DEL stores electrical charge? | Capacitor |
| What effect does increasing the kVp have on image contrast? | Decreases Image Contrast |
| What combination of kVp and mAs technical factors would result in quantum mottle? | High kVp and Low mAs |
| What technical factor influences photon energy? | kVp |
| Off-centering the grid will result in grid cutoff with what appearance? | Overall loss of receptor exposure |
| What post-processing function is responsible for removing high frequency noise from the x-ray image? | Edge Enhancement |
| What is the minimum mAs that will be achieved with a set technique of 500 mA and 70 kV, and a minimum response time of .25 ms? | 12.5 mAs |
| What two units can be used to express resolution? | Line-Spread Function and Line Pairs Per Millimeter |
| If an image, obtained using a 12:1 grid, demonstrates loss of signal at its lateral edges, this most likely indicates what error? | Too Great of SID |
| What is the term used to describe the system where an anatomic part is selected and an electronic technique chart is applied? | Anatomically Programmed Radiography (APR) |
| An artifact of an object appears on an image as bright white with sharply delineated edges, where is this artifact most likely located in relation to the patient and IR? | On/In the IR |
| What affect does a decrease in kVp have on photon energy and receptor exposure? | Decreased Photon Energy and Receptor Exposure |
| What is the primary function of x-ray beam filtration? | Reduce Patient Skin Dose |
| An image is obtained utilizing a 36 inch SID, 9mAs, and 80kVp. If the kVp is reduced to 70, and the SID is increased to 40 inches, what would the new required mAs be in order to maintain the same image exposure? | 22 mAs |
| An image is obtained utilizing 85 kVp, 300 mA, and 40ms. What changes could be made to reduce the exposure by half? | Reduce the kVp by 15% = 72 kVp; Half the mA = 150 mA; Half the ms = 20 ms. |
| What technical factor has the greatest impact on radiographic IR exposure? | kVp |
| What factors affect subject contrast? | Tissue Z#, Differential Tissue Absorption, and kVp |
| What is the grid ratio of a grid with a lead strip height of 5mm, and an interspace of .5mm? | 10:1 |
| What change in technical factors would osteomalacia require? | Decrease Technical Factors |
| What is the major difference between CR and DR? | DR imaging immediately displays the image, while CR imaging requires an extra process to display the image |
| What is the term used to define a volume element and what direction is a volume element measured in? | Voxel; Z Direction |
| In order to repeat an exposure taken with an 85 kVp, 12 mAs, and 16:1 grid ration, after replacing the grid with an 8:1 grid ratio, what new mAs must be used? | 8 mAs |
| What multiplication factor is associated with each grid ratio? | No Grid - 1 5:1 - 2 6:1 - 3 8:1 - 4 10:1 or 12:1 - 5 16:1 - 6 |
| Which imaging system requires analog to digital conversion? | CR |
| What layers are CR PSP plates composed of in order? | Protective, Phosphor, Electroconductive, Support, Light-Shield, and Protective |
| How does the prone position, for abdominal imaging, reduce the production of scatter? | Natural Compression |
| If an exposure is obtained utilizing 90 kVp at 3 mAs without a grid, but you would like to repeat the exposure with a 12:1 grid, what new mAs would you use? | 15 mAs |
| If an exposure is obtained utilizing a 36" SID, 12 mAs, and 12:1 grid, but you would like to repeat the exposure with a 42" SID and 5:1 grid, what new mAs would you need in order to maintain the same exposure? | 6.5 mAs |
| What is the relationship between image resolution, DEL size, and fill factor? | Image resolution improves as DEL size decreases and fill factor increases |
| What impact does increasing SOD have on spatial resolution? | Increases Spatial Resolution |
| What material makes up the front of an image plate? | Magnesium or Carbon Fiber |
| With a 512 x 512 matrix and 20 cm field size, what would the pixel size be? | 0.4 mm/pixel |
| If an exposure is obtained utilizing 300 mA, 4 ms, and 90 kVp, but you would like to repeat the exposure with an 8:1 grid, what new mAs would you use? | 4.8 mAs |
| Tube angle, structure position, and radiographic positioning can all create what type of imaging error? | Distortion |
| To compensate for an OID of 8 inches, what adjustment must be made to the SID? | Increased 56" |
| When obtaining an image utilizing a focused reciprocating grid, what is a major cause of grid cutoff? | Inappropriate SID |
| What affect does scattered radiation have on image contrast? | Increases Contrast |
| Which postprocessing function refers to the dynamic range compression? | Equalization |
| What effect does mAs have on brightness? | No Effect |
| Which technical setting affects both the quantity and quality of the primary beam? | kVp |
| What equation would be used to solve for a change in SID and/or mAs? | Old mAs / New mAs = Old D^2 / New D^2 |
| An image was obtained utilizing 300 mA, .03 s, 76 kVp, 40" SID, and 1.2 mm focal spot, but you want to repeat the image utilizing 87 kVp and 12:1 grid. What new exposure time must be utilized? | 75 ms |
| In order to obtain radiographic images, what characteristics must the material comprising the front of the imaging plate posses? | Homogenous / Radiolucent |
| What combination of grid ratio and grid frequency provides the best scattered radiation absorption? | High Grid Ratio and Lower Grid Frequency |
| What is the purpose of the electroconductive layer of a CR-PSP plate? | Facilitates transfer through the plate reader |
| What type of relationship do kVp and image contrast posess? | Inverse |
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clairescherle0997
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