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RADT465 Direct Study

Unit 3- Image Acquisition and Evaluation

QuestionAnswer
What are the four radiographic qualities? Density, contrast, recorded detail, and distortion (Wallace, p. 4)
Overall blackness of a radiograph Density (Wallace, p.4)
What is the difference between adjacent densities on a radiograph? Contrast (Wallace, p. 5)
_______ _______ is the sharpness of the lines of the image. Recorded detail (Wallace, p. 5)
This is the misrepresentation of the true size and shape of the image as compared to the object. Distortion (Wallace, p. 5)
List the two photographic properties. Density and contrast (Wallace, p. 4)
List the two geometric properties. Distortion and recorded detail (Wallace, p. 4)
The controlling factor for density is _______. The controlling factor for contrast is__________. mAs; kVp (Wallace, p. 6)
What is the two ways a radiographer can reduce magnification? Short OID, long SID (Wallace, p. 28)
What is also known as focus-film distance? SID (Wallace, p. 34)
______ _______ is the misrepresentation of the true shape of the image as compared to the object. Shape distortion (Wallace, p. 36)
This occurs when the object is angled, but the central ray remains perpendicular to the film? Foreshortening (Wallace, p. 38)
This occurs when the object is parallel to the film, but the central ray is angled? Elongation (Wallace, p. 44)
______ ______ occurs when two objects normally superimposed, but appear as separate structures due to an angle of the central ray. Spatial distortion (Wallace, p. 44)
List the two exposure factors that directly control radiographic density and quantity of x-rays. mA and exposure time (Wallace, p. 48)
______ represents the total quantity of x-rays produced in a beam. mAs (Wallace, p. 53)
mAs has a ______ relationship in density on the radiograph. Direct (Wallace, p. 54)
This reduces the chance of motion blur? Short time (Wallace, p. 59)
What size focal spot improves recorded detail? Small focal spot (Wallace, p. 59)
What can the radiographer use to create a breathing technique? Low mA and long time (Wallace, p. 60)
What is the current in the x-ray tube at the time of exposure? mA (Wallace, p. 62)
What determines how long the mA will be working? Exposure time (Wallace, p. 62)
What does the reciprocity law state? Two different sets of mA and time selections can produce the same mAs (Wallace, p. 62)
This states the intensity of radiation is inversely proportional to the square of the distance from the source of radiation. The Inverse Square Law (Wallace, p. 64)
If the SID is doubled, radiation intensity becomes_____ times less. 4 (Wallace, p. 66)
If the SID is cut in half, the radiation intensity becomes _____ times greater. 4 (Wallace, p. 66)
How will a high contrast image appear? Black and white (Wallace, p. 75)
How will a low contrast image appear? Many shades of gray (Wallace, p. 75)
Short scale is _____ contrast. Long scale is _____ contrast. High; low (Wallace, p. 75)
What is the atomic number of iodine? 53 (Wallace, p. 80)
What is the atomic number of barium? 56 (Wallace, p. 80)
List three most common types of contrast. Air, barium, iodine (Wallace, p. 80)
What contrasts are used for the GI tract? Air and barium (Wallace, p. 80)
What type of contrast would a radiographer use for kidneys or gallbladder? Iodine (Wallace, p. 80)
What is caused by the composition of the patient’s body parts? Subject contrast (Wallace, p. 85)
What can be used to increase subject contrast? Contrast media (Wallace, p. 85)
Scatter radiation ______ radiographic contrast. Reduces (Wallace, p. 86)
Optimum kVp for small extremities 55-60 (Wallace, p. 89)
Optimum kVp for large extremities 65-70 (Wallace, p. 89)
Optimum kVp for skull, CXR w/o grid, spine 80 (Wallace, p. 89)
Optimum kVp for ABD with barium 110 (Wallace, p. 89)
Optimum kVp for ABD w/o barium, ribs, shoulder, pelvis and hip 70 (Wallace, p. 89)
Created by: lawebster