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FREE RADIOLOGY AND STUDY GAMES ABOUT CH 10
IMAGE QUALITY EXAM QUESTIONS
Qs and Ans Expert- Explanation
This Exam contains:
-Guarantee passing score -86 Questions and Answers -format set of multiple-choice -Expert- Explanation Question 1: _____ is a reduction is image size; related to the angle of inclincation of the object.
Answer:
Forshortening Question 2: Fast image receptors have ___ noise and ____ spatial resolution and ___ contrast resolution.
Answer:
high; low; low Question 3: Contrast media are effective because they accentuate subject contrast through _____ absorption.
Answer:
photoelectric Question 4: A low kVp results in high subject contrast, sometimes called ___ gray scale.
Answer:
short (few shades of gray)
Question 5: Radiographic contrast formula?
Answer:
Radiographic contrast = IR contrast x subject contrast
Question 6: ____ is the most important influence of subject contrast.
Answer:
kVp Question 7: The degree of subject contrast is ______ proportional to the relative number of x-rays leaving those sections of the body.
Answer:
directly Question 8: Use of intensifying screens decreases patient dose by a factor of ___.
Answer:
20 Question 9: The reciprocity law fails for screen-film exposures at exposure times less than approximately ___ ms or longer than ___ seconds.
Answer:
10; 2
Question 10: Base plus fog OD has a range of approximately ___ to ___.
Answer:
0.1; 0.3
Question 11: _____ refers to the degree of sharpness of structural lines on a radiograph.
Answer:
Detail (recorded detail)
Question 12: Focal spot blur is decreased when ___ is decreased.
Answer:
OID
Question 13: High spatial resolution and high contrast resolution require ___ noise and slow image receptors.
Answer:
low Question 14: The contrast of a radiograph viewed on an illuminator is called ____ contrast.
Answer:
radiographic Question 15: ____-____ blur is the blurred region on the radiograph which the technologist has littl control.
Answer:
Focal-spot (occurs because the focal spot is not a point)
Question 16: ____ density is the OD that is inherent in the base of the film.
Answer:
Base (value of 0.1) Question 17: The focal-spot blur is ____ on the anode side and ____ on the cathode side of the image.
Answer:
small;large Question 18: The ability of an IR to respond to a low x-ray exposure is a measure of its _____.
Answer:
speed (or sensitivity) Question 19: Focal spot blur is the most important factor for determining _____ _____.
Answer:
spatial resolution Question 20: The characteristic curve is a digital representation between ___ and ______.
Answer:
OD; exposure
Question 21: Thick objects are more ____ than thin objects.
Answer:
distorted
Question 22: Four factors that may affect the finished radiograph?
Answer:
concentration of processing chemicals, degree of chemistry agitatoin during development, development time/temperature Question 23: The high atomic numbers of iodine(53) and barium(56) result in ____ subject contrast.
Answer:
increased
Question 24: What is the magnification factor formula?
Answer:
MF=Image size/object size
MF=SID/SOD
Question 25: What are the three interrelated characteristics of radiographic quality?
Answer:
resolution, noise and speed Question 26: Film contrast is related to the ___ of the straigh line portion of the chacteristic curve.
Answer:
slope (a curve with a greater slope will have greater contrast) Question 27: Most radiographic IR's have an average gradient in the range of ___ to ___.
Answer:
2.5; 3.5
Question 28: As kVp is increased, both the ____ and ____ of radiation are increased.
Answer:
quantity; quality
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