FREE RADIOLOGY AND STUDY GAMES ABOUT STACK

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FREE RADIOLOGY AND STUDY GAMES ABOUT STACK

#132647 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -73 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: What is the enlargement of the recorded image as compared to the actual size of the structure?

Answer:

magnification

Question 2: What is the ability to image an object with accuracy?

Answer:

resolution also called recorded detail Question 3: What term means the misrepresentation of the size or shape of a structure recorded in the radiographic image?

Answer:

distortion

Question 4: How can a radiographer reduce motion blur?

Answer:

Use the shortest possible exposure time; give proper breathing instructions; use restraining devices; use a large SID; use a small OID

Question 5: What is the absorption of x-rays in the heel of the anode which results in decreased x-ray intensity of the anode side of the central ray?

Answer:

heel affect

Question 6: How does the focal spot size affect recorded detail?

Answer:

There is an increase in recorded detail as focal spot size decreases

Question 7: What are the two types of distortion?

Answer:

size and shape Question 8: What is the rate at which x-ray energy is transformed into light in an intensifying screen?

Answer:

conversion efficiency Question 9: What is the enlargement of the recorded image as compared to the actual size of the structure?

Answer:

size distortion Question 10: What is the misrepresentation (elongated or foreshortened) of the shape of the structure recorded as compared to the actual shape of the structure?

Answer:

shape distortion

Question 11: What effect does halving the SID have on density?

Answer:

Density is increased 4 times

Question 12: What influences image receptor (film) contrast?

Answer:

Characteristics of the film and processing

Question 13: What formula is used to calculate size distortion?

Answer:

MF = SID/SOD (MF=magnification factor) Question 14: What is the loss of radiographic quality caused by movement of the patient or x-ray tube during exposure?

Answer:

motion blur Question 15: What is the ratio of light incident on the film to amount of light transmitted through the film?

Answer:

radiographic density (optical density)

Question 16: How does SID affect recorded detail?

Answer:

SID is directly proportional to recorded detail. As SID increases, recorded detail increases and vice versa. This is because shorter SID's causes an increase in magnification, thus causing a decrease in recorded detail

Question 17: How does KVP relate to differential absorption?

Answer:

Differential absorption increases as the KVP is decreased; conversely, as KVP increases, more photons pass through and differential absorption decreases Question 18: What is the imperfect unsharp shadow caused by size of the focal spot (replaces the terms penumbra and geometric unsharpness)?

Answer:

focal spot blur Question 19: What is the overall blackening of the film from the black metallic silver deposited in the emulsion?

Answer:

radiographic density (optical density)

Question 20: Which scale of contrast has many shades of gray?

Answer:

Long scale (low contrast)

Question 21: What effect does doubling the SID have on density?

Answer:

Density is reduced to 1/4

Question 22: What are some alternate terms for resolution?

Answer:

detail, sharpness, definition and resolving power Question 23: Changing peak KVP by what percentage will have the same effect on density as doubling the MAS or halving the MAS?

Answer:

15%

Question 24: What factors cause elongation of an object?

Answer:

misalignment of the tube or film Question 25: What refers to the random nature in which x-rays interact with image receptor and occurs with the use of high speed screens with very low mas and high KVP and causes a grainy appearance of the image?

Answer:

quantum mottle Question 26: What is different degrees of absorption in adjacent tissues that result in image contrast?

Answer:

differential absorption

Question 27: How does mas affect contrast?

Answer:

Mas alters density of image and therefore affects contrast