FREE AND STUDY GAMES ABOUT VARKEY CHAPTER 10 SG

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FREE AND STUDY GAMES ABOUT VARKEY CHAPTER 10 SG

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -69 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: What is the relation between the scale of contrast and latitude?

Answer:

Wider latitude = less contrast (longer gray-scale), narrower latitude = greater contrast (shorter gray-scale) Question 2: Define density:

Answer:

Overall blackening of an image due to exposure of the silver in the emulsion

Question 3: What is the range of base plus fog density?

Answer:

0.1-0.3 OD

Question 4: What causes foreshortening and how can you reduce it?

Answer:

Reduce angle of inclination of part from IR. Place part to central part of beam (lateral deviation from central axis increases foreshortening)

Question 5: Name the factors that control/affect detail.

Answer:

-motion/geometric blur - focal spot size

-SID/OID

Question 6: If the image of an object is smaller than the object, the image is said to be

Answer:

foreshortened

Question 7: Define noise

Answer:

random fluctuation in OD of the image

Question 8: How kVp affect contrast on an image?

Answer:

Higher kVp = lower contrast, lower kVp = greater contrast

Question 9: Low kVp produces______ -scale contrast

Answer:

short

Question 10: What is Quantum Mottle? How does it appear on the image?

Answer:

The random nature by which x-rays interact with the IR. Image produced with few x-rays has high quantum mottle, image produced with low number x-rays has low quantum mottle.

Question 11: What are the factors that affect magnification?

Answer:

SID and OID

Question 12: Latitude and contrast are _______ proportional

Answer:

Inversely

Question 13: What are the factors that affect contrast resolution ?

Answer:

Compression (improves spatial resolution and patient dose as well), kVp, filtration

Question 14: What is contrast resolution?

Answer:

-Visibility of detail Ability to distinguish anatomical structures of similar subject contrast Question 15: If two characteristic curves are given to you, how will you identify the one that has long scale contrast?

Answer:

Long-scale contrast corresponds to less slope, wider latitude

Question 16: How can you reduce noise?

Answer:

Reduce quantum mottle by using high mAs, low kVp, and a slower IR.Question 17: If two characteristic curves are given to you, how would you identify the one that has more contrast?

Answer:

The curve with the steeper slope has a higher contrast Question 18: What are the three Principal Geometric factors that affect radiographic quality?

Answer:

Magnification, Distortion, and Focal-spot blur Question 19: When creating a sensitometric curve what is plotted on the X-axis and on the Y-axis?

Answer:

-Log relative exposure on x-axis -optical density (OD) on y-axis.

Question 20: Film contrast is related to the

Answer:

range of optical density (slope) of the straight-line portion part of the characteristic curve.

Question 21: Define contrast

Answer:

kVp, shades of gray. IR contrast x subject contrast = radiographic contrast Question 22: Name two other terms that can be used instead of spatial resolution.

Answer:

-detail -recorded detail Question 23: Motion blur will be more visible when using_____ SID (long or short?)

Answer:

short (Large SID less motion blur )

Question 24: What are the factors that affect spatial resolution?

Answer:

Motion blur, geometric blur, and screen blur

Question 25: What is Quantum Mottle? How does it appear on the image?

continued...

Answer:

Less quantum mottle produces smoother x-rays, more produces less smooth x-rays.Quantum mottle caused by low mAs. To fix higher mAs, low kVp.

Question 26: _______is the most important influence on subject contrast

Answer:

Kvp Question 27: What is the diagnostically useful density range for a radiographic image?

Answer:

OD range 0.25-2.5