ch. 12 ch. 12 ch. 12 Nothing in 400 or 500 Nothing in this column

100

Gases, soft tissue/fat, fluids, muscle, bone
List the 5 types of body tissues in order from lowest density/least partial absorption to highest density/highest partial absorption.

100

As kVp increases, penetration increases, lower contrast, longer gray scale. As kVp decreases, penetration decreases, higher contrast, shorter gray scale.
How does kVp relate to penetration, contrast, and gray scale?

100

Because of their high electron density
Why are atoms with high atomic numbers more likely to absorb x-rays?

100

Photoelectric
Which type of interaction is not occurring at all in soft tissues at 90kVp?
 

200

The atomic number pertains to how densely or loosely packed the electrons are within their given shells.
Describe atomic number

200

Gray
Compton scatter is responsible for what color?

200

It adds equal amount of exposure to all areas of the image.
How does scatter radiation reduce subject contrast?

200

Bone has twice the number of interactions.
Combining the effects of physical density and atomic number of x-ray attenuation, what is the approximate total subject contrast ratio between bone and soft tissue?
 

300

Gases soft tissue fat fluids bone
List the five primary varying tissue atomic numbers that we recognize in the body.

300

Photoelectric effect
Of the three types of x-ray interactions that occur within the patient, which one(s) contribute to subject contrast in the image carried by the remnant beam?

300

cube
Occurrence of the photoelectric effect is inversely proportional the ___________ of the kVp

300

Compton interactions increase
As kVp increases, which way and how much does the occurrence of the Compton effect change?
 

400

The greater the atomic number, the greater the partial absorption.
How does atomic number relate to partial absorption?

400

Tissue density
Of the three aspects of a tissue, which one has a directly proportional relationship to x-ray attention?

400

Compton interactions increase
As kVp is increased, which way does Compton effect change?
   

500

As scatter radiation increases, subject contrast decreases. As scatter radiation decreases, subject contrast increases.
How does scatter radiation relate to subject contrast?

500

Tissue density
Of the three aspects of a tissue, which one must be altered most dramatically to cause a substantive change in subject contrast?

500

overall interactions
Ultimately, the subject contrast in the image carried by the remnant beam is dependent, not upon the raw number of different x-ray interactions, but on their ______ in contributing to the image.
   

Ch. 12

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