FREE RADIOLOGY AND STUDY GAMES ABOUT CHAP 6

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FREE RADIOLOGY AND STUDY GAMES ABOUT CHAP 6

IMAGING1 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -36 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: What is the line focus principle?

Answer:

when the target angle is less than 45 degrees, the effective focal spot is smaller than the actual focal spot.

Question 2: When does cracking of the anode commonly occur?

Answer:

When it hasn't been warmed up.

Question 3: What is the rotor made of?

Answer:

Copper cylinder witha molybdenum stem.

Question 4: Describe the space charge effect and where it takes place.

Answer:

The focusing cup has a negative charge, so the electrons of the thermionic cloud are repelled because of their negative charge. The electrons fall back onto the filament while others jump off.

Question 5: What are the functions of the anode assembly?

Answer:

Target surface, conducts high voltage, primary thermal conductor.

Question 6: The focusing cup has what charge?

Answer:

negative.

Question 7: What charge is the cathode?

Answer:

Negative.Question 8: The use of the line-focus principle causes a problem known as the ____ effect?

Answer:

anode heel effect.

Question 9: Length of envelope?

Answer:

10"

Question 10: What is the most common target angle?

Answer:

12 degrees

Question 11: What is the envelope made of?

Answer:

Glass or metal.

Question 12: When does melting of the anode commonly occur?

Answer:

When the rotor or stator stops spinning.

Question 13: What does the focusing cup do?

Answer:

Compresses the thermionic cloud, houses the filament.

Question 14: What are the purposes of the housing?

Answer:

Control leakage and scatter radiation, isolate high voltage, provide means to cool tube.

Question 15: Describe the anode heel effect.

Answer:

The anode side of the tube has less radiation intensity than the cathode side, about 30-40%.

Question 16: What is outside of the envelope?

Answer:

Stator.

Question 17: What controls the effective and actual focal spot sizes?

Answer:

The effective spot is controlled by the actual focal spot, which is determined by the length of the filament.

Question 18: Calc of heat units.

Answer:

HU = kVp x mA x time

Question 19: What is important about focal spot sizes?

Answer:

The effective focal spot is important for recorded detail. The smaller, the better image. We need a large actual focal spot to help control heat.

Question 20: What affects the production of a thermionic cloud?

Answer:

Filament diameter, length, and temp.

Question 21: Describe the relationship between the stator and rotor.

Answer:

When the stator is energized the rotor turns.

Question 22: The advantage of a high speed rotor is what?

Answer:

Dissipates heat better.

Question 23: What is the Cathode assembly's main purpose?

Answer:

To create a thermionic cloud.

Question 24: What is the charge of the focusing cup?

Answer:

Negative.

Question 25: The components of the anode assembly are?

Answer:

Anode, stator, rotor.

Question 26: Focusing cup is made of what?

Answer:

Nickel.

Question 27: What is the housing made of?

Answer:

Lead-lined cast steel.

Question 28: What is off focus radiation?

Answer:

Photons that are not produced at the focal spot are "off focus" or "extra focal"