CT Basic

Question 1

The specific process that accelerates electron in an x-ray tube is:

Answer 1

Application of a voltage

Voltage actually causes electrons to accelerate through the tube.

Question 2

Production of x-rays in a CT machine requires a:

Answer 2

1. source of electrons
2. Means of rapid acceleration of electrons
3. Means of rapid deceleration of electrons

Question 3

If milliamperage (mA) is decreased by a factor of 2, how is the radiation dose to the patient changed if all other factors remain unchanged?

Answer 3

Dose is decreased by a factor of 2

Question 4

Which the following statements correctly describes the flow of electrons through an x-ray tube?

Answer 4

Cathode to anode

Question 5

What technical change is expected to increase the penetrating ability if an x-ray beam?

Answer 5

Increase kilovoltage (KVp)

Question 6

Compared to general radiography, CT x-ray tubes require which of the folowing?

Answer 6

Larger heat capacity

Question 7

An increase of which of the following exposure factors would increase the total number of x-ray photons exposing the detectors?

Answer 7

1. Increased milliamperage (mA)
2. Increased kilovoltage peak (KVp)
3. Increased rotation time

Question 8

If the rotation time of a scan is decreased what other exposure parameter should be changed to maintain the image quality?

Answer 8

Increase milliamperage (mA)

Question 9

Which of the following effects can occur when milliamperage (mA) is increased in CT?

Answer 9

1. Increased dose to the patient
2. Increased beam intensity
3. Increased exposure to the detector elements