Computed Tomography Test CT Equipment and Technology 3

Question 1

What defines a 'dual-source' CT scanner?

Accepted Answer

A system with two X-ray tube and detector array pairs offset at approximately 90°

Answer

A system with two separate patient tables

Answer

A scanner capable of imaging two patients simultaneously

Answer

A system using two different X-ray energies from a single tube

Question 2

What is the primary function of the high-voltage generator in a CT system?

Accepted Answer

To supply stable high voltage (kVp) to the X-ray tube for X-ray production

Answer

To power the patient table movement mechanism

Answer

To control the rotational speed of the gantry

Answer

To process raw detector data into CT images

Question 3

What does 'isotropic resolution' mean in CT imaging?

Accepted Answer

Equal spatial resolution in all three dimensions (x, y, and z)

Answer

Resolution that is equal across all CT scanner models

Answer

Uniform image noise throughout the scan volume

Answer

Equal X-ray attenuation in all tissue types

Question 4

What is the typical kilovoltage peak (kVp) range used in routine clinical CT scanning?

Accepted Answer

80–140 kVp

Answer

40–60 kVp

Answer

200–300 kVp

Answer

150–200 kVp

Question 5

What is the primary advantage of iterative reconstruction over filtered back projection (FBP) in CT?

Accepted Answer

Reduced image noise at a given radiation dose level

Answer

Faster image reconstruction processing time

Answer

Greater spatial resolution for all tissue types

Answer

Complete elimination of beam hardening artifacts

Question 6

In CT imaging, what does the term 'image noise' primarily refer to?

Accepted Answer

Random variation in CT numbers (HU) across a uniform object

Answer

Artifacts caused by patient motion during scanning

Answer

Blurring caused by insufficient spatial resolution

Answer

Distortion caused by metallic implants in the patient

Question 7

In CT scanner design, what is the 'focal spot' of the X-ray tube?

Accepted Answer

The small area on the anode where electrons strike and X-rays are produced

Answer

The area of the detector that receives the highest X-ray intensity

Answer

The center point of the reconstruction matrix

Answer

The region of patient tissue receiving the highest dose