Computed Tomography Test CT Equipment and Technology 2

Question 1

What is the function of the analog-to-digital converter (ADC) in a CT system?

Accepted Answer

To convert the electrical detector signal into digital data for processing

Answer

To amplify the X-ray signal from the tube

Answer

To control the rotation speed of the gantry

Answer

To modulate the tube current based on patient size

Question 2

In multi-detector CT, pitch is defined as:

Accepted Answer

Table feed per rotation divided by total beam collimation

Answer

Number of detector rows times the rotation speed

Answer

X-ray tube current times rotation time

Answer

Detector width divided by reconstruction matrix size

Question 3

What is the role of the post-patient anti-scatter grid in CT?

Accepted Answer

To block scattered radiation from reaching the detectors

Answer

To define slice thickness before the beam enters the patient

Answer

To filter low-energy X-rays from the primary beam

Answer

To align the X-ray beam with the detector array

Question 4

What type of anode is used in modern CT X-ray tubes to manage heat load?

Accepted Answer

Rotating tungsten-rhenium alloy anode

Answer

Stationary tungsten anode

Answer

Stationary molybdenum anode

Answer

Copper-tungsten composite anode

Question 5

What does 'z-axis coverage' refer to in multi-detector CT?

Accepted Answer

The total anatomical length imaged per gantry rotation

Answer

The spatial resolution in the x-y image plane

Answer

The number of projection views acquired per rotation

Answer

The maximum tube voltage achievable

Question 6

What is the purpose of using a 'sharp' (bone) reconstruction kernel in CT?

Accepted Answer

To enhance edge detail and spatial resolution at the cost of increased noise

Answer

To reduce image noise and smooth soft tissue details

Answer

To reduce radiation dose while maintaining image quality

Answer

To eliminate metal artifacts from the image

Question 7

What is the primary goal of automatic tube current modulation (ATCM) in CT?

Accepted Answer

To maintain consistent image noise while minimizing radiation dose

Answer

To increase image sharpness uniformly across the scan

Answer

To speed up gantry rotation during scanning

Answer

To reduce scan time by increasing tube voltage