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

The ADC converts the analog electrical signal from the detector into a digital format that can be processed by the reconstruction computer.

Question 2

In multi-detector CT, pitch is defined as:

Accepted Answer

Table feed per rotation divided by total beam collimation

Answer

Pitch = table feed per rotation ÷ total beam collimation (detector rows × single detector width), directly affecting dose and image overlap.

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

The anti-scatter grid blocks off-axis scattered radiation produced within the patient from reaching the detectors, improving image contrast.

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

Modern CT tubes use rotating anodes made of tungsten-rhenium alloy to distribute heat over a larger focal track area, allowing sustained high-output scanning.

Question 5

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

Accepted Answer

The total anatomical length imaged per gantry rotation

Answer

Z-axis coverage is the total length along the patient's long axis covered per rotation, determined by the number of detector rows multiplied by individual detector width.

Computed Tomography Test Practice Test

Computed Tomography Test Practice Test

Computed Tomography Test CT Equipment and Technology 2