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

Dual-source CT uses two X-ray tube/detector systems mounted approximately 90° apart, enabling ultra-fast acquisition and simultaneous dual-energy imaging.

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

The high-voltage generator converts standard AC power into the kilovoltage (80–140 kVp) required by the X-ray tube anode-cathode circuit to produce X-rays.

Question 3

What does 'isotropic resolution' mean in CT imaging?

Accepted Answer

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

Answer

Isotropic resolution means voxels are equal in all three dimensions, allowing high-quality multiplanar reformations in any plane without degradation.

Question 4

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

Accepted Answer

80–140 kVp

Answer

Clinical CT scanners operate at 80–140 kVp, with lower values used for pediatric patients and iodinated contrast studies, and higher values for large patients.

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

Iterative reconstruction models the CT system physics more accurately than FBP, enabling significant noise reduction and allowing dose reduction while maintaining diagnostic image quality.

Computed Tomography Test Practice Test

Computed Tomography Test Practice Test

Computed Tomography Test CT Equipment and Technology 3