Computed Tomography Test CT Image Quality and Reconstruction 3

Question 1

What type of CT post-processing technique is most useful for evaluating complex vascular anatomy by removing bone from CT angiography data?

Accepted Answer

Maximum Intensity Projection (MIP) after bone subtraction

Answer

Minimum Intensity Projection (MinIP)

Answer

Surface rendering

Answer

Volume averaging

Question 2

Which CT post-processing technique is specifically used to evaluate low-attenuation structures like the airways and lung parenchyma?

Accepted Answer

Minimum Intensity Projection (MinIP)

Answer

Maximum Intensity Projection (MIP)

Answer

Volume Rendering (VR)

Answer

Curved planar reformation (CPR)

Question 3

What is the primary advantage of dual-energy CT (DECT) over single-energy CT?

Accepted Answer

Material decomposition allowing tissue characterization (e.g., uric acid vs. calcium)

Answer

Faster scan acquisition

Answer

Lower radiation dose always

Answer

Better spatial resolution

Question 4

Quantum noise (mottle) in CT images is primarily caused by:

Accepted Answer

Insufficient number of X-ray photons reaching the detectors

Answer

Software reconstruction errors

Answer

Patient motion during the scan

Answer

High tube voltage selection

Question 5

Which CT reconstruction parameter controls the trade-off between image noise and spatial resolution?

Accepted Answer

Reconstruction kernel (filter)

Answer

Matrix size

Answer

Scan field of view

Answer

Gantry rotation speed

Question 6

What artifact appears in cardiac CT when the heart rate is irregular or too fast for the gantry rotation time?

Accepted Answer

Motion artifact causing blurring of cardiac structures

Answer

Ring artifact

Answer

Beam hardening from the spine

Answer

Cupping artifact