GXMO Image Quality and Interpretation 2

Question 1

Which artifact appears as a grid-like pattern overlaid on the radiographic image when the grid is not properly aligned with the X-ray beam?

Accepted Answer

Moiré pattern

Answer

A moiré pattern results from misalignment between the grid lines and the scanning frequency, producing an interference pattern on the image.

Question 2

A radiograph shows areas of increased density at the periphery of the image with decreased density at the center. What is the most likely cause?

Accepted Answer

Anode heel effect

Answer

The anode heel effect causes decreased intensity on the anode side and increased intensity on the cathode side, creating uneven density across the image.

Question 3

Which factor primarily determines the recorded detail (sharpness) in a radiographic image?

Accepted Answer

Focal spot size

Answer

A smaller focal spot size reduces geometric unsharpness (penumbra), resulting in sharper recorded detail.

Question 4

When evaluating a chest radiograph, you notice the left hemidiaphragm appears elevated and the mediastinum is shifted to the left. What does this suggest?

Accepted Answer

Left lung collapse (atelectasis)

Answer

Atelectasis (collapse) causes the hemidiaphragm to elevate and shifts the mediastinum toward the affected side due to volume loss.

Question 5

What is the primary purpose of using a high kVp technique in chest radiography?

Accepted Answer

To penetrate the mediastinum and show lung detail simultaneously

Answer

High kVp (120+ kVp) provides sufficient penetration of the dense mediastinum while still showing lung parenchyma, balancing contrast across different tissue densities.

(GXMO) General X-Ray Machine Operator Practice Test

(GXMO) General X-Ray Machine Operator Practice Test

GXMO Image Quality and Interpretation 2