Which technique helps reduce motion artifacts during chest CT?

Which technique helps reduce motion artifacts during chest CT?

• A. Increased scan time to allow patient rest.
• B. Breath-hold guidance.
• C. No patient instruction.
• D. Lower radiation dose without timing.

Answer: (B)

Controlling respiration during chest CT to keep the chest still is the key idea. Guiding the patient to hold their breath during the scan stops the movement of the chest wall, diaphragm, and heart, so the anatomy stays in a single position while the images are acquired. That sharpens the data and reduces blur and misregistration, which are the motion artifacts you’re trying to avoid. In practice, an inspiration breath-hold is commonly used because it provides a stable, expanded lung volume and minimizes diaphragmatic motion, yielding clearer images of the lungs and mediastinum. Other approaches don’t address the motion as directly. Extending the scan time can actually allow more opportunity for movement or patient drift; giving no instructions leads to unpredictable breathing and more blur; lowering radiation dose without timing or gating doesn’t fix motion and can degrade image quality with more noise. Breath-hold guidance targets the motion itself, making it the most effective technique.

Controlling respiration during chest CT to keep the chest still is the key idea. Guiding the patient to hold their breath during the scan stops the movement of the chest wall, diaphragm, and heart, so the anatomy stays in a single position while the images are acquired. That sharpens the data and reduces blur and misregistration, which are the motion artifacts you’re trying to avoid. In practice, an inspiration breath-hold is commonly used because it provides a stable, expanded lung volume and minimizes diaphragmatic motion, yielding clearer images of the lungs and mediastinum.

Other approaches don’t address the motion as directly. Extending the scan time can actually allow more opportunity for movement or patient drift; giving no instructions leads to unpredictable breathing and more blur; lowering radiation dose without timing or gating doesn’t fix motion and can degrade image quality with more noise. Breath-hold guidance targets the motion itself, making it the most effective technique.