Module 9 - Week 13 Flashcards
What is exposure?
The amount of radiation reaching the image receptor.
What is dose?
The amount of radiation absorbed by the patient.
How are exposure and dose related?
Higher exposure usually increases dose; balance is needed for safety and quality.
How does dose affect image quality?
Higher dose reduces noise and improves contrast but increases patient risk.
Why is exposure optimization important?
To achieve good image quality while minimizing radiation dose.
How can you tell if image quality is good?
By checking exposure index, noise levels, contrast, spatial resolution, and artifacts.
What does high noise indicate?
Insufficient exposure, reducing image clarity.
What is contrast resolution?
The ability to differentiate similar tissues.
What is spatial resolution?
The ability to see fine details in an image.
What is image noise?
Unwanted graininess caused by low exposure or electronic interference.
What is dynamic range?
The range of gray shades an image can display.
How can you improve image quality?
Adjust exposure factors, reduce noise, and use post-processing.
What happens if mAs is too low?
The image will have excessive noise (quantum mottle).
What does increasing kVp do?
Improves penetration but may lower contrast.
What are key steps in image processing?
Image acquisition, processing, display adjustments, and artifact management.
Why is artifact control important?
Artifacts can reduce image clarity and mislead diagnoses.
How can a technologist improve image quality?
By optimizing exposure, positioning correctly, and adjusting post-processing.
Why is equipment calibration important?
It ensures consistent, high-quality imaging.
How does collimation help?
It reduces unnecessary radiation and enhances image clarity.
