CT image artifacts

What is the main cause of beam hardening artifacts in CT imaging?

• Inadequate collimation

• Overexposure of the detector

• Scattering of X-rays

• Preferential absorption of lower-energy photons

How can metallic artifacts be reduced in CT images?

• Applying a sharpening filter to the images

• Using metal artifact reduction techniques such as iterative reconstruction algorithms, dual-energy CT scanning, and metal artifact reduction software.

• Using water instead of contrast dye

• Increasing the exposure time

What is the primary reason for motion artifacts in CT scans?

• External interference

• Patient movement

• Incorrect calibration

• Equipment malfunction

What are streak artifacts in CT imaging and how do they affect image quality?

• Streak artifacts are caused by low attenuation materials, leading to complete data acquisition and appearing as dark streaks on the image.

• Streak artifacts are caused by high attenuation materials, leading to incomplete data acquisition and appearing as bright streaks on the image.

• Streak artifacts are caused by software errors, resulting in a pixelated image with no streaks visible.

• Streak artifacts are caused by motion artifacts, resulting in a blurry image with no streaks present.

Explain the concept of ring artifacts in CT images.

• Ring artifacts in CT images are caused by the non-uniform response of the detector elements.

• Ring artifacts in CT images are caused by the scanner being too new.

• Ring artifacts in CT images are caused by the patient moving during the scan.

• Ring artifacts in CT images are caused by the uniform response of the detector elements.

How can noise artifacts be minimized in CT imaging?

• By using outdated equipment

• By increasing the exposure time

• By not calibrating the scanner

• By increasing the number of projections, using appropriate filtration techniques, optimizing scanning parameters, and employing advanced reconstruction algorithms.

What is the impact of beam hardening artifacts on CT image quality?

• Beam hardening artifacts improve CT image quality by enhancing contrast resolution

• Beam hardening artifacts have no impact on CT image quality

• Beam hardening artifacts reduce noise in CT images

• Beam hardening artifacts can degrade CT image quality by reducing contrast resolution and introducing inaccuracies in Hounsfield unit measurements.

Describe the appearance of metallic artifacts in CT scans.

• Bright streaks or blobs

• Dark shadows

• Fuzzy outlines

• Colorful patterns

What are some common sources of motion artifacts in CT imaging?

• Temperature changes

• External vibrations

• Light exposure

• Patient motion, respiratory motion, cardiac motion, bowel peristalsis, involuntary muscle movements

How do streak artifacts appear in CT images and what causes them?

• Streak artifacts in CT images appear because of software glitches

• Streak artifacts in CT images are caused by pixel saturation

• Streak artifacts in CT images are due to motion artifacts

• Streak artifacts appear in CT images due to high attenuation materials causing the beam hardening effect.