18 Questions
What is the relationship between tube current (mA) and image noise in CT imaging?
Tube current and image noise are inversely proportional.
How does increasing the scan time affect image noise in CT imaging?
Increasing the scan time decreases image noise.
What is the relationship between slice thickness and the number of x-rays reaching the detector in CT imaging?
Increasing slice thickness increases the number of x-rays reaching the detector.
How does patient size affect image noise in CT imaging?
Larger patient size increases image noise.
What is the combined effect of tube current and scan time on image noise in CT imaging?
Tube current and scan time have a multiplicative effect on image noise.
Which of the following CT technique factors has the most significant impact on image noise?
Tube current and scan time (mAs)
What effect does increasing slice thickness have on image noise?
Decreases image noise
How does increasing tube voltage (keV) affect image noise?
Decreases image noise
What effect does decreasing tube voltage (keV) have on image noise and contrast?
Increases image noise and decreases contrast
How do patient factors affect image noise?
Larger patients result in more image noise
What is the effect of using a sharp (bone) reconstruction filter on image noise?
Enhances the appearance of image noise
What is the effect of reducing the mAs value on image noise?
Increases image noise
What is the primary cause of image noise in computed tomography (CT)?
Variations in the CT numbers of a uniform material
How is the signal-to-noise ratio (SNR) related to image noise in CT?
A lower SNR indicates less noise in the image
What is the effect of image noise on contrast resolution in CT?
Decreases contrast resolution by hindering the ability to distinguish details
Which factor primarily determines the degree of image noise in CT?
The number of X-ray photons contributing to the image
In CT imaging, what is the conventional average CT number for water?
0
What is the visual manifestation of image noise in CT?
Grainy appearance on the cross-sectional image
This quiz focuses on CT image quality, specifically on understanding image noise in computed tomography. The quiz covers the concept of noise as unwanted changes in pixel values and its impact on image quality.
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