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Questions and Answers
What is the main difference between CT imaging and conventional radiography?
What is the main difference between CT imaging and conventional radiography?
- CT imaging generates a matrix of intensities, while conventional radiography forms an image directly on the image receptor. (correct)
- CT imaging creates a 3D image, while conventional radiography creates a 2D image.
- CT imaging uses x-rays to form an image, while conventional radiography uses a different type of radiation.
- CT imaging creates an image directly on the image receptor, while conventional radiography uses data received to depict relative attenuation of x-rays.
What property of a tissue determines its x-ray attenuating ability?
What property of a tissue determines its x-ray attenuating ability?
- The energy of the x-ray photon
- The tissue's thickness
- The tissue's molecular structure
- The tissue's density (correct)
What is the relationship between a tissue's attenuation coefficient (μ) and the number of photons that reach the detector?
What is the relationship between a tissue's attenuation coefficient (μ) and the number of photons that reach the detector?
- The higher the μ value, the higher the number of photons that reach the detector.
- The relationship between μ and the number of photons is not mentioned in the text.
- The μ value does not affect the number of photons that reach the detector.
- The higher the μ value, the lower the number of photons that reach the detector. (correct)
What is the purpose of the image reconstruction process in CT imaging?
What is the purpose of the image reconstruction process in CT imaging?
How does the attenuation coefficient (μ) of a tissue vary?
How does the attenuation coefficient (μ) of a tissue vary?
What is the relationship between a tissue's density and its attenuation coefficient (μ)?
What is the relationship between a tissue's density and its attenuation coefficient (μ)?
What is the main advantage of back-projection in CT image reconstruction?
What is the main advantage of back-projection in CT image reconstruction?
Why is back-projection not commonly used in clinical CT?
Why is back-projection not commonly used in clinical CT?
What does the filtered back-projection method aim to remove from CT images?
What does the filtered back-projection method aim to remove from CT images?
Why does filtered back-projection require higher radiation doses compared to other methods?
Why does filtered back-projection require higher radiation doses compared to other methods?
Which aspect limits the spatial resolution in filtered back-projection?
Which aspect limits the spatial resolution in filtered back-projection?
What is a major disadvantage of the filtered back-projection method in CT imaging?
What is a major disadvantage of the filtered back-projection method in CT imaging?
In filtered back-projection, what happens when the negative and positive components are canceled?
In filtered back-projection, what happens when the negative and positive components are canceled?
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