Computed Tomography 3

Question 1

What is spatial resolution ?

Answer 1

Spatial resolution is the ability to tell apart structures that differ in density

Question 2

What is contrast resolution?

Answer 2

Contrast resolution is the ability of the scanner to tell apart smaller differences in attenuation to allow us to tell apart similar tissues

Question 3

What is signal to noise ratio?

Answer 3

SNR compares the levels of desired signals on a image to the level of background noise

Question 4

What effect does increasing KVP have on Spatial resolution , SNR and radiation dose?

Answer 4

Increasing KVP decreases spatial resolution but increases SNR and radiation dose

Question 5

What effect does decreasing mAs have on spatial resolution, SNR and radiation dose?

Answer 5

Decreasing mAs increases spatial resolution but decreases SNR and radiation dose

Question 6

What effect does decreasing slice thickness have on spatial resolution, SNR and radiation dose?

Answer 6

Decreasing the slice thickness decreases the SNR and increases Spatial resolution and radiation dose

Question 7

What effect does increasing the matrix have on spatial resolution, SNR and radiation dose?

Answer 7

Increasing the matrix increases the spatial resolution and decreases the SNR but has no effect on radiation dose

Question 8

What effect does decreasing the field of view have on spatial resolution, SNR and radiation dose?

Answer 8

Decreasing the field of view increases the spatial resolution and decreases the SNR but has no effect on radiation dose

Question 9

What effect does increasing pitch have on spatial resolution, SNR and radiation dose?

Answer 9

Increasing the pitch decreases all of them