Question

1. Processing CT image by unsharp mask enhancement likely increases the:

a. Limiting resolution

b. Visibility of the edges

c. Patient dose

d. Matrix size

e. Image magnification

2. Filtered backprojection is more often used in CT as compared to iterative approaches because:

a) It does not require interpolation, which causes artifacts

b) It’s more accurate than iterative approaches

c) It uses filtering to improve image quality

d) It’s more time efficient than iterative approaches

e) It’s more labor efficient than iterative approaches

Answer 1

1. Processing CT image by unsharp mask enhancement likely to increase
Visibility of edges.

Unsharp masking helps to increase the sharpness of edges.

2. Filtered back projection is a analytic reconstruction algorithm performed to overcome the drawbacks of back projection. It is more often used in CT compared to iterative approaches due to :
It is more time efficient than iterative approach..
This method is highly efficient in terms of implementation and computational efficiency. It is a very popular analytical technique in reconstruction. The accuracy may detoriate   when data in input is noisy or in limited number of projected angle.