What is the difference between a fan beam helical CT and a cone beam helical CT?

Question

What is the difference between a fan beam helical CT and a cone beam helical CT? What are the advantages of cone beam helical CT over fan beam helical CT. Calculate the CT number of blood with the following given data. Absorption coefficients of a body slice are given in the form of the following matrix. Perform the back project and calculate the background (bg) and the normalization number (n). CT number of liver is 60. Find the CT number of another tissue whose contrast with liver is 2. A matrix representing a wide body slice is given by the matrix below.

Explanation / Answer

1.a.Fan beam helical CT uses fan shaped X ray beam while cone beam helical CT uses cone shaped X ray beam.Fan beam helical CT poduces one slice of image in one scan while cone beam helical CT produces the complete image in one scan.

Advantages of cone beam helical CT over fan beam helical CT are:

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