How to get the ODD with fanbeam function

Hello dear community.

I have applied a fanbeam projection to a circular phantom image (Z) using the fanbeam function. I have specified FDD with 'Distance_Rotachse' (D in Mathworks Documentation).

How can I read out the associated ODD? Does anyone know how the fanbeam function determines the ODD?

Here is a part of my code:

...(Definition of Z, Distance_Rotachse,...)

F=fanbeam(Z,Distance_Rotachse,'FanRotationIncrement',0.1,'FanSensorGeometry','line');
figure
imshow(Z)
title('Phantom')
figure 
imshow(F)
title('Radontransform of Phantom')

Thank you,

Greetings

Answer 1

[Matt J]

I suspect ODD is always zero. It should be easy to test. Use the known width of the phantom and the known FanSensorSpacing to see if the magnification equals 1.

As a side note, I do not recommend that you use fanbeam(), as it is very primitive, and doesn't seem to be linear. I recommend that you use TIGRE's implementation instead.