[Castor-users] Orientation

[Simon Stute]

Hi Michael,

I am investigating it. There were a few changes in the SPECT system do 
deal with negative angles with the first-and-last angles option.

Are you specifying all angles for each projection, or do you provide the 
first and last angles ?
In the latter case, could you give me the values of these angles and say 
if you specify a detector rotation direction ?

Aside from this, did you try to flip one of the images and do a 
subtraction to see if the attenuation is indeed correctly taken into 
account ?

At least, I can say that this is not just the output that is flipped... 
But you can use option -flip-out to do so if you need to in any 
circomstances.

Thanks for your active contribution !

Best
Simon

Le 26/05/2018 à 09:07, Michael Ljungberg a écrit :
>
> Hi
>
> I wonder if you have made a change in the orientation between version 
> 1 and 2? When I reconstruct the same data and for SPECT with v2, I get 
> the image upside down compared to version 1. If so – do I need to make 
> anything regarding the orientation of the attenuation map or is it 
> only the output that is flipped?
>
> Left version 2 and right version 1
>
> Hälsningar / Best Regards
>
> Michael
>
> *________________________*
>
> *Michael Ljungberg*, PhD, professor
> Department of Medical Radiation Physics
> Lund University
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