[gate-users] Re: [Stir-users] interfile headers for ECAT 953 system

[Qianmei Zhang]

Thank you Claude,

Now i understand why--though i changed the radius of scanner, the 
crystal transverse remained the same. Instead, if i want to change the 
radial bin, i should change the crystal transverse first, then if 
neccessory, change the radius of the scanner in case geometry intersection.

Qianmei

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>Message: 3
>Date: Thu, 25 Nov 2004 18:51:05 +0100
>From: Claude Comtat <comtat at ieee.org>
>Subject: Re: [gate-users]  Re: [Stir-users] interfile headers for ECAT
>	953	system from Gate output
>To: GATE feedback and helpline for Users
>	<gate-users at lphe1pet1.epfl.ch>
>Message-ID: <41A61B89.4070301 at ieee.org>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>Please refer to the GATE user's guide (data output, ECAT7 output, 
>sinogram file):
>
>The radial bin size in the scan sub-header is set to the half-value of 
>the crystal transverse sampling and does not take into account the arc 
>and depth-of-interaction (D.O.I) effects. After arc correction, the 
>radial bin size should be slightly increased to account for the D.O.I. 
>effect (see Figure 10.4). Note that this correction is included in the 
>reconstruction software provided with the ECAT scanners.
>
>Claude
>
>Qianmei Zhang wrote:
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>>Thank you again Kris,
>>
>>I know what you mean. But as long as I define the system of ECAT 953, no 
>>matter how i change the radius of scanner, the bin is always 3.1 mm from 
>>gate output.
>>
>>Another thing is that  I couldn't run ifheaders_for_ecat7 to make 
>>interfile headers that point to the Ecat7 file without changing the bin 
>>sizes to make them match to each other.  That is, ifheaders_for_ecat7 
>>(the version 1.2) may use the Scanner value.
>>
>>Qianmei
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