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

[Mutanga Theodore]

Hello Zhang, what are you modelling , what kind of scanner ?


> 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
>
>>
>>
>>------------------------------
>>
>>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:
>>
>>
>>
>>>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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