[Rtk-users] Help Regarding FDK reconstruction

[AMJAD N]

Sir,

sdd and sid is measured from the experiment setup.
-0.5*spacing*(size-1) logic is applied and effect is same.

The parameters we know are described below. Please go through it and help
me tackle this issue.

Number of projections: 50

Object size:
x = 9.924236 mm
y = 8.3048 mm
z = 10.505572mm

Detector panel:
flat panel : Width: 1032 px., Height: 1012 px.
Width: 51.6mm Height: 50.6mm
(Detector pixel pith: 0.05mm)

Source to Detector Distance = 459.154 mm
Source to object axis distance = 95.331mm

Direction of rotation: clock-wise

Angle
start: 0 degrees
increment: 7.2 degrees
total: 360 degrees

Thanks and Regards.
AMJADN

On Tue, Apr 19, 2016 at 11:32 AM, Simon Rit <simon.rit at creatis.insa-lyon.fr>
wrote:

> Dear Amjad,
> I had a quick look at your dataset. For sure, it's a geometry problem. Do
> you have any information regarding the geometry? How did you obtain sdd /
> sid?
> Currently, I can see that you have set the projections and the volume
> origin to 0,0,0 which is not correct, you probably want to center them for
> a first test. If you want to center them, the formula to compute the origin
> is -0.5*spacing*(size-1) for each corrdinate.
> Simon
>
>
> On 18/04/2016 08:50, AMJAD N wrote:
>
> Hi, The data set is reattached below,. Someone please look into it and
> help me please,
>
> http://filenurse.com/download/bb2827a35cc99a14feee17d2c37cdf76.html
>
> Thanks in advance
> AMJAD
>
>>
>> Message: 1
>> Date: Thu, 14 Apr 2016 17:21:12 +0530
>> From: AMJAD N <amjad.n.cet at gmail.com>
>> To: rtk-users at public.kitware.com
>> Subject: [Rtk-users] Help Regarding FDK reconstruction
>> Message-ID:
>>         <
>> CAHq1iunQyc-ZGRH7o6yrMtiwqnusAPnoKzRKPnxm5bpj_3b0+A at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Hi
>>
>> I am new to RTK. and I have been looking into it for the past two weeks..I
>> think its an amazing tool..
>>
>> My problem is:
>>
>>
>> I have a set of 50 raw CT scan projections of an industrial fin as shown
>> (fin.jpg)
>> I am reading it using ImageSeriesReader with RawimageIO and been have
>> trying to reconstruct it using FDKConeBeamReconstructionFilter. Its been
>> almost a week that I am trying this,but
>> I could not reconstruct it correctly
>> I tried varying my geometry, origin, spacing etc ..but still no hope
>>
>> Can u please look into my program(finRecon.txt) and the current output I
>> am
>> getting is output_fin.mha , which is incorrect and  suggest some help
>>
>>  The link to my dataset:
>>
>> http://expirebox.com/download/b523394ea63c635d10171a69e687993b.html
>>
>> raw image dimensions : 1032 *1012
>> raw image                     16 bit
>> current spacing:            0.05 0.05 0.05
>> origin:                           0 0 0
>> step angle                     7.2 degrees
>>
>>
>> Thanks in advance,
>>
>> AMJAD
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