[Rtk-users] Help Regarding FDK reconstruction

[ghostcz]

Can you please upload the files again? The content has expired.

L

From: AMJAD N 
Sent: Tuesday, April 19, 2016 1:24 PM
To: louie L ; rtk-users at public.kitware.com 
Subject: Help Regarding FDK reconstruction

Sir, 

I haven't created geometry.xml. My code and data-set are attached in the previous discussion. Also parameters for generating geometry explained in the same thread. I am working without creating geometry.xml but creating geometry in the code itself.

Thanks and Regards,

AMJAD N


On Tue, Apr 19, 2016 at 3:56 PM, louie L <ghostcz at hotmail.com> wrote:

  Can you please send the geometry.xml?

  Louie

  Sent from my iOS 

  Am 19.04.2016 um 12:15 schrieb AMJAD N <amjad.n.cet at gmail.com>:


    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:
          <mailto:CAHq1iunQyc-ZGRH7o6yrMtiwqnusAPnoKzRKPnxm5bpj_3b0%2BA 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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