<div dir="ltr"><div>Hi,</div><div>If your first projection and your last projections are at the same position, you probably want to use </div><div>rtksimulatedgeometry --output="geometry.xml" --nproj=721 --arc=360.5 --sdd=553.74 --sid=230.66</div><div><br></div><div>You indicate  --newspacing 0.5 but your metadata says 0.05? The Hamamatsu Photonics C7942CA-22 seems to have 2400x2400 pixels so you probably want to use (if your detector is well aligned)<br></div><div>rtkprojections --path "D:\CT projection\walnut" --output "projections.mha" --regexp .tif --newspacing 0.05 --neworigin -1199.75,-1199.75,0</div><div>(the last coordinate of origin is ignored).</div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jul 3, 2023 at 8:10 AM Kim HyunJoon <<a href="mailto:anslasax18@gmail.com">anslasax18@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hello<br><br>I am newbie at RTK and tried to reconstruct 3D cbct dataset of a walnut(<a href="https://zenodo.org/record/6986012" target="_blank">https://zenodo.org/record/6986012</a>) using rtkfdk.exe but<br>result was not good.<br><br>The script I used is:<br><br>rtksimulatedgeometry --output="geometry.xml" --nproj=721 --arc=360.0 --sdd=553.74 --sid=230.66<div><br>rtkprojections --path "D:\CT projection\walnut" --output "projections.mha" --regexp .tif --newspacing 0.5</div><div>  <br>rtkfdk -p . -r projections.mha -o fdk.mha -g geometry.xml --spacing 0.05,0.05,0.05 --dimension=128,128,128 --neworigin -64.5,-64.5,0<br><br><br>Metadata describing the measurement geometry and settings for walnut projection dataset:<br><br>[GENERAL]<br>ProjectName=20201111_walnut_<br>Scanner=University of Helsinki Industrial Mathematics Computed Tomography Laboratory<br>Measurers=Alexander Meaney<br>Date=20201111<br>DateFormat=YYYYMMDD<br><br>[GEOMETRY]<br>GeometryType=Cone<br>DistanceSourceDetector=553.74<br>DistanceSourceOrigin=210.66<br>DistanceUnit=mm<br><br>[ACQUISITION]<br>NumberImages=721<br>AngleFirst=0<br>AngleInterval=0.5<br>AngleLast=360<br><br>[DETECTOR]<br>Detector=Hamamatsu Photonics C7942CA-22<br>DetectorType=EID<br>Binning=1x1<br>PixelSize=0.050<br>PixelSizeUnit=mm<br>ExposureTime=1000<br>ExposureTimeUnit=ms<br><br>[XRAY]<br>Tube=Oxford Instruments XTF5011<br>Target=Mo<br>Voltage=40<br>VoltageUnit=kV<br>Current=1.0<br>CurrentUnit=mA<br>XRayFilter=None<br>XRayFilterThickness=N/A<br>XRayFilterThicknessUnit=mm<br><br><br>The output data (fdk.mha) doesn't look very walnut when I open it in volview (<a href="https://volview.kitware.app/" target="_blank">https://volview.kitware.app/</a>).<br>Some of the parameters seem to be wrong, but I'm not sure where exactly the problem is.<br><br>I would appreciate it if you could tell me how to solve the problem.<br>Thank you in advance.<br><br>Ansalsax<br><br><br><br><br><br></div></div>
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