Hi, If your first projection and your last projections are at the same position, you probably want to use rtksimulatedgeometry --output="geometry.xml" --nproj=721 --arc=360.5 --sdd=553.74 --sid=230.66
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) rtkprojections --path "D:\CT projection\walnut" --output "projections.mha" --regexp .tif --newspacing 0.05 --neworigin -1199.75,-1199.75,0 (the last coordinate of origin is ignored). Simon On Mon, Jul 3, 2023 at 8:10 AM Kim HyunJoon <anslasa...@gmail.com> wrote: > Hello > > I am newbie at RTK and tried to reconstruct 3D cbct dataset of a walnut( > https://zenodo.org/record/6986012) using rtkfdk.exe but > result was not good. > > The script I used is: > > rtksimulatedgeometry --output="geometry.xml" --nproj=721 --arc=360.0 > --sdd=553.74 --sid=230.66 > > rtkprojections --path "D:\CT projection\walnut" --output "projections.mha" > --regexp .tif --newspacing 0.5 > > 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 > > > Metadata describing the measurement geometry and settings for walnut > projection dataset: > > [GENERAL] > ProjectName=20201111_walnut_ > Scanner=University of Helsinki Industrial Mathematics Computed Tomography > Laboratory > Measurers=Alexander Meaney > Date=20201111 > DateFormat=YYYYMMDD > > [GEOMETRY] > GeometryType=Cone > DistanceSourceDetector=553.74 > DistanceSourceOrigin=210.66 > DistanceUnit=mm > > [ACQUISITION] > NumberImages=721 > AngleFirst=0 > AngleInterval=0.5 > AngleLast=360 > > [DETECTOR] > Detector=Hamamatsu Photonics C7942CA-22 > DetectorType=EID > Binning=1x1 > PixelSize=0.050 > PixelSizeUnit=mm > ExposureTime=1000 > ExposureTimeUnit=ms > > [XRAY] > Tube=Oxford Instruments XTF5011 > Target=Mo > Voltage=40 > VoltageUnit=kV > Current=1.0 > CurrentUnit=mA > XRayFilter=None > XRayFilterThickness=N/A > XRayFilterThicknessUnit=mm > > > The output data (fdk.mha) doesn't look very walnut when I open it in > volview (https://volview.kitware.app/). > Some of the parameters seem to be wrong, but I'm not sure where exactly > the problem is. > > I would appreciate it if you could tell me how to solve the problem. > Thank you in advance. > > Ansalsax > > > > > > _______________________________________________ > Rtk-users mailing list > rtk-us...@openrtk.org > https://www.creatis.insa-lyon.fr/mailman/listinfo/rtk-users >
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