RTK/Scripts/ForwardProjection: Difference between revisions
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Note that the original file is in Hounsfield units which explains the negative values in the projection images since, e.g., the attenuation of air is -1000 HU. | Note that the original file is in Hounsfield units which explains the negative values in the projection images since, e.g., the attenuation of air is -1000 HU. | ||
It is also worth of note that the file is oriented in the DICOM coordinate system although RTK uses the 61217 which results in a rotation around the antero-posterior axis of the patient. This can be easily changed by modifying the TransformMatrix in the 00.mhd file. | It is also worth of note that the file is oriented in the DICOM coordinate system although RTK uses the IEC 61217 which results in a rotation around the antero-posterior axis of the patient. This can be easily changed by modifying the TransformMatrix in the 00.mhd file. | ||
Revision as of 12:20, 7 October 2012
This script uses the files [00.mhd] and [00.raw] of the [POPI] as input.
# Create a simulated geometry
rtksimulatedgeometry.exe -n 180 -o geometry.xml
# Forward project
rtkforwardprojections -g geometry.xml -o projections.mha -i 00.mhd --spacing 2 --dimension 512
# Reconstruct in the same resolution as the original
rtkfdk -p . -r projections.mha -o fdk.mha -g geometry.xml --spacing=0.976562,0.976562,2 --origin=-250,-250,-164.5 --dimension=512,512,141
Note that the original file is in Hounsfield units which explains the negative values in the projection images since, e.g., the attenuation of air is -1000 HU.
It is also worth of note that the file is oriented in the DICOM coordinate system although RTK uses the IEC 61217 which results in a rotation around the antero-posterior axis of the patient. This can be easily changed by modifying the TransformMatrix in the 00.mhd file.