[Rtk-users] .dat to .mha image

[MORY, CYRIL]

Hi Laura,

In the .mhd and .raw format, the .raw file is a binary file of floats (or whatever) representing the pixel intensities, and the .mhd a simple header that indicates the number of dimensions, the size in pixels along each dimension, ... Your .dat seems to be exactly the same as the .raw
You can create the .mhd header yourself, using a text editor. Here is an example :

ObjectType = Image
NDims = 2
BinaryData = True
BinaryDataByteOrderMSB = False
CompressedData = False
TransformMatrix = 1 0 0 1
Offset = -190.5 -190.5
CenterOfRotation = 0 0
ElementSpacing = 3 3
DimSize = 128 128
ElementType = MET_FLOAT
ElementDataFile = SheppLogan.raw (try to replace this field with your .dat filename)

If I were you, I'd start by trying to adjust these parameters until you manage to visualize a single projection (there are plenty of viewers that open mhd/raw files), and then create a header for the whole sequence (NDims = 3, etc ...) and concatenate the .dat binary files into a single one. You could use a script like the following :

#!/bin/bash
# Concatenate all projections into a single raw file
NbProj=300
i=0
list="projection${i}.raw"
for i in $(seq 1 1 $(($NbProj-1)))
do
        list="$list projection${i}.raw"
done
cat $list > SheppLogan.raw

which would concatenate all files named "projection0.raw", "projection1.raw", ... into "SheppLogan.raw"


-----Message d'origine-----
De : rtk-users-bounces at openrtk.org [mailto:rtk-users-bounces at openrtk.org] De la part de Laura Trubuil
Envoyé : jeudi 2 mai 2013 09:29
À : rtk-users at openrtk.org
Objet : [Rtk-users] .dat to .mha image

Dear RTK users,

I am working on GATE (from Geant4), to create projections images of tomosynthesis.
I have projections but they are in ".dat" format (binary matrix of float numbers that stores the simulated tomosynthesis image and is produced for each time slice).

I want to reconstruct a 3D volume, from projections, with RTK.
To do that, I know I must change the format of my images (for example to .mhd/.raw or to .mha format) but my problem is that I do not know how.

I anyone could help...

Regards,

Laura

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