Provided by: plastimatch_1.7.0+dfsg.1-1_amd64 
NAME
drr - create a digitally reconstructed radiograph
SYNOPSIS
drr [options] [infile]
DESCRIPTION
A digitally reconstructed radiograph (DRR) is a synthetic radiograph which can be generated from a
computed tomography (CT) scan. It is used as a reference image for verifying the correct setup position
of a patient prior to radiation treatment.
DRR USAGE
The drr program that comes with plastimatch takes a CT image as input, and generates one or more output
images. The input image is in MHA format, and the output images can be either pgm, pfm, or raw format.
The command line usage is:
Usage: drr [options] [infile]
Options:
-A hardware Either "cpu" or "cuda" (default=cpu)
-a num Generate num equally spaced angles
-N angle Difference between neighboring angles (in degrees)
-nrm "x y z" Set the normal vector for the panel
-vup "x y z" Set the vup vector (toward top row) for the panel
-g "sad sid" Set the sad, sid (in mm)
-r "r c" Set output resolution (in pixels)
-s scale Scale the intensity of the output file
-e Do exponential mapping of output values
-c "r c" Set the image center (in pixels)
-z "s1 s2" Set the physical size of imager (in mm)
-w "r1 r2 c1 c2" Only produce image for pixes in window (in pix)
-t outformat Select output format: pgm, pfm or raw
-i algorithm Choose algorithm {exact,uniform}
-o "o1 o2 o3" Set isocenter position
-I infile Set the input file in mha format
-O outprefix Generate output files using the specified prefix
The drr program can be used in either single image mode or rotational mode. In single image mode, you
specify the complete geometry of the x-ray source and imaging panel for a single image. In rotational
mode, the imaging geometry is assumed to be
The command line options are described in more details as follows.
-A hardware
Choose the threading mode, which is either "cpu" or "cuda". The default value is "cpu".
When using CPU hardware, DRR generation uses OpenMP for multicore acceleration if your compiler
supports this. Gcc and Microsoft Visual Studio Professional compilers support OpenMP, but
Microsoft Visual Studio Express does not.
At the current time, cuda acceleration is not working.
-a num Generate num equally spaced angles
-r "r1 r2"
Set the resolution of the imaging panel (in pixels). Here, r1 refers to the number of rows, and
r2 refers to the number of columns.
SINGLE IMAGE MODE
The following example illustrates the use of single image mode:
drr -nrm "1 0 0" \
-vup "0 0 1" \
-g "1000 1500" \
-r "1024 768" \
-z "400 300" \
-c "383.5 511.5" \
-o "0 -20 -50" \
input_file.mha
In the above example, the isocenter is chosen to be (0, -20, -50), the location marked on the CT image.
The orientation of the projection image is controlled by the nrm and vup options. Using the default
values of (1, 0, 0) and (0, 0, 1) yields the DRR shown on the right: [image] [image]
By changing the normal direction (nrm), we can choose different beam direction within an isocentric
orbit. For example, an anterior-posterior (AP) DRR is generated with a normal of (0, -1, 0) as shown
below: [image]
The rotation of the imaging panel is selected using the vup option. The default value of vup is (0, 0,
1), which means that the top of the panel is oriented toward the positive z direction in world
coordinates. If we wanted to rotate the panel by 45 degrees counter-clockwise on our AP view, we would
set vup to the (1, 0, 1) direction, as shown in the image below. Note that vup doesn't have to be
normalized. [image]
ROTATIONAL MODE
In rotional mode, multiple images are created. The source and imaging panel are assumed to rotate in a
circular orbit around the isocenter. The circular orbit is performed around the Z axis, and the images
are generated every -N ang degrees of the orbit. This is illustrated using the following example:
drr -N 20 \
-a 18 \
-g "1000 1500" \
-r "1024 768" \
-z "400 300" \
-o "0 -20 -50" \
input_file.mha
In the above example, 18 images are generated at a 20 degree interval, as follows: [image]
AUTHOR
Plastimatch is a collaborative project. For additional documentation, please visit
http://plastimatch.org. For questions, comments, and bug reports, please visit
http://groups.google.com/group/plastimatch.
COPYRIGHT
Plastimatch development team (C) 2010-2015. You are free to use, modify, and distribute plastimatch
according to a BSD-style license. Please see LICENSE.TXT for details.