4 CTSim simulates the process of collecting tomographic X-ray data of
5 phantom objects. These X-ray data through the objects are called
6 projections. CTSim reconstructs the original phantom image from the
7 projections using a variety of algorithms.
9 CTSim is open-source and is covered by the GNU Public License (GPL).
11 Please enjoy CTSim. I'd like to hear any feedback
13 Kevin M. Rosenberg, M.D.
20 CTSim development began in 1983 while I was in medical school. It was
21 written using Lattice C and MS-DOS. I used 8086 assembly language to
22 code convolution and backprojection routes and also to write graphics
23 directly to an IBM EGA video adapter.
25 In 1999, I ported CTsim to GNU/Linux. In April 2000, the source code
26 for CTSim was published on the Internet.
28 In June 2000, entire code for revised and converted to C++.
34 The official home for CTsim is http://www.ctsim.org.
40 Several standard phantom objects are built-in. Other phantoms can be
41 loaded from ASCII files.
43 CTsim uses cross-platform compatible file formats for projection data and
50 ctsim - a graphical user interface for most functions. This programs
51 has all of the functionality of the command line tools except for
52 image comparison functions.
54 phm2if - generates an image file of a phantom object
56 phm2pj - Simulates the collection of CT data, or projections, of a
59 pjrec - Performs an CT reconstruction, also known as image
60 reconstruction from projections. Reads a projection file and writes a
63 pj2if - Converts projection data to a raw sinugram image
65 ifexport - Converts an image file to a variety of 8-bit and 16-bit image
68 pjinfo - Show information on a projection file
70 ifinfo - Show statistics and history labels of image files
76 Graphical User Interface
77 ------------------------
82 Command Line Interface
83 ----------------------
85 When evaluating CT simulation, in general, these steps are followed:
87 Create a phantom image and viewable image file
91 Simulate CT data collection and create a viewable image of raw projections
96 Perform CT reconstruction and create viewable image file
100 Display image information and comparative statistics
103 There is a sample shell script installed called 'sample-ctsim.sh'
104 in the tools direction that performs the above commands.
106 These functions can be invoked via a web interface with a CGI program
107 as described in the INSTALL file.
112 This program is written by Kevin M. Rosenberg, M.D.
114 It is covered by the GNU General Public License (GPL) which
115 allows copying and modifying this code with restrictions. See the
116 file COPYING for complete details.