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The CHANGE program enables the user to easily define the desired imaging system.
CHANGE contains a series of menus that prompt the user to input parameters specific
to the description of the system. These parameters are then written to a data file used
in SIMIND.
A SIMIND file name assumes a base name and a three character extension separated by
a period. The output file may have the same base file name as the input file but will
usually differ by the file extensions. The output file can easily be redirected to other file
names.
A default file, named SIMIND.smc, is always created when invoking the
CHANGE program. This file may be used when performing tests that do not need to be stored in
separate files. Each time that changes are made in
CHANGE, the modifications are
written to SIMIND.smc. Even when exporting to different files, the content in
SIMIND.smc is updated. Thus, this file should be regarded as a temporary file.
A file name can be entered after the program name
CHANGE at the operating system
command prompt. If this file already exists, it will be used when reading data into
CHANGE. All modifications will be saved to this file and to
simind.smc at exit. If only
entering by the command CHANGE, data can be exported/imported by Option 5 and 6 in
the MAIN MENU.
The coordinate system is defined in the figure below
When simulating voxel-based phantoms the first density/activity image is located
towards +X and the last is located towards –X. When simulating SPECT, the camera
rotates in the Z,Y plane either clock-wise or counter-clock wise [index 30]. |
