The Monte Carlo simulation code, SIMIND, describes a standard clinical SPECT camera and can easily be modified for almost any type of calculation or measurement encountered in SPECT imaging. SIMIND has been developed by Professor Michael Ljungberg, Medical Radiation Physics, Department of Clinical Sciences, Lund, Lund University, Sweden.
The entire code is written in FORTRAN and includes versions that are fully operational on Linux systems (x86), Mac systems running OSX, and on Windows (x86). The majority of the main code structure is similar for all of the operating systems; but, in cases where the operating system becomes unique, additional information on the code as it pertains to the specific system is provided.
The usefulness in a Monte Carlo program is the ability to study in detail why images from nuclear medicine scintillation camera systems is degraded. For example, the images above show a series of simulations. First image correspond to a imaging situation without patient motion and a perfect camera resolution. Second image include patient movements (respiration and heart beating). Next is an image with a normal SPECT system resolution for patient movements. The two next images show degradation due to a) photon attenuation and b) photon attenuation and scatter contribution. In the lst image a realistic noise level have been added.
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Michael Ljungberg