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Article History

Received: 27 September 2021

Revised: 29 November 2021

Accepted: 11 December 2021

First Online: 19 October 2022

CONFLICT OF INTEREST

: The author declares that there is no conflicts of interest.

: A software package based on the Monte Carlo method was created to simulate the procedure for examining a patient using the SPECT/CT method (virtual tomograph). This approach allows obtaining raw data close to clinical results. Since a system matrix based on an analytical approach is used to solve the inverse problem, the use of the Monte Carlo method for solving the direct problem ensures the independence of solutions, which is an important factor in the numerical simulation of the patient-examination procedure. Also, this software solution can be modified for other tasks of nuclear medicine, for example, for modeling the procedure for examining a patient using positron-emission tomography.The calculation of the passage of γ rays through the collimator was implemented, tested, and verified. The calculation of the projection images was as close as possible to the real clinical procedure. Good agreement with clinical results was obtained. This makes it possible to speak about the successful verification of calculations for the passage of γ radiation in biological tissues and through the collimator-detector system.