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The biggest drawbacks of existing NMRI (Nuclear Magnetic Resonance Imaging) systems are their physical size, hardware and operating costs, and their lack of portability. This has encouraged low-cost and portable applications that can operate in low magnetic fields and volumes. These studies attempt to fill the gaps in areas such as object and practical medical imaging, substance analysis and determination, production quality and waste control. However, the very weak, inhomogeneous and nonlinear magnetic fields they have are the most important factors that negatively affect the results in these systems. This study was carried out with the idea that a working simulation for design would fill an important gap in examining and evaluating the relevant fields and their results. With this simulation, imaging results can be obtained for computer generated fields and 3D phantom tissues. In this study, magnetic field components in a limited Cartesian space for the static main magnetic field and gradient field coils required for basic NMRI were computerized according to the Biot-Savart principle. A spatial volume region has been determined where the static main magnetic field is sufficiently homogeneous and the gradient fields are sufficiently linear. By rescaling all field magnitudes working together, spin FID signals were generated for virtual 3D phantom in the same limited space, k-space and NMR images were obtained. [ABSTRACT FROM AUTHOR]