In this issue, simultaneous differential equations were introduced. These differential equations are often used in the field of medical physics. The methods for solving them were also introduced, which include Laplace transform and matrix methods. Some examples were also introduced, in which Laplace transform and matrix methods were applied to solving simultaneous differential equations derived from a three-compartment kinetic model for analyzing the glucose metabolism in tissues and Bloch

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... ions for describing the behavior of the macroscopic magnetization in magnetic resonance imaging. In the next (final) issue, partial differential equations and various methods for solving them will be introduced together with some examples in medical physics.