The present invention relates to an improved method and system for simulating and constructing original actual Magnetic Resonance Images MRI from first modality of a patient to second modality, wherein the system is configured to receive an input MRI image taken in first modality, pre-process the input MRI image, send the processed image to a Convolutional Neural Network (CNN), and obtain the new constructed MRI images in second modality that are identical at the pixel level to the actual image as captured by the MRI machines.