MRI plain scan

The magnetic resonance scan is an MRI scan without injection of contrast agent. It uses the nuclear spin motion. Under the action of an external static magnetic field, the original disorderly hydrogen atomic nuclei are aligned in the direction of the external magnetic field and continue to precess. When the external magnetic force is stopped immediately, The hydrogen atoms in the human body will return to the original state at the same time and the same tissue; this is called relaxation (relaxation) and the relaxation time of human tissues under pathological conditions is different. These signals are collected by a computer system and converted into images by digital reconstruction technology To provide scientific diagnostic results for clinical and research.