T1 and T2 signals are examined in MRI. T1 low signal T2 low signal in MRI suggests that there may be an acute phase of calcification of the bone cortex, fibrous structures or hematoma. T1 low signal T2 low signal, also known as T1 long signal T2 short signal, can be simply understood as less water content at the site and is often seen in the acute phase of bone cortex, fibrous structures, calcification or hematoma. The fracture will often have both hemorrhage and edema manifestations. An MRI of a fracture with T1 low signal and T2 low signal, if done early after the fracture, suggests that there may be a hematoma formed by a ruptured blood vessel bleeding in the area, or there may be calcification present. If the result is T1 low signal and T2 high signal, then it suggests that there may be post-traumatic edema. For the fracture T1 low signal, T2 low signal, should be combined with the clinical injury, improve the relevant auxiliary examination, under the guidance of the doctor for treatment.