Objective: of this study is to set standard values for the native T1 values in both normal and diseased myocardium on a 3 tesla MRI machine. Methodology: this study was carried out in Misr Radiology Center. 31 patients were divided into normal group (control) including 10 patients and diseased group including 21 patients. Result: The native T1 values on the healthy myocardium ranged from 1110 to 1300 msec, with ECV values ranging from 25 to 33 % with variable elevations of the native T1 and ECV values according to the pathology affecting the myocardium. We concluded that the above values are the reference values for the 3 T MRI machine.