It is known that the signal intensity of MR of the hemorrhage or hematoma varies with the age of the lesion. The mechanism causing the various MR intensity is mainly related to change of T1 and T2 relaxation times of blood resulting from physiochemical changes in the extravasated blood. It has been suggested that this change of relaxation times of blood is largely due to the conversion of hemoglobin to the Methemoglobin form, a substance with a relaxing effect on nuclear spins. The purpose of this study was to present the measured values of T1 ad T2 relaxation times of blood in magnetic field strength of 2,0 Tesla, and to evaluate the relation of MR signal intensity, T1 & T2 values in high-field MR scanner, with Hb, met-Hb and the age of blood. A total of 31 samples of whole blood were examined in vitro on 2.0T MR scanner at Korea Advanced institute of science & technology. The T1 and T2 relaxation times were measured with the MR images of all blood samples, and correlated wit the concentrations of Hb, met-Hb and lapse of the time of all blood samples.