1. A method for mapping a myocardium of a patient, comprising: recording a series of angiographic recordings of the patient directly after administering a contrast agent to the patient by an imaging recording device; determining a series of trend patterns of the contrast agent in the angiographic recordings by a computing unit; selecting a reference area in one of the angiographic recordings by the computing unit; defining the trend pattern of the one of the angiographic recordings in the reference area as a reference curve by the computing unit; calculating a series of correlation coefficients between the trend patterns and the reference curve by the computing unit; comparing the correlation coefficients with a threshold value by the computing unit; and mapping the myocardium based on the comparison by the computing unit to determine a perfusion in the myocardium, wherein the correlation coefficients are determined as follows: c ⁡ ( X , Y ) = ∑ i = 1 n ⁢ ( x i - x _ ) ⁢ ( y i - y _ ) ∑ i = 1 n ⁢ ( x i - x _ ) 2 ⁢ ∑ i = 1 n ⁢ ( y i - y _ ) 2 with x _ = ∑ i = 1 n ⁢ x i ⁢ ⁢ y _ = ∑ i = 1 n ⁢ y i where X, Y are vectors of two time-intensity curves, x , y are average values of X and Y, c(X,Y) is the correlation coefficient of X and Y.