Method for obtaining brain perfusion parameter maps through computed tomography perfusion imaging and its system

A method for obtaining the CT perfusion imaging parameter maps of brain, comprising:

• obtaining CT perfusion images, performing pre-processing on the CT perfusion images, and obtaining the discrete contrast agent concentration curves C(n) of each pixel point in the brain tissue, where n is the nth acquisition time point, and C(n) is the contrast agent concentration in the tissue corresponding to the nth time point;
• reading the acquisition time information of the CT perfusion images, and obtaining the acquisition time arrays T(n), where n is the nth time point, T(n) is the physical time of the image acquisition device when the nth image was collected, T(n) include Tc(n) corresponding to discrete contrast agent concentration curves C(n);
• intercepting the collection time arrays T(n) to obtain the relative collection time arrays t(n), wherein t(n) includes tc(n) corresponding to discrete contrast agent concentration curves C(n);
• combining the tissue contrast agent concentration curves C(n) with the corresponding relative collection time arrays t(n) to obtain the discrete time-concentration curves C(tn) of each pixel point in the brain tissue;
• and
• after fitting or interpolating the discrete time-concentration curves C(tn) of each pixel point, re-discretizing at the same time interval to obtain the discrete time-concentration curves C(n)′ of each pixel point in brain tissue, obtaining the CT perfusion imaging parameter maps of brain according to the time-concentration curves C(n)′.