1. A method for determining right ventricle stroke volume comprising the steps of: providing a plurality of three-dimensional images of right cardiac ventricle of a patient over a cardiac cycle; identically slicing each of the plurality of images; selecting an image from the plurality of images, for each time unit of the cardiac cycle; determining a region of interest in each slice of the selected images, wherein the region of interest shows the right ventricle of the patient; determining area of the region of interest using Equation 1: 
 Area=(Σnumber of pixels in region of interest)×resolution  (Equation 1); determining volume of the region of interest using Equation 2: 
 Volume=area×slice thickness  (Equation 2), where the slice thickness is the distance between each slice in the image; determining total volume of the region of interest for each time unit, wherein the maximum total volume is selected as an end diastolic volume and the minimum total volume is selected as an end systolic volume; and determining the right ventricle stroke volume using Equation 3: 
 Right Ventricle Stroke Volume=end diastolic volume−end systolic volume   (Equation 3), and wherein the resolution is calculated casino Equation 4: resolution = ∑ i = 1 p ⁢ scale ⁡ ( real ⁢ ⁢ size no. ⁢ of ⁢ ⁢ pixels ⁢ ⁢ in ⁢ ⁢ image ) i n , ( Equation ⁢ ⁢ 4 ) wherein p is an iteration number, n is the total number of iterations, no. pixels in image is a number of pixels in an object image of a known object, and real size is a measured size of the known object.