1. A method for constructing an image of an object having an organ of interest utilizing a medical imaging system, said method comprising: scanning an image volume of the organ of interest to acquire image data defining a plurality of image frames; selecting one image frame as a baseline image defining a largest area for the organ of interest; comparing, for the organ of interest, corresponding pixels in the other image frames with pixels in the baseline image; replacing pixels in the baseline image with corresponding pixels having a greater pixel density value; and constructing a single attenuation correction (AC) image based on a maximized combined image formed from pixels having the highest density values.