Reorientation of cardiac images

A computerized method for estimating an orientation of a long axis of the heart of a patient, comprising:

• providing a computerized processor at least with an early frame cardiac image of the heart and a corresponding late frame cardiac image of the heart, obtained using an imaging modality selected from the group consisting of a PET modality and a SPECT modality;
• via said processor, defining a bounding box of the myocardium of the heart in said late frame cardiac image;
• in said processor, automatically applying the bounding box to the early frame cardiac image;
• in said processor, automatically estimating a main axis of the early frame cardiac image that is contained within the bounding box;
• in said processor, automatically reorienting the early frame cardiac image according to the estimated main axis;
• in said processor, automatically estimating a main axis of the late frame cardiac image contained within the bounding box;
• in said processor, automatically reorienting the late frame cardiac image according to the estimate main axis thereof;
• and
• in said processor, comparing the estimated main axis of the early frame cardiac image to the estimated main axis of the late frame cardiac image, to obtain a comparison result, and making an attribute of said comparison result available at an output of the processor as an electronic signal.