  We present a new system based on tracking the temporal evolution of stroke
lesions using an image registration technique on CT exams of the patient's
brain. The system is able to compare past CT exams with the most recent one
related to stroke event in order to evaluate past lesions which are not related
to stroke. Then, it can compare recent CT exams related to the current stroke
for assessing the evolution of the lesion over time. A new similarity measure
is also introduced for the comparison of the source and target images during
image registration. It will result in a cheaper, faster and more accessible
evaluation of the acute phase of the stroke overcoming the current limitations
of the proposed systems in the state-of-the-art.
