| 摘要 |
A solution is proposed for imaging a body-part that is perfused with a co ntrast agent. A corresponding method (900) includes the step of providing (9 03-907) a sequence of input images (for example, acquired with an ultrasound scanner); the input images offer a digital representation over time of the body-part. Each input image includes a plurality of input values (i.e., pixe l or voxel values); each input value is indicative of a response to an inter rogation signal (such as an echo signal for ultrasound waves) of a correspon ding location of the body-part, which possibly includes the contrast agent. The method further includes the step of generating (912-969) at least one fi ltered image from a plurality of selected ones of the input images (such as all of them or a subset thereof). Each filtered image includes a filtered va lue for each of a plurality of selected ones of the locations (for example, in a region of interest, or ROI). The filtered value of each selected locati on is indicative of the contrast agent that leaves the selected location aft er being substantially stationary at the selected location for a period of t ime, which is comprised between a first non- zero threshold and a second thr eshold higher than the first threshold (such as because the contrast agent d etaches from the location after having been immobilized thereon, or because it was moving very slowly). The filtered value is obtained by reducing, wher e present, a contribution of the contrast agent that is substantially statio nary at the selected location along the selected input images for a period o f time equal to or shorter than the first threshold, and by reducing a contr ibution of the contrast agent that is substantially stationary at the select ed location along the selected input images for a period of time equal to or longer than the second threshold.
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