Abstract: This invention relates to a method of ultrasonically imaging a region of interest that may contain anechoic and/or hypoechoic echoes. The method comprises the steps of: providing a first and a second set of ultrasound data, said two sets comprising information of the region of interest at two different instants of time respectively, determining from the first and second data sets, a temporal consistency value of at least an area of the region of interest, and producing an image indicating this area as being hypoechoic or anechoic in accordance with said temporal consistency value. Doing so, an anechoic image produced by the method of the invention emphazises the rendering of anechoic and/or hypoechoic areas over echoic ones.