Hadassah University Hospital director Shlomo Mor-Yosef said Saturday evening that the latest scan of the brain of Prime Minister Ariel Sharon, performed Saturday, shows a slight improvement, but his overall condition remains critical. Hadassah doctors will meet Sunday morning to decide when to rouse Sharon from his induced coma. Until Sharon regains consciousness, it will be impossible to determine the extent to which his brain has been damaged. Sharon, who is fighting for his life after suffering a severe stroke and cerebral hemorrhage Wednesday night, was taken for a procedural CT scan Saturday morning to check for internal bleeding and examine intra-cranial pressure following surgical intervention the day before.