Updating input function calculation

cardiacSPECT/cardiacSPECT.py

@@ -829,10 +829,11 @@ class cardiacSPECTLogic(ScriptedLoadableModuleLogic):
 
        dt=0;
        t0=0;
+       ft=self.frame_time
        for i in range(0,n):
            vol="testVolume"+str(i)
            fx=ft[i]
-           fy=self.logic.meanROI(vol,juse)
+           fy=self.meanROI(vol,juse)
            dt=2*ft[i]-t0
            t0+=dt