Update app.py

app.py

@@ -507,18 +507,18 @@ class DicomAnalyzer:
                     # raw_row2 = الصف الثاني
                     m1 = ws[f"{mean_col}{raw_row1}"].value
                     m2 = ws[f"{mean_col}{raw_row2}"].value
-                    std2 = ws[f"{std_col}{raw_row2}"].value
+                    std1 = ws[f"{std_col}{raw_row1}"].value
                     
                     try:
                         m1   = float(m1)   if m1   not in [None,''] else None
                         m2   = float(m2)   if m2   not in [None,''] else None
-                        std2 = float(std2) if std2 not in [None,''] else None
+                        std1 = float(std1) if std1 not in [None,''] else None
                     except:
-                        m1,m2,std2 = None,None,None
-                    if (m1 is not None) and (m2 is not None) and (std2 is not None) and (std2!=0):
+                        m1,m2,std1 = None,None,None
+                    if (m1 is not None) and (m2 is not None) and (std1 is not None) and (std1!=0):
                         mean_values.append(m1)
-                        stddev_values.append(std2)
-                        cnr_values.append((m1 - m2)/std2)
+                        stddev_values.append(std1)
+                        cnr_values.append((m1 - m2)/std1)
                 
                 # الآن نحسب المتوسط
                 if len(mean_values) > 0: