Case illustration of three patients. The polar map for the 4DM software is shown at left, for the ECTb software at center, and for the QPS software at right. (A) Abnormal case from a 58-year-old hypertensive man with typical chest pain. The summed stress score (SSS)/total stress defect extent (TDE) = 21/47%, 4/7%, and 8/14% for 4DM, ECTb, and QPS, respectively. (B) Normal case from a 68-year-old hypertensive woman with atypical chest pain. The SSS/TDE = 0/0%, 11/21%, and 0/0% for 4DM, ECTb, and QPS, respectively. (C) 74-year-old hypertensive woman with atypical chest pain and no risk factors. The SSS/TDE = 3/2%, 9/22%, and 8/8% for 4DM, ECTb, and QPS, respectively. The boundaries of the left ventricle automatically defined by the software packages are illustrated in the horizontal long axis slices. Note the different approach to define the septal part.