hi all, i have to calculate the volume or the surface of the activation area, can you give me some help in how to do it? thank you very much ************************************************************************ Sanaa Elmrini, PhD Student UFR Sciences et Imagerie Laboratoire d'Electronique et du Traitement du Signal Faculté Des Sciences, Rabat Department of Biophysics and Clinical MRI Methods Faculty of Medicine and Pharmacy of Fez Fez 30000 , Morocco Phone +212 70 061 890 Email: [log in to unmask] Sanaa EL MRINI