title: Letter to the editor regarding paper "Automatic computation of left ventricular volume changes over a cardiac cycle from echocardiography images by nonlinear dimensionality reduction".
authors.affiliation: Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran, shalbaf@iust.ac.ir.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Shalbaf
authors.forename: Hamid
authors.initials: H
authors.lastname: Behnam
mesh_terms: D006352:Heart Ventricles / Q000000981:diagnostic imaging*; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D010363:Pattern Recognition, Automated / Q000379:methods*; D014463:Ultrasonography