Hello everyone, I was working with the MultiScaleHessianBasedMeasureImageFilter , that is part of the Code/Review. I am using ITK 3.12.0. I think there is a small error in the way the code runs through the sigma values in the MultiScaleHessianBasedMeasureImageFilter.txx file. If a user enters the number of steps to be 1, then the loop would go on forever because of the following code section in the function ComputeSigmaValue( int ) in the same (.txx) file: if (m_NumberOfSigmaSteps < 2) { return m_SigmaMinimum; } The while loop (looping through sigma) checks that sigma be less than or equal to m_SigmaMaximum. This will always be true if the user entered SigmaMaximum >= SigmaMinimum, and numberOfSigmaSteps = 1. Thanks, Adarsh K. Ramasubramonian, Rensselaer Polytechnic Institute Troy NY