Geometric distortion
A reconstructed image should render as much as possible the true geometry of the corresponding medium. As a consequence, methods which are not accurate from a geometrical point of view will be penalized in this challenge.
In order to assess the geometrical correctness of the reconstructed method, a dedicated numerical phantom with known position of scatterers has been generated. For each of the scatterers present in the phantom, an euclidean distance between the observed positions (defined as the position of the maximum of amplitude of the reconstructed bmode image) and the true positions is computed.
In this way, if one of the measured distances is higher than the wavelength of the emitted field (from the probe settings used in this challenge, the wavelength is equal to 0.29 mm), a penality of 40 points will be affected to the participant.