Fix samples with radii less than a given threshold

In certain cases, the dataset has samples with very small radii or even with zero-radii. These samples must be fixed before resampling the data to avoid any artifacts in the final reconstruction.

The issue names no file, test, or entry point. Start by locating the resampling and reconstruction code, then inspect how sample radii are validated or transformed. Done means samples below the given threshold, including zero-radius samples, are handled before resampling without artifacts in the final reconstruction.

Written by the indexing model from the issue text.