How to display term images instead of term names in the term selection process? I have a content type with a term reference field (check boxes widget, vocabulary: Category) from which every user has to choose one term to be attached to his node. 

I have also added an image field to the Category vocabulary to attach a default image to each term.

How can i display the term images and the term names instead of only the term names in the term selection process when creating the node? Is there a module out there? 

Or maybe using hook form alter. Any guidelines?
Looks like the Taxonomy Term Reference Tree Widget module gives you the ability to add images to term references. Here is a quote about it (from the module's project page):


  ... provides an expandable tree widget for the Taxonomy Term Reference field in Drupal 7. This widget is intended to serve as a replacement for Drupal's core Taxonomy Term Reference widget, which is a flat list of radio buttons or checkboxes and not necessarily fit for medium to large taxonomy trees.