In the modern IMRT/SBRT era, what should be the appropriate definition for the term "hot spot" in evaluating a plan?

The dose heterogeneity with IMRT has improved significantly over last 15 years. In past it was not unsual to see point hot spot (.03 cc) of 120% in PTV with a significant volume of PTV getting 110% or more.In modern planning with improved software and hardware usally point hotspot in majority of cas...