Should improving imaging chest standards for staging impact the radiographic response criteria for lung metastases in Wilms?  

Given that modern scans have a very high resolution, allowing one to find very small densities, how should we apply the omission criteria for whole lung irradiation in the modern era?
Are there additional criteria that can aid in confirming CR given that some very small residual densities may remain? I.e. should rounded 1 mm sized densities be handled differently than more linear or more hazy residual mm density?