Is IMRT preferred over 3D conformal RT for lymphoma of the head and neck?

If, based on the location of the node, we can spare the parotid gland more then we would do. The dose response curve for parotid salivary function is sigmoidal and not an all or none phenomenon, which is to say that the mean dose of 15Gy better than 25Gy which is better than 35Gy. As these patients ...