The Role of Imaging in Radiation Therapy Planning: Past, Present, and Future

Table 3

Basic MR functional imaging types that have shown promise in predicting outcomes for various tumor types.

Type of measurement	Functional imaging method	Known as	What is measured
Perfusion	Dynamic contrast enhanced	DCE, permeability	Gadolinium-induced; shortening of T1
	Dynamic; susceptibility contrast	DSC	Gadolinium-induced; shortening of T2*
	Arterial spin labeling	ASL	Intrinsic contrast; enhancement generated from; magnetization of arterial blood
Diffusion	Diffusion weighting imaging	DWI	Gradient-induced; sensitization of molecular; diffusion
Metabolic function	Spectroscopy	MRSI	Chemical composition based; on resonant frequency
Oxygenation	Bold-level oxygen; dependent	BOLD, fMRI	T2* differences in oxy- and deoxyhemoglobin