Review Article
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 |
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