Figure 4.

<T̄₂> (a and b) and p_I (c and d) maps calculated from raw and filtered images overlaid onto an anatomical image from one animal (Rat #3). For p_I, only voxels whose T₂ spectra were deemed admissible — defined as spectra that exhibited two components in the range 8–200 ms — are shown. Additional contributions from white matter were also removed (see Methods). Observe that there exists significant intra-tumoral heterogeneity.