Treatment assessment of radiotherapy using MR functional quantitative imaging

Figure 1 An example of brain apparent diffusion coefficient maps calculated from diffusion weighted images (b = 500 mm²/s) in a sagittal plane before (A) and after (B) radiotherapy. The white arrows indicate a comparison of superimposed colored maps of neural fiber bundles derived from diffusion tensor imaging data (b = 500 mm²/s).

Figure 2 An example of brain neural fiber bundles (solid arrows) derived from diffusion tensor imaging data (b = 500 mm²/s). The pre-treatment (A) and post-treatment (B) results are superimposed on coronal T1-weighted magnetic resonance images. The dashed arrows indicate gross tumor volume (pink boundary).

Figure 3 An example of permeability rate constant K^trans map derived from dynamic contrast-enhanced imaging. The pre-treatment (A) and post-treatment (B) K^trans results within gross tumor volume are superimposed on axial T1-weighted magnetic resonance images.

Figure 4 An example of sagittal breast T1w image (A) and the diffusion weighted image (b = 500 mm²/s) using echo planar imaging sequence (B). The red circle in (B) highlights the distorted breast boundary.