Figure 1.

Longitudinal diffusion data from a 45 yr old head and neck cancer patient (Patient #1). The error bars indicate standard deviations within the ROI. The brain stem ADC values did not significantly change over the course of the treatment with a nonsignificant linear fit slope of −0.002 × 10⁻³ mm²/s per day, which is expected. For this patient, the average tumor ADC increased consistently over time from 1.3 × 10⁻³ to 1.6 × 10⁻³ mm²/s.