Efficiency of High and Standard b Value Diffusion-Weighted Magnetic Resonance Imaging in Grading of Gliomas

Figure 7

12-year-old female patient with astroblastoma (grade II) in the left frontoparietal lobe. Based on the signal characteristics of T2WI and postcontrast T1WI, three ROIs were placed on the solid component of the tumor and three ROIs were placed on the contralateral NAWM on ADC images. Images (c, d). (a). On the T2 FLAIR sequence (TR/TE = 8800/120 ms), the tumor is hyperintense. (b). On T1WI SE (TR/TE = 410/9 ms) after contrast injection, the tumor is hypointense with ring enhancement. (c). ADC map at a standard b value (TR/TE = 6100/152 ms; b = 1000s/mm²). (d). ADC map at a high b value (TR/TE = 8600/152 ms; b = 3000s/mm²). The tumor is more hypointense on the ADC map obtained at a high b value than the ADC map obtained at a standard b value.

(a)

(b)

(c)

(d)