Table 5.

The System Used to Grade the Cho/Cr for Each MRS Voxel.^a

	Grade	Image Intensity	CTV	Dose Painting
Cho/Cr< I	0	0
1 ≤ Cho/Cr < 2	1	85	CTV1	5400
2 ≤ Cho/Cr < 3	2	170	CTV2	5940
3 ≤ Cho/Cr	3	255	CTV3	7020

Abbreviations: Cho, choline; Cr, creatine; CTV, clinical target volume; MRS, magnetic resonance spectroscopy.

^a The first column Lists the Cho/Cr ratio, which is mapped to a grade in the second column. Columns 3, 4, and 5 show the corresponding image intensity, CTV, and dose level for each CHO–Cr grade, respectively.⁴³