Table 1. The results of the MRA grading of moyamoya disease with PI3, CS3, and CS5.

	PI3
CS3 (CS5)	Stage 1	Stage 2	Stage 3	Stage 4
Stage 1	8 (8)
Stage 2		26 (24)
Stage 3		0 (2)	32 (31)
Stage 4			1 (2)	21 (21)

Two observers independently assessed 44 sides of 22 patients, thus a total of 88 results are illustrated. The κ value was 0.993 between PI3 and CS3, and 0.966 between PI3 and CS5. PI3, conventional TOF MRA with an acceleration factor of 3; CS3, compressed sensing TOF MRA with an acceleration factor of 3; CS5, compressed sensing TOF MRA with an acceleration factor of 5.