Table 2.

Intra- and postoperative evaluation of residual tumor mass using arterial spin labeling (ASL) and anatomical imaging.

Patient data		Arterial spin labeling		Anatomical imaging
No.	Diagnosis	Intraoperative	Postoperative	Intraoperative	Postoperative
1a	RT	0	0	0	1 (0)a
2	RT	1	1	1	1
3	RT	0	0	0	0
4	P	1	1	1	1
5	P (CTx)	0	0	0	0
6b	P	1	1b	1	0b
7	RT	1	0	1	0
8	P	1	1	1	1

In this rating, 0 means no visible residual and 1 means visible residual tumor. The ICC for the intraoperative acquired data was: 0.873 and for the postoperative data: 0.750. RT: recurrent tumor; P: primary tumor; CTx: (neoadjuvant) chemotherapy.

^aAt first a structure was misinterpreted as residual tumor mass but later amended to being a partial volume effect of an artery (see also Fig. 2).

^bIn this case residual tumor was visible intraoperatively in both ASL and anatomical imaging, postoperatively only in the ASL. The contrast-enhanced T1 images needed to be reevaluated and it was concluded that there is still residual tumor mass (see also Fig. 3).