Retrospective analysis of recurrence patterns and clinical outcome of grade II meningiomas following postoperative radiotherapy

Table 2 Extent of target volumes in patients with tumor recurrence

ID	GTVini	GTVrt	Intersection	Progression zone	Growth zone	Dice’s coefficient
1	14.40	3.55	2.69	0.57	1.84	0.30
2	3.41	2.04	0.43	1.31	0.6	0.16
3	12.70	18.85	11.04	6.72	4.61	0.71
4	12.10	4.84	2.98	1.41	1.02	0.36
5	18.20	10.61	9.07	0.76	0.95	0.64
6	7.59	4.03	3.01	0.51	1.12	0.52
7	33.70	24.82	19.39	3.94	4.66	0.66

All volumes are given in cm³. Progression zone and Growth zone are referring to the size of the zone, defined as described in Fig. 2b). Dice’s coefficient was calculated using the volumes of GTVini, GTVrt, and their intersection, reflecting a high similarity in n = 6 cases. ID: patients’ number

ISSN: 1748-717X