Figure 1From: Development of multivariate NTCP models for radiation-induced hypothyroidism: a comparative analysisThe cross-correlation matrixes for the variables belonging to set 1 (a) and to set 2 (b). The colorbar represents the Spearman’s rank correlation coefficient value. NTCP: normal tissue complication probability , Vx (%):percentage of thyroid volume exceeding X Gy; Vx (cc): absolute thyroid volume exceeding X Gy.Back to article page