Table 3: Agreement Between Partial Response Versus Normalized Partial Responses.

Partial Response

Linear

Area

Ellipsoid

Segmentation

Linear

.

81%

67%

67%

Area

81%

.

86%

67%

Volume Ellipse

81%

81%

.

81%

Volume Segmented

86%

76%

76%

.

Upper right figures demonstrate agreement (Kappa Statistic) between methods of response determination when a uniform 50% response criterion is applied. Lower left figures demonstrate agreement when the response criteria is normalized to a 50% area reduction. (All figures statistically significant at p < 0.05 except *P = 0.06.)

Low Grade Glioma: A Measuring Radiographic Response to Radiotherapy