Radiation Oncology

Table 4 The values of r _s between textural features and mechanical parameter differences

From: Texture analysis on the edge-enhanced fluence of VMAT

		MLC error		Gantry angle error		MU error
	d	r _s	p	r _s	p	r _s	p
ASM	1	−0.747	<0.001	0.445	0.004	0.108	0.506
	5	−0.749	<0.001	0.499	0.001	0.165	0.309
	10	−0.785	<0.001	0.600	<0.001	0.106	0.513
IDM	1	0.604	<0.001	−0.444	0.004	−0.243	0.131
	5	0.821	<0.001	−0.705	<0.001	−0.217	0.179
	10	0.787	< 0.001	−0.716	< 0.001	−0.206	0.203
Contrast	1	−0.853	< 0.001	0.655	< 0.001	0.145	0.372
	5	−0.843	< 0.001	0.643	< 0.001	0.160	0.323
	10	−0.825	< 0.001	0.636	< 0.001	0.217	0.179
Variance	1	−0.699	< 0.001	0.526	< 0.001	0.110	0.501
	5	−0.690	< 0.001	0.510	0.001	0.090	0.579
	10	−0.648	< 0.001	0.507	0.001	0.040	0.808
Correlation	1	0.766	< 0.001	−0.510	0.001	−0.050	0.761
	5	0.758	< 0.001	−0.540	< 0.001	−0.132	0.416
	10	0.728	< 0.001	−0.533	< 0.001	−0.157	0.332
Entropy	1	0.820	< 0.001	−0.516	0.001	−0.095	0.559
	5	0.823	< 0.001	−0.538	< 0.001	−0.169	0.297
	10	0.841	< 0.001	−0.592	< 0.001	−0.117	0.474

Abbreviations: MLC = multi-leaf collimator, MU = monitor unit, d = particular displacement distance, r_s = Spearman’s rank correlation coefficient, ASM = angular second moment, IDM = inverse difference moment.

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ISSN: 1748-717X

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