Prediction of VMAT delivery accuracy with textural features calculated from fluence maps

Park, Jong Min; Kim, Jung-in; Park, So-Yeon

doi:10.1186/s13014-019-1441-7

Radiation Oncology

Table 7 Correlations between textural features and mechanical errors

From: Prediction of VMAT delivery accuracy with textural features calculated from fluence maps

Textural feature	d	MLC error		Gantry angle error		MU error
Textural feature	d	r	p	r	p	r	p
Trilogy
ASM	1	− 0.767	< 0.001	–	–	−0.382	< 0.001
	5	−0.860	< 0.001	–	–	−0.417	< 0.001
	10	−0.843	< 0.001	–	–	−0.482	< 0.001
IDM	1	0.788	< 0.001	–	–	0.391	< 0.001
	5	0.679	< 0.001	–	–	0.657	< 0.001
	10	0.599	< 0.001	–	–	0.640	< 0.001
Contrast	1	−0.759	< 0.001	–	–	−0.588	< 0.001
	5	−0.617	< 0.001	–	–	−0.718	< 0.001
	10	−0.688	< 0.001	–	–	−0.688	< 0.001
Variance	1	−0.441	< 0.001	−0.199	0.018	−0.718	< 0.001
	5	−0.401	< 0.001	−0.215	0.011	−0.746	< 0.001
	10	−0.429	< 0.001	−0.200	0.018	−0.722	< 0.001
Correlation	1	0.807	< 0.001	–	–	0.394	< 0.001
	5	0.717	< 0.001	–	–	0.542	< 0.001
	10	0.802	< 0.001	–	–	0.522	< 0.001
Entropy	1	0.811	< 0.001	–	–	0.520	< 0.001
	5	0.836	< 0.001	–	–	0.516	< 0.001
	10	0.830	< 0.001	–	–	0.529	< 0.001
TrueBeam STx
ASM	1	−0.780	< 0.001	−0.313	< 0.001	−0.440	< 0.001
	5	− 0.858	< 0.001	−0.404	< 0.001	−0.572	< 0.001
	10	−0.859	< 0.001	−0.411	< 0.001	−0.589	< 0.001
IDM	1	0.747	< 0.001	0.507	< 0.001	0.673	< 0.001
	5	0.805	< 0.001	0.399	< 0.001	0.589	< 0.001
	10	0.744	< 0.001	0.280	0.005	0.505	< 0.001
Contrast	1	−0.829	< 0.001	−0.490	< 0.001	− 0.649	< 0.001
	5	−0.843	< 0.001	−0.403	< 0.001	−0.579	< 0.001
	10	−0.819	< 0.001	−0.353	< 0.001	−0.545	< 0.001
Variance	1	−0.541	< 0.001	–	–	−0.209	0.037
	5	−0.536	< 0.001	–	–	−0.211	0.035
	10	−0.607	< 0.001	−0.214	0.033	−0.292	0.003
Correlation	1	0.695	< 0.001	0.483	< 0.001	0.617	< 0.001
	5	0.802	< 0.001	0.438	< 0.001	0.627	< 0.001
	10	0.819	< 0.001	0.411	< 0.001	0.608	< 0.001
Entropy	1	0.873	< 0.001	0.404	< 0.001	0.579	< 0.001
	5	0.885	< 0.001	0.437	< 0.001	0.616	< 0.001
	10	0.887	< 0.001	0.440	< 0.001	0.628	< 0.001

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

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