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 6 Correlations between textural features and global gamma passing rates of the TrueBeam STx system

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

Textural features	d	2%/2 mm		2%/1 mm		1%/2 mm		1%/1 mm
Textural features	d	r	p	r	p	r	p	r	p
MapCHECK2 measurements
ASM	1	0.274	0.006	–	–	0.406	< 0.001	0.321	0.001
	5	0.347	< 0.001	–	–	0.531	< 0.001	0.407	< 0.001
	10	0.351	< 0.001	–	–	0.519	< 0.001	0.385	< 0.001
IDM	1	−0.333	0.001	–	–	−0.473	< 0.001	− 0.300	0.002
	5	−0.395	< 0.001	–	–	−0.538	< 0.001	−0.400	< 0.001
	10	−0.381	< 0.001	–	–	−0.546	< 0.001	−0.398	< 0.001
Contrast	1	0.337	0.001	–	–	0.432	< 0.001	0.277	0.005
	5	0.374	< 0.001	–	–	0.439	< 0.001	0.334	0.001
	10	0.311	0.002	–	–	0.441	< 0.001	0.336	0.001
Variance	1	0.213	0.033	0.202	0.044	0.262	0.008	0.339	0.001
	5	0.223	0.026	0.202	0.044	0.263	0.008	0.331	0.001
	10	–	–	–	–	0.234	0.019	0.247	0.013
Correlation	1	−0.254	0.011	–	–	−0.349	< 0.001	–	–
	5	−0.318	0.001	–	–	− 0.409	< 0.001	− 0.251	0.012
	10	−0.313	0.002	–	–	−0.468	< 0.001	−0.337	0.001
Entropy	1	−0.335	0.001	–	–	−0.478	< 0.001	− 0.350	< 0.001
	5	−0.343	< 0.001	–	–	−0.506	< 0.001	−0.378	< 0.001
	10	−0.352	< 0.001	–	–	−0.510	< 0.001	−0.377	< 0.001
ArcCHECK measurements
ASM	1	0.371	0.001	0.467	< 0.001	–	–	0.256	0.010
	5	0.418	< 0.001	0.580	< 0.001	0.229	0.022	0.369	< 0.001
	10	0.448	< 0.001	0.614	< 0.001	0.259	0.009	0.398	< 0.001
IDM	1	−0.475	< 0.001	−0.562	< 0.001	−0.300	0.002	−0.380	< 0.001
	5	−0.415	< 0.001	−0.537	< 0.001	−0.260	0.009	−0.352	< 0.001
	10	−0.398	< 0.001	−0.526	< 0.001	−0.259	0.009	−0.367	< 0.001
Contrast	1	0.397	< 0.001	0.532	< 0.001	0.209	0.037	0.311	0.002
	5	0.370	< 0.001	0.519	< 0.001	–	–	0.296	0.003
	10	0.375	< 0.001	0.519	< 0.001	–	–	0.322	0.001
Variance	1	–	–	0.252	0.011	–	–	–	–
	5	–	–	0.257	0.010	–	–	–	–
	10	–	–	0.293	0.003	–	–	–	–
Correlation	1	−0.432	< 0.001	−0.521	< 0.001	−0.299	0.002	−0.349	< 0.001
	5	−0.422	< 0.001	−0.530	< 0.001	−0.247	0.013	−0.319	0.001
	10	−0.463	< 0.001	−0.567	< 0.001	−0.262	0.009	−0.366	< 0.001
Entropy	1	−0.418	< 0.001	−0.585	< 0.001	−0.218	0.029	−0.362	< 0.001
	5	−0.441	< 0.001	−0.602	< 0.001	−0.238	0.017	−0.381	< 0.001
	10	−0.447	< 0.001	−0.610	< 0.001	− 0.250	0.012	−0.390	< 0.001

d particular displacement distance, r Spearman’s rank correlation coefficient, ASM angular second moment, IDM inverse difference moment

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ISSN: 1748-717X

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