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 5 Correlations between textural features and global gamma passing rates for the Trilogy 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	–	–	–	–	0.331	< 0.001	0.259	0.002
	5	–	–	–	–	0.313	< 0.001	0.207	0.014
	10	–	–	–	–	0.358	< 0.001	0.261	0.002
IDM	1	–	–	–	–	− 0.198	0.019	–	–
	5	–	–	–	–	−0.336	< 0.001	−0.239	0.004
	10	–	–	–	–	− 0.298	< 0.001	−0.200	0.018
Contrast	1	–	–	–	–	0.322	< 0.001	0.246	0.003
	5	–	–	–	–	0.355	< 0.001	0.268	0.001
	10	–	–	–	–	0.382	< 0.001	0.284	0.001
Variance	1	–	–	0.192	0.023	0.319	< 0.001	0.284	0.001
	5	–	–	0.213	0.012	0.337	< 0.001	0.300	< 0.001
	10	–	–	0.250	0.003	0.349	< 0.001	0.342	< 0.001
Correlation	1	–	–	–	–	−0.229	0.006	–	–
	5	–	–	–	–	−0.315	< 0.001	− 0.201	0.017
	10	–	–	–	–	−0.348	< 0.001	−0.187	0.027
Entropy	1	–	–	–	–	−0.344	< 0.001	−0.272	0.001
	5	–	–	–	–	−0.360	< 0.001	−0.269	0.001
	10	–	–	–	–	−0.372	< 0.001	−0.281	0.001
ArcCHECK measurements
ASM	1	0.337	< 0.001	0.471	< 0.001	0.235	0.005	0.402	< 0.001
	5	0.383	< 0.001	0.551	< 0.001	0.268	0.001	0.483	< 0.001
	10	0.393	< 0.001	0.560	< 0.001	0.273	0.001	0.489	< 0.001
IDM	1	−0.422	< 0.001	−0.589	< 0.001	−0.350	< 0.001	−0.561	< 0.001
	5	−0.421	< 0.001	− 0.540	< 0.001	−0.321	< 0.001	−0.487	< 0.001
	10	−0.429	< 0.001	−0.500	< 0.001	−0.357	< 0.001	−0.472	< 0.001
Contrast	1	0.432	< 0.001	0.552	< 0.001	0.333	< 0.001	0.508	< 0.001
	5	0.375	< 0.001	0.486	< 0.001	0.296	< 0.001	0.452	< 0.001
	10	0.393	< 0.001	0.519	< 0.001	0.309	< 0.001	0.470	< 0.001
Variance	1	0.281	0.001	0.344	< 0.001	0.228	0.007	0.327	< 0.001
	5	0.269	0.001	0.326	< 0.001	0.210	0.013	0.310	< 0.001
	10	0.301	< 0.001	0.330	< 0.001	0.246	0.003	0.321	< 0.001
Correlation	1	−0.457	< 0.001	−0.582	< 0.001	− 0.358	< 0.001	− 0.540	< 0.001
	5	− 0.415	< 0.001	− 0.543	< 0.001	−0.328	< 0.001	−0.502	< 0.001
	10	−0.414	< 0.001	−0.582	< 0.001	−0.306	< 0.001	−0.517	< 0.001
Entropy	1	−0.382	< 0.001	−0.525	< 0.001	−0.267	0.001	−0.460	< 0.001
	5	−0.385	< 0.001	−0.543	< 0.001	−0.266	0.001	−0.476	< 0.001
	10	−0.384	< 0.001	−0.544	< 0.001	−0.261	0.002	−0.475	< 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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