Table 1.

Correlation and linear regression results

	11.3 mGy/s			3.6 mGy/s			1.3 mGy/s
	SLS	PHS	STF	SLS	PHS	STF	SLS	PHS	STF
$\rho$	0.98	0.99	0.99	0.98	0.99	0.99	0.91	0.93	0.99*
$p$	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
$a$	1.59	0.93	1.00	1.65	1.00	1.01	0.92	0.92	1.02
$b$	−5.67	2.21	5.45	−7.05	−0.29	5.53	12.47	2.51	4.60
$R^2$	0.96	0.98	0.97	0.96	0.98	0.98	0.83	0.87	0.97

Pearson correlation $\rho$ and corresponding p-value are shown for least squared fit (SLS), phase shift (PHS), and the proposed spatiotemporal frequency (STF) approach and all three pre-patient air kerma rates (scaled to the interventional reference point). Additionally, linear regression parameters $a$ and $b$ and corresponding goodness of fit ($R^2$) are listed.