Table 2.

Measured ultrasound parameters irradiated and non-irradiated side

Parameter	Location	Time point	Irradiated side	n	Control side	n	P value
Plaque	CCA/ICA	n/a	7	26	3	26	0.291
IMT (mm)	Distal CCA	Diastole	0.54 [0.50–0.61]	26	0.50 [0.44–0.54]	26	0.001*
	ICA		0.45 [0.44–0.46]	26	0.45 [0.44–0.47]	23	0.59
PWV (m/s)	Mid-CCA	Begin-systole	4.89 [4.22–5.75]	25	4.56 [3.78–5.58]	22	0.36
		End-systole	6.77 [5.82–7.78]	24	6.44 [5.16–6.97]	22	0.24
SWV (m/s)	Proximal CCA	Averaged over cardiac cycle	A: 4.13 [3.56–4.61]	26	A: 4.17 [3.91–4.39]	25	0.48
			P: 4.30 [3.88–4.71]	26	P: 4.06 [3.84–4.57]	26	0.42
	Mid-CCA		A: 4.68 [4.14–5.04]	26	A: 4.44 [3.63–4.70]	24	0.03*
			P: 4.52 [4.08–5.34]	26	P: 4.50 [4.05–5.03]	24	0.46
	Distal CCA		A: 4.67 [3.75–5.10]	25	A: 4.25 [3.58–4.61]	26	0.06
			P: 4.40 [3.96–5.24]	25	P: 4.48 [3.84–5.13]	26	0.74
	ICA		A: 2.63 [2.29–3.54]	23	A: 2.67 [2.33–3.18]	22	0.34
			P: 2.84 [2.34–3.19]	22	P: 2.23 [1.82–2.62]	19	0.01*

IMT intima-media thickness, PWV pulse wave velocity, SWV shear wave velocity, CCA common carotid artery, ICA internal carotid artery, A anterior; P posterior

^*Significant difference (p < 0.05) between irradiated and control side

¹Fisher’s exact test