Shear Wave Elastography: A New Noninvasive Tool to Assess the Intensity of Fibrosis of Irradiated Salivary Glands in Head and Neck Cancer Patients

Table 1

Elastography values in kPa—summary.

		Elastography values (kPa)
	Number of patients	Parotid gland			Submandibular gland			Mean parotid + submandibular	value
		Mean	Median	St. dev.	Mean	Median	St. dev.
Type of RT
Primary RT	9	46.2	23	41.1	39.5	43.5	23.3	42.8	0.58
Adjuvant RT	43	33.6	32	20.0	30.3	25	20.8	32.0
IMRT	19	44.4	33.5	33.2	34.5	33.5	21.8	39.4	0.92
Conventional	33	40.2	41.5	23.6	39.4	30	30.1	39.8
Tumour localization
Larynx	40	39.7	34.5	25.0	38.5	31.0	29.4	39.1	0.81
Oropharynx	9	50.7	47.5	38.2	35.6	30.0	23.4	43.4
Maxilla	3	41.1	39.5	16.8	30.2	25.5	18.6	35.6
RT fields
Lateral	37	43.3	41	26.8	36.8	34.0	21	40.2	0.73
Only for primary	15	37.7	35.5	17.3	38.8	35.5	24.9	38.2
Time from RT
0	5	45.8	17	51.0	22.6	16	18.0	34.2	0.56
6	7	43.5	39.5	27.6	29.8	30	15.4	36.6
12	7	44.3	39.5	24.0	47.7	54	23.9	46.0
24	33	40.17	41.5	23.7	39.4	30	30.1	39.7
RT group	52	41.7	40.7	24.4	37.6	34.5	22	39.6	0.00
Control group	54	26.0	25.2	8.6	22.4	21	7.5	24.2