Table 4.

MRI Signal Intensity Changes.

		T1W signal intensity
Author	Group of patients	Pre-RT	Mid-RT	Post-RT	3 Months post-RT	Late post-RT
Popovtzer et al 43	All patients	0.87 ± 0.15			0.80 ± 0.19
	PCM mean dose < 50 Gy	0.85 ± 0.12			0.86 ±0.16
	PCM mean dose >50 Gy	0.88 ± 0.16			0.77 ± 0.20
Messer et al 46	All patients	1.5 ± 0.4			1.4 ± 0.4
	PCM mean dose < 62.25 Gy	1.3 ± 0.4			1.6 ± 0.4
	PCM mean dose > 62.25 Gy	1.6 ± 0.4			1.3 ± 0.4
		T2W signal intensity
Popovtzer et al 43	All patients	0.62 ± 0.5			1.14 ± 0.9
	PCM mean dose < 50 Gy	0.42 ± 0.07			0.60 ± 0.18
	PCM mean dose > 50 Gy	0.71 ± 0.57			1.38 ± 1.00
Meheissen et al 45	All patients	0.6	0.8	0.9
Messer et al 46	All patients	0.48 ± 0.1		0.73 ± 0.2		0.52 ± 0.2
	PCM mean dose < 62.25 Gy	0.48 ± 0.2		0.71 ± 0.2
	PCM mean dose > 62.25 Gy	0.48 ± 0.1		0.74 ± 0.2
		T1W + contrast signal intensity
Meheissen et al 45	All patients	0.9	1.2	1.4

Abbreviations: PCM, pharyngeal constrictor muscles; RT, radiotherapy.