A longitudinal study on parotid and submandibular gland changes assessed by magnetic resonance imaging and ultrasonography in post-radiotherapy nasopharyngeal cancer patients.

As the reduction became stabilised after 6 months, the vascular resistance then gradually built up and therefore followed an increasing trend.

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Both peak systolic velocity and end diastolic velocity increased after 6 months post-RT then followed a decreasing trend up to 24 months post-RT.

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