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Atlas of Human Body Ultrasound Scanning_ Methods and Diagnostic Applications ( PDFDrive ).pdf
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4  Thyroid Scanning

45

 

 

7\ Doppler Spectrum Flow

Imaging of the Inferior

Thyroid Artery

Fig. 4.7  Doppler spectrum flow imaging of the inferior thyroid artery

7.1\ Scanning Method

No specific preparation is required prior to the scan. The patient is placed in supine position with the neck slightly extended. The Doppler spectrum of the inferior thyroid artery is acquired before branching.

7.2\ Section Structure

Spectral Doppler shows as low resistance type, unidirectional pulsatile spectrum, with a rapid rise at systole and slow decline to low amplitude blood flow at diastole.

7.3\ Measuring Method

and Normal Value

The peak systolic velocity of the inferior thyroid artery is 30–50 cm/s, RI < 0.7.

7.4\ The Clinical Application Value

To diagnose the diffuse toxic goiter and to monitor the treatment effect of hyperthyroidism