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Doppler Ultrasound

  • Robert A. LevineEmail author
Chapter

Abstract

The Doppler shift is a change in frequency that occurs when sound (or light) is emitted from, or bounced off of, a moving object. The role of Doppler ultrasound in thyroid imaging has recently experienced a significant change. The prior belief that power Doppler imaging plays an important role in the prediction of the likelihood of malignancy in a thyroid nodule has undergone a reassessment. Most of the prior guidelines for management of thyroid nodules considered vascularity as a risk factor for malignancy. More recent studies suggest that vascularity does not have a significant predictive value in most thyroid nodules. Most guidelines still recommend documentation of vascularity in all significant thyroid nodules but do not consider vascularity as a factor determining the need for biopsy. An absent flow pattern does not have sufficient predictive value to eliminate the need to biopsy an avascular solid nodule. Doppler imaging is useful in the evaluation of goiter, thyroid nodules, lymph nodes, and parathyroid glands.

Keywords

Doppler shift Color Doppler Power Doppler Vascularity Thyroid nodules Probability of malignancy Amiodarone-induced thyrotoxicosis Graves’ disease Destructive thyroiditis Postpartum thyroiditis 

Abbreviations

AACE

American Association of Clinical Endocrinologists

AME

Associazione Medici Endocrinologi

ATA

American Thyroid Association

GD

Graves’ disease

PI

Pulsatility index

PPV

Positive predictive value

PRF

Pulse repetition frequency

PSV

Peak systolic velocity

RAIU

Radioactive iodine uptake

RI

Resistive index

RR

Relative risk

TBFA

Thyroid blood flow area

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.Geisel School of Medicine at Dartmouth College, Thyroid Center of New Hampshire, St. Joseph HospitalNashuaUSA

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