Comparison of Ultrasound with other Types of Thyroid Imaging
Imaging of the thyroid gland began in 1951 when the first scanner was developed at the University of California, Los Angeles, by Cassen and Curtis (1). Thyroid scintigraphy using a radioactive isotope remained the primary method of imaging the thyroid for over a quarter of a century. It provided both an anatomical and functional image of the thyroid gland. The development of high-resolution realtime ultrasound, computed tomography (CT), and magnetic resonance imaging (MRI) now offers alternative means to visualize thyroid anatomy. While the recent development of single photon emission computed tomography (SPECT) and positron emission tomography (PET) have the potential to measure tissue function as well as anatomy, the use for that purpose remains experimental and is not widely available. Although ultrasound demonstrates only thyroid anatomy and not thyroid function, it has emerged as the most widely used method of thyroid imaging. This chapter will concentrate on comparing the advantages and disadvantages of ultrasound with isotope scans, CT, and MRI.
KeywordsThyroid Cancer Thyroid Nodule Thyroid Tissue Radioiodine Uptake Thyroid Scintigraphy
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