Diagnostic Imaging of the Thyroid and Radioiodine Therapy
According to its superficial anatomic location, the thyroid gland may easily be assessed by sonography. Linear transducers with a width of 7.5–9 cm and frequencies of around 10 MHz are used. Sonography of the thyroid gland should also always be combined with a sonography of the surrounding soft tissues and of the cervical vessels. It allows the exact measurement of the thyroid volume and assessment of the parenchymal texture of the thyroid gland with identification of diffuse or focal abnormalities of the gland itself and of potential abnormalities within the surrounding structures.
Compared to other imaging modalities, thyroid sonography offers the best spatial resolution. Lateral resolution is 0.5–1 mm, and this is also valid for tiny calcifications. For solid or cystic lesions, the detection levels are 2 mm. By using the combination with colour Doppler sonography, additional information may be achieved regarding the local perfusion in focal or diffuse abnormalities.
KeywordsThyroid Cancer Thyroid Gland Thyroid Nodule Papillary Carcinoma Multinodular Goitre
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