1. Perros P, Boelaert K, Colley S, Evans C, Evans RM, Gerrard Ba G (2014) Guidelines for the management of thyroid cancer. Clin Endocrinol (Oxf) 81(Suppl 1):1–122
2. Kim EK, Park CS, Chung WY, Oh KK, Kim DI, Lee JT et al (2002) New sonographic criteria for recommending fine-needle aspiration biopsy of nonpalpable solid nodules of the thyroid. AJR Am J Roentgenol 178:687–691
3. Gibbs V, Cole D, Sassano A (2009) Relationship between spatial pulse length and bandwidth. In: Gibbs V, Cole D, Sassano A (eds) Ultrasound physics and technology: how, why and when, 1st edn. Churchill Livingstone, Elsevier, p 31
4. Dean CR (2011) Spatial and frequency compounding. In: Allan PL, Baxter GM, Weston MJ (eds) Clinical ultrasound, 3rd edn. Elsevier, Churchill Livingstone, pp 37–38
5. Dean CR (2011) Adaptive processing. In: Allan PL, Baxter GM, Weston MJ (eds) Clinical ultrasound, 3rd edn. Elsevier, Churchill Livingstone, pp 38–40