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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
(A) A hybrid image of the head and neck phantom; (B) gamma image of three simulated parotid SLNs; (C) gamma image of simulated superficial cervical SLN; (D) gamma image of the thyroid phantom filled with 5 MBq of 99mTc activity.