Patients received 20 MBq of 123I intravenously. Two hours later, 750 MBq of 99mTc-sestamibi was injected. SPECT/CT acquisition was started 10 minutes after the 99mTc-sestamibi administration. All SPECT/CT acquisitions were performed with Siemens Symbia T or Siemens Intevo T2 imaging systems (Siemens, Erlangen, Germany). Immediately after the SPECT/CT acquisition, a static pinhole image of the neck was acquired with a SKYLight gamma camera (Philips Healthcare, USA) or with Siemens Symbia or Intevo T2 systems (Siemens, Erlangen, Germany) beginning in 2015. All acquisition parameters are shown in Table 1.
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