Infinia hawkeye spect ct

The SLNB technique initially used intradermal injections of vital blue dye and was later modified with the addition of radiolabeled colloid injections at the site of the primary cutaneous melanoma. Lymphoscintigraphy was performed with intradermal injection of 55 MBq of Technetium-99 m-nanocolloid (Nanocoll, GE Healthcare, Gipharma, Saluggia, VR, Italy; 2019–2021: Nanotop, Rotop Parmaka Gmbh, Dresden, Germany) the same day of the surgical procedure. The colloid was injected in a total volume of 0.4 mL in four intradermal deposits of 0.1 mL each, which were located on both sides of the surgical scar. Dynamic images of the corresponding anatomical region and their adjacent lymphatic basins were acquired at 30 s per frame for 5 min with a total of 10 frames. Afterwards, anterior, lateral, and oblique projections were acquired for 5 min each, using a dual-detector gamma camera. The studies were integrated with a SPECT-CT acquisition (GE Infinia Hawkeye SPECT-CT). Images of each patient were reviewed by the operating surgeon and the nuclear medicine specialist.

An Infinia Hawkeye SPECT/CT (GE Medical system, Haifa, Israel) was used for scintigraphy. Twenty patients were injected with 111–185 MBq (3–5 mCi) of ^99mTcO4⁻ intravenously 20 min before imaging. Another 2 patients were orally administered 3.7 or 5.5 MBq (100 or 150 μCi) of ¹³¹I 48 h before imaging. The scan parameters were: low-energy high resolution collimators for ^99mTcO4⁻ imaging, and high-energy general purpose for ¹³¹I imaging; and total time of 5 min using body contour (256 × 256 matrix). The imaging was completed with a spot view from the base of skull to the upper mediastinum in anterior projections. SPECT/CT was performed in 5 patients (5 masses) during the same session as scintigraphy with the patient in the same position. A SPECT study with a matrix of 128 × 128 was acquired; zoom factor of 1.2 to 1.5, according to the individual patient; and a rotation of 360° (180° per head) 30-s images (1 image every 6°). The CT was acquired in helical mode with a matrix of 512 × 512 and energy of 2.5 mA and 140 kV.