First experience of SPECT-CT with the radiopharmaceutical Thallium-199 chloride in diagnosis and assessment of the metastatic spread of lung cancer
Abstract
Introduction. The development and improvement of new tomographic technologies for highly sensitive imaging of lung cancer (LC) is crucial for the early detection of this disease, accurate staging and control of complex therapy.The purpose of the study. To study the possibility of using the radiopharmaceutical (rp) 199TlCl for SPECT-CT imaging of LC.Material and methods. 199TlCl in solution was obtained at the U-120 cyclotron (Efremov Institute of Physics and Technology, Rosatom, St. Petersburg) of the TPU Institute of Physics and Technology by the reaction of irradiation of a metal gold target with alpha particles 197Au(α,2n)199Tl, at an alpha particle energy of 28 MeV, with a 199Tl yield of over 95%, in saline solution. The injected dose of rp was 180–185 MBq in all cases, and the scan was performed in 12–20 minutes after the injection of 199TlCl. The chest SPECT was acquired as 64 planar scans per 360° rotation of the two-detector system, in a 64 × 64 matrix, with a field of view size of 40 × 40 cm, with acquisition of more than 50,000 pulses per frame, with a high-energy high-resolution collimator installed, with an energy peak of 70 keV set at a window width of 20% of the differential discriminator. The axial sections were reconstructed using the back-projection method, taking into account the depth absorption with an absorption constant of 0.12 1 / cm. The contour of the patient's body for this purpose was imported from the CT. CT of chest was carried out immediately…
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