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Sergey Nikolaevich Novikov,Pavel Ivanovich Krzhivitskii,Zamira Achmedovna Radgabova,Maxim Andreevitch Kotov,Mikhail Markovich Girshovich,Anna Sergeevna Artemyeva,Yulia Sergeevna Melnik,Sergey Vasilevi 대한방사선종양학회 2021 Radiation Oncology Journal Vol.39 No.3
Purpose: To evaluate correlation of single photon emission computed tomography-computed tomography (SPECT-CT) data on lymph flow (LF) from oral tongue cancer (OC) and the topography of lymph nodes (LN) metastases; to determine the clinical value of lymph flow guided radiotherapy (LFGRT). Materials and Methods: SPECT-CT visualization of LF from the OC lesions was performed after peritumoral injection of 99mTc-phytate in 26 primary patients with clinical stage cT1-2N0M0 disease. We determined the individual drainage (unilateral/bilateral) from the tumor, and localization of sentinel LNs according to the neck levels. Metastases in LNs were verified with histology and a 2-year follow-up. Results: SPECT-CT detected bilateral LF in 10 (38.5%) of 26 patients; in 16 (61.5%) cases the drainage was unilateral. Histology revealed LNs metastases in three cases; regional recurrences were diagnosed in other four patients. In all seven observations metastases were located at the same site and level as the sentinel LNs. In eight (30.8%) of 26 patients sentinel LNs were visualized unilaterally at levels Ib-IIa; in five cases, unilaterally at levels I-IIa-III. In these patients, LFGRT demonstrated 59%-70% reduction of irradiated volume, and 26%-42% and 51%-70% decrease of the mean dose to the spinal cord and the contralateral parotid gland. In patients with a bilateral drainage the reduction of doses absorbed by the spinal cord and contralateral parotid gland was 19% and 6%, respectively. Conclusion: Localization of sentinel LNs determined by SPECT-CT corresponds to the localization of metastatic LNs in terms of side and levels.
Nguyen Van Minh,Yury Konyukhov,Gopalu Karunakaran,Dmitry Ryzhonkov,Tang Duong,Sergey Kotov,Denis Kuznetsov 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
In the present study, the influence of nano additives (Ni, Fe) and different mixing (turbular and magnetic) on thedensification, microstructure and micro-hardness of the tungsten material under spark plasma sintering is analyzed. After turbulent mixing the nanoparticles are distributed widely in the W interparticle gaps but after magneticmixing the nanoparticles are distributed not only on the gaps of the W particles but also on the broken surfaces. Niincorporated tungsten materials achieved the maximum density of 98.3% at 1400 °C (turbular mixing) and 97.9%at 1300 °C (magnetic mixing). Fe incorporated tungsten material showed density of 97.7% at 1600 °C and 97.2%at 1400 °C after turbular and magnetic mixing. The influence of nanoparticles in the densification process wasexplained by Laplace force, boundary slip and Agte-Vacek effect. The microstructural analysis showed that nanomodificationreduced the degree of porosity, and provides a compact material at low temperatures. X-ray fluorescenceanalysis reveals that magnetic mixing shows more uniform distribution of nanoparticles than turbular mixing. Thenanoparticles incorporation increased the micro hardness of tungsten material. Hence, it is clear that magnetic mixingand nano modification greatly improved the densification and sintering behavior of the tungsten material.