False-positive I-131 distribution caused by residual I-131 in the face mask NQJ
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(2) Japanese Archive of cases conference of clinical nuclear medicine 02, 2020. P. 11. Key words Face mask, False-positive distribution, 131I scintigraphy Ethical comments Written informed consent was obtained from all individual participants included in this study in accordance with the Code of Ethics of the World Medical Association. All procedures performed in this retrospective study were in accordance with the ethical standards of our institutional research committee and with the principles of the 1964 Declaration of Helsinki and its later amendments our comparable ethical standards. Conflicts of interest None.
(3) Japanese Archive of cases conference of clinical nuclear medicine 02, 2020. P. 12. Fig.1 A 70-year-old patient who underwent 131I radioiodine remnant ablation at our hospital after thyroid cancer had undergone total thyroidectomy and received 131I scintillation 10 days after administration. A whole body image of 131I scintigraphy showed abnormal accumulation in the left precordial region.. Fig.2 Although no CT metastasis was observed in the chest CT at the time of the first visit, the possibility of metastasis cannot be ruled out, and the abnormal accumulation disappeared in the additional SPECT Maximum Intensity Projection（MIP） image..
(4) Japanese Archive of cases conference of clinical nuclear medicine 02, 2020. P. 13. Fig.3 The patient was wearing a mask, and the mask was removed during the whole body scan and placed in a chest pocket.. Fig.4 when the mask was imaged with a scinti camera, an abnormal distribution was observed. 131I is also released in exhaled breath[1,2]. This abnormal distribution was considered to be 131I in the exhaled air remaining in the mask. Since the epidemic of coronavirus infection, most people have started to wear face masks regularly. Even if the patient taking the 131I scintigraphy has the face mask removed, it is necessary to confirm the presence and location of the face mask before imaging..
(5) Japanese Archive of cases conference of clinical nuclear medicine 02, 2020. P. 14. References 1. Schomacker K, Sudbrock F, Fischer T, Dietlein M, Kobe C, Gaidouk M, et al. Exhalation of (1)(3)(1)I after radioiodine therapy: measurements in exhaled air. Eur J Nucl Med Mol Imaging. 2011;38:2165-72. doi:10.1007/s00259-011-1888-8. 2. Sudbrock F, Fischer T, Zimmermanns B, Drzezga A, Schomacker K. Exhalation of (131)I after radioiodine therapy: Dosimetric considerations based on measurements in exhaled air. J Environ Radioact. 2017;166:162-5. doi:10.1016/j.jenvrad.2016.06.024..
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