| A retrospective study on the transition of radiation dose rate and iodine distribution in patients with I-131-treated well-differentiated thyroid cancer to improve bed control shorten isolation periods. | |
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MedLine Citation:
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PMID: 22382609 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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OBJECTIVE: To evaluate for how long patients should be isolated after I-131 treatment for thyroid cancer according to the guidelines issued by the Japanese Ministry of Welfare. METHODS: We reviewed 92 therapies performed in 76 patients who were administered I-131 at our hospital from July 2007 to September 2009. Fifty-six patients were given 2220 or 2960 MBq I-131 at the first therapy, and 29 patients underwent 36 repeated therapies using 2960, 3700, 5550 or 7400 MBq I-131. We surveyed radioactivity for a 1 cm dose equivalent rate at 1 m intervals at 30 and 48 h after administration of I-131, obtained planar scintigrams at 48 h, and surveyed radioactivity repeatedly until it fell to under 30 μSv/h. RESULTS: The radioactivity was under 30 μSv/h at 30 h in 51 out of 92 cases (55%). Among the remaining 41 (45%) cases, 27 (29%) and 32 (35%) cases showed decreased radioactivity under 30 μSv/h at 48 and 72 h, respectively, and it remained higher than 30 μSv/h at 72 h in another 9 cases (10%). In 5 (38%) of the 13 cases with bone metastasis, the radioactivity remained over 30 μSv/h after 72 h, and scintigrams showed strong accumulation in bone metastases. Among the 27 cases demonstrating below 30 μSv/h at 48 h, 26 showed radioactivity being below 50 μSv/h at 30 h, while it was above 50 μSv/h at 30 h in all 14 cases which demonstrated above 30 μSv/h at 48 h. We compared the radioactivity levels of 27 cases under 30 μSv/h at 48 h and 14 cases over 30 μSv/h at 48 h using a cutoff value of under 50 μSv/h at 30 h to release patient at 48 h, the positive predictive value and negative predictive value were 100 and 93%, respectively, and radioactivity was found to differ significantly (P < 0.001). CONCLUSIONS: To predict external radiation levels at 48 h, it is helpful to consider external radiation levels at 30 h after treatment. Consideration of intracellular uptake in thyroid cancer, especially in cases of bone metastases, digestive tract function, and renal function, is important for predicting isolated period. |
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Authors:
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Naoya Yama; Koh-Ichi Sakata; Hideki Hyodoh; Mitsuharu Tamakawa; Masato Hareyama |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-3-3 |
Journal Detail:
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Title: Annals of nuclear medicine Volume: - ISSN: 1864-6433 ISO Abbreviation: - Publication Date: 2012 Mar |
Date Detail:
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Created Date: 2012-3-2 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8913398 Medline TA: Ann Nucl Med Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Radiology, Sapporo Medical University, S-1 W-16, Chuo-Ku, Sapporo, 060-8543, Japan, nyama@sapmed.ac.jp. |
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