Uncertainties in determination of 131I activity in thyroid gland

Ośko, Jakub; Golnik, N.; Pliszczyński, Tomasz

doi:10.1093/rpd/ncm158

Cited by 9 publications

(4 citation statements)

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“…The influence of other parameters such as vertical and horizontal shifts of the source from the detector axis are described elsewhere [1,3].…”

Section: Resultsmentioning

confidence: 99%

“…The most important application are measurements of iodine uptake by patients with thyroid diseases. The P/C ratio can be used for selecting a group of patients for whom the anatomical position of the thyroid or the spatial distribution of the iodine accumulated is very much different from the standard distribution assumed during the calibration of the counters [1][2][3]. Standard measurements in this case give incorrect results.…”

Section: Resultsmentioning

confidence: 99%

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Spectrometric measurements of radioisotope activity in the thyroid

Ośko¹,

Golnik²

2008

Polish Journal of Medical Physics and Engineering

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The results of measurements of iodine 131 I and technetium 99m Tc uptake in human thyroid, performed with scintillation or semiconductor detectors can exhibit a considerable uncertainty due to the differences in the thyroid position in the patient's neck. Basic physical laws of radiation attenuation and scattering show that the final shape of the registered spectrum should depends on the thyroid position in the neck and on the thickness of the tissue between the thyroid and the detector. The use of the spectrometric measuring method is proposed in this work for determination of the iodine gathering effective depth. The performed studies showed that the measurements results can be used for improving the accuracy of the iodine 131 I activity in thyroid measurements and for selection of the group of patients for whom the anatomical position of the thyroid or the spatial distribution of the iodine gathering is much different than the standard one, assumed during the calibration of the counters. The results of the measurements were in agreement with Monte-Carlo calculations of the detector response. The method was used in routine monitoring of occupationally exposed persons, using the thyroid counter. A group of six persons with measurable internal contamination was selected and the measurements were performed on consecutive days, so the results could be registered at decreasing iodine activities in the thyroid. Larger series of measurements were performed at Brodno Regional Hospital in Warsaw, for a group of 95 patients after diagnostic administration of iodine 131 I.

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“…The influence of other parameters such as vertical and horizontal shifts of the source from the detector axis are described elsewhere [1,3].…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Spectrometric measurements of radioisotope activity in the thyroid

Ośko¹,

Golnik²

2008

Polish Journal of Medical Physics and Engineering

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“…pomiarów skażeń tarczycy jodem promieniotwórczym za pomocą licznika promieniowania tarczycy. Kalibrację licznika można wykonać za pomocą fantomów pozwalających na symulowanie różnego położenia tarczycy w szyi człowieka [4,5].…”

Section: Wnioskiunclassified

Estimation of internal radiation exposure using a whole body counter

Pliszczyński¹,

Ośko²,

Ciszewska³

et al. 2011

Polish Journal of Medical Physics and Engineering

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Ocena narażenia wewnętrznego za pomocą licznika promieniowania ciała człowieka Proces oceny narażenia wewnętrznego na skażenia substancjami promieniotwórczymi jest skomplikowany i towarzyszy mu wiele czynników, które są źródłem niepewności szacowania obciążającej dawki efektywnej. W niniejszym artykule przedstawiono sposób właściwego postępowania podczas szacowania obciążającej dawki efektywnej za pomocą Licznika Promieniowania Ciała Człowieka.

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“…size, shape, etc.) and the position of each organ in human body [ 1 – 3 ]. The thyroid was chosen as an object of measurements.…”

Section: Introductionmentioning

confidence: 99%

Variation of counting efficiency in determination of 131I activity in the thyroid gland as a result of its position relative to the detector

Kierepko

Janowski

Grochowska

2014

J Radioanal Nucl Chem

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The appropriate determination of the 131I which was absorbed into the human body, especially by thyroid, depends not only on individual features of each measurement subjects but also on reproducibility of their position or the thyroid’s position in the human neck. Possible uncertainties caused by changes of the thyroid position relative to detector were studied in a series of measurements. The research has shown that the dispersion of the results can reach up even to the level of 50 %.

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Uncertainties in determination of 131I activity in thyroid gland

Cited by 9 publications

References 0 publications

Spectrometric measurements of radioisotope activity in the thyroid

Spectrometric measurements of radioisotope activity in the thyroid

Estimation of internal radiation exposure using a whole body counter

Variation of counting efficiency in determination of 131I activity in the thyroid gland as a result of its position relative to the detector

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