Radiation dose and in vitro precision in paediatric bone mineral density measurement using dual X-ray absorptiometry

C. F. Njeh, Supian Samat, A. Nightingale, E. A. McNeil, C. M. Boivin

Research output: Contribution to journalArticle

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Abstract

Dual X-ray absorptiometry (DXA) is one of the most widely used techniques for noninvasive assessment of bone integrity. There is a growing demand for measurement of paediatric bone status. In DXA the principal radiation risks to patients are the carcinogenic and genetic effects. Radiation dosimetry is well established for DXA in adults, but there are limited paediatric data available. We report on a study to estimate the effective doses (EDs) received by typical 5 and 10 year-old children using the paediatric scan mode on the Lunar DPX-L bone mineral density scanner. Entrance surface doses (ESDs) and percentage depth doses for the total body and PA spine scan modes were measured using lithium berate thermoluminescent dosemeters (TLDs) located at the surface and distributed at various organ locations in anthropomorphic child phantoms. The EDs were calculated from the percentage depth doses, amount of each organ irradiated and tissue weighting factors. The ESDs were measured to be 6.0 and 0.12 μGy for the posteroanterior (PA) spine and total body, respectively. PA spine EDs were calculated as 0.28 and 0.20 μSv for the 5 and l0 year-old, respectively. Total body EDs were 0.03 and 0.02 μSv for the 5 and 10 year-old children, respectively. These results compare with an adult ED of 0.21 μSv for the PA spine. They are also more than two orders of magnitude lower than reported ESDs and EDs for paediatric chest X-rays. Bone mineral density (BMD) short-term in vitro precision was 0.5% and 1% in the 5 and l0 year-old phantoms, respectively. In conclusion, the Lunar DPX-L in the paediatric mode has a high precision and very low radiation doses, similar to those reported for the adult mode.

Original languageEnglish
Pages (from-to)719-727
Number of pages9
JournalBritish Journal of Radiology
Volume70
Issue numberJULY
Publication statusPublished - Jul 1997
Externally publishedYes

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Photon Absorptiometry
Bone Density
Radiation
Pediatrics
Spine
Radiometry
Bone and Bones
Thromboplastin
Lithium
Thorax
X-Rays
In Vitro Techniques

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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Radiation dose and in vitro precision in paediatric bone mineral density measurement using dual X-ray absorptiometry. / Njeh, C. F.; Samat, Supian; Nightingale, A.; McNeil, E. A.; Boivin, C. M.

In: British Journal of Radiology, Vol. 70, No. JULY, 07.1997, p. 719-727.

Research output: Contribution to journalArticle

Njeh, C. F. ; Samat, Supian ; Nightingale, A. ; McNeil, E. A. ; Boivin, C. M. / Radiation dose and in vitro precision in paediatric bone mineral density measurement using dual X-ray absorptiometry. In: British Journal of Radiology. 1997 ; Vol. 70, No. JULY. pp. 719-727.
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