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Ionizing radiation doses during lower limb torsion and anteversion measurements by EOS stereoradiography and computed tomography.

Abstract：

OBJECTIVES:To calculate and compare the doses of ionizing radiation delivered to the organs by computed tomography (CT) and stereoradiography (SR) during measurements of lower limb torsion and anteversion. MATERIALS AND METHODS:A Rando anthropomorphic phantom (Alderson RANDO phantom, Alderson Research Laboratories Inc., Stanford, Conn) was used for the dose measurements. The doses were delivered by a Somatom 16-slice CT-scanner (Siemens, Erlangen) and an EOS stereoradiography unit (EOS-Imaging, Paris) according to the manufacturers' acquisition protocols. Doses to the surface and deeper layers were calculated with thermoluminiscent GR207P dosimeters. Dose uncertainties were evaluated and assessed at 6% at k=2 (that is, two standard deviations). RESULTS:The absorbed doses for the principal organs assessed were as follows: for the ovaries, 0.1 mGy to the right ovary and 0.5 mGy to the left ovary with SR versus 1.3 mGy and 1.1 mGy with CT, respectively; testes, 0.3 mGy on the right and 0.4 mGy on the left with SR versus 8.5 mGy and 8.4 mGy with CT; knees, 0.4 mGy to the right knee and 0.8 mGy to the left knee with SR versus 11 mGy and 10.4 mGy with CT; ankles, 0.5 mGy to the right ankle and 0.8 mGy to the left with SR versus 15 mGy with CT. CONCLUSION:The SR system delivered substantially lower doses of ionizing radiation doses than CT to all the organs studied: CT doses were 4.1 times higher to the ovaries, 24 times higher for the testicles, and 13-30 times higher for the knees and ankles. The use of the SR system to study the torsion of lower limbs makes it possible to reduce the amount of medical irradiation that patients accumulate.

journal_name

Eur J Radiol

journal_title

European journal of radiology

authors

Delin C,Silvera S,Bassinet C,Thelen P,Rehel JL,Legmann P,Folinais D

doi

10.1016/j.ejrad.2013.10.026

subject

Has Abstract

pub_date

2014-02-01 00:00:00

pages

371-7

issue

2

eissn

0720-048X

issn

1872-7727

pii

S0720-048X(13)00583-4

journal_volume

83

pub_type

杂志文章

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