Comparative dose levels between CT-scanner and slot-scanning device (EOS system) in pregnant women pelvimetry. (January 2017)

• Record Type: Journal Article
• Authors: Ben Abdennebi, A.; Aubry, S.; Ounalli, L.; Fayache, M.S.; Delabrousse, E.; Petegnief, Y.
• Is Part Of: Physica medica. Volume 33(2017)
• Page Start: 77
• Page End: 86
• Publication Date: 2017-01
• Subjects: EOS imaging system -- CT-scanner -- OSLD NanoDot -- Monte Carlo; Medical physics -- Periodicals; Biophysics -- Periodicals; Biophysics -- Periodicals; Imagerie médicale -- Périodiques; Radiothérapie -- Périodiques; Rayons X -- Sécurité -- Mesures -- Périodiques; Physique -- Périodiques; Médecine -- Périodiques; 610.153
• DOI: 10.1016/j.ejmp.2016.12.008
• Languages: English
• ISSNs: 1120-1797

Abstract

Highlights: A comparison between the EOS imaging system and CT scanner is proposed. The comparison leads to lower doses with EOS imaging system than with CT scanner. The EOS system is less irradiating than the CT-scan in the out-of-field region. The EOS system may have an advantage by reducing effective doses in radio-sensitive organs. Abstract: Purpose: To estimate fetal absorbed doses for pregnant women pelvimetry, a comparative study between EOS imaging system and low-dose spiral CT-scanner was carried out. For this purpose three different studies were investigated: in vivo, in vitro and Monte Carlo calculations. Methods: In vivo dosimetry was performed, using OSL NanoDot dosimeters, to determine the dose to the skin of twenty pregnant women. In vitro studies were established by using a cubic phantom of water, in order to estimate the out of field doses. In the latter study, OSLDs were placed at depths corresponding to the lowest, average and highest position of the uterus. Monte Carlo calculations of effective doses to high radio-sensitive organs were established, using PCXMC and CTExpo software suites for EOS imaging system and CT-scanner, respectively. Results: The EOS imaging system reduces radiation exposure 4 to 8 times compared to the CT-scanner. The entrance skin doses were 74% (p-values <0.01) higher with the CT-scanner than with the EOS system. In the out of field region, the measured doses of the EOS system were reduced by 80% (p-values <0.02). Monte Carlo calculations confirmed that effective doses to organs are less accentuated for EOS than for CT pelvimetry. Conclusions: The EOS system is less irradiating than the CT exam. The out-of-field dose which is significant, is lower in the EOS than in the CT-scanner and could be reduced even further by optimizing the time used for image acquisition.