Effect of patient size on radiation dose for abdominal MDCT with automatic tube current modulation: phantom study

AJR. American Journal of Roentgenology
Sebastian T SchinderaTerry T Yoshizumi

Abstract

The purpose of this study was to evaluate in a phantom study the effect of patient size on radiation dose for abdominal MDCT with automatic tube current modulation. One or two 4-cm-thick circumferential layers of fat-equivalent material were added to the abdomen of an anthropomorphic phantom to simulate patients of three sizes: small (cross-sectional dimensions, 18 x 22 cm), average size (26 x 30 cm), and oversize (34 x 38 cm). Imaging was performed with a 64-MDCT scanner with combined z-axis and xy-axis tube current modulation according to two protocols: protocol A had a noise index of 12.5 H, and protocol B, 15.0 H. Radiation doses to three abdominal organs and the skin were assessed. Image noise also was measured. Despite increasing patient size, the image noise measured was similar for protocol A (range, 11.7-12.2 H) and protocol B (range, 13.9-14.8 H) (p > 0.05). With the two protocols, in comparison with the dose of the small patient, the abdominal organ doses of the average-sized patient and the oversized patient increased 161.5-190.6%and 426.9-528.1%, respectively (p < 0.001). The skin dose increased as much as 268.6% for the average-sized patient and 816.3% for the oversized patient compared with the small patient (p <...Continue Reading

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Citations

Jul 24, 2008·Pediatric Radiology·Melanie P Hiorns
Aug 28, 2013·Abdominal Imaging·Tessa S CookNicholas Papanicolaou
Mar 25, 2010·Radiation Protection Dosimetry·Francis ZarbMark F McEntee
Sep 23, 2009·AJR. American Journal of Roentgenology·Tracy A JaffeCarl E Ravin
Jun 23, 2010·AJR. American Journal of Roentgenology·Avinash R KambadakoneDushyant V Sahani
May 22, 2010·AJR. American Journal of Roentgenology·Patricia L KleinmanGeorge A Taylor
Apr 27, 2013·AJR. American Journal of Roentgenology·Michael D BelandWilliam W Mayo-Smith
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