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Proceedings Paper

Dual-energy computed tomography of the head: a phantom study assessing axial dose distribution, eye lens dose, and image noise level
Author(s): Kosuke Matsubara; Hiroki Kawashima; Takashi Hamaguchi; Tadanori Takata; Masanao Kobayashi; Katsuhiro Ichikawa; Kichiro Koshida
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Paper Abstract

The aim of this study was to propose a calibration method for small dosimeters to measure absorbed doses during dual- source dual-energy computed tomography (DECT) and to compare the axial dose distribution, eye lens dose, and image noise level between DE and standard, single-energy (SE) head CT angiography. Three DE (100/Sn140 kVp 80/Sn140 kVp, and 140/80 kVp) and one SE (120 kVp) acquisitions were performed using a second-generation dual-source CT device and a female head phantom, with an equivalent volumetric CT dose index. The axial absorbed dose distribution at the orbital level and the absorbed doses for the eye lens were measured using radiophotoluminescent glass dosimeters. CT attenuation numbers were obtained in the DE composite images and the SE images of the phantom at the orbital level. The doses absorbed at the orbital level and in the eye lens were lower and standard deviations for the CT attenuation numbers were slightly higher in the DE acquisitions than those in the SE acquisition. The anterior surface dose was especially higher in the SE acquisition than that in the DE acquisitions. Thus, DE head CT angiography can be performed with a radiation dose lower than that required for a standard SE head CT angiography, with a slight increase in the image noise level. The 100/Sn140 kVp acquisition revealed the most balanced axial dose distribution. In addition, our proposed method was effective for calibrating small dosimeters to measure absorbed doses in DECT.

Paper Details

Date Published: 30 March 2016
PDF: 8 pages
Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 978347 (30 March 2016); doi: 10.1117/12.2216650
Show Author Affiliations
Kosuke Matsubara, Kanazawa Univ. (Japan)
Hiroki Kawashima, Kanazawa Univ. (Japan)
Takashi Hamaguchi, Kanazawa Univ. Hospital (Japan)
Tadanori Takata, Kanazawa Univ. (Japan)
Masanao Kobayashi, Fujita Health Univ. (Japan)
Katsuhiro Ichikawa, Kanazawa Univ. (Japan)
Kichiro Koshida, Kanazawa Univ. (Japan)

Published in SPIE Proceedings Vol. 9783:
Medical Imaging 2016: Physics of Medical Imaging
Despina Kontos; Thomas G. Flohr, Editor(s)

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