Dual-energy computed tomography of the head: a phantom study assessing axial dose distribution, eye lens dose, and image noise level

Kosuke Matsubara; Hiroki Kawashima; Takashi Hamaguchi; Tadanori Takata; Masanao Kobayashi; Katsuhiro Ichikawa; Kichiro Koshida

doi:10.1117/12.2216650

30 March 2016 Dual-energy computed tomography of the head: a phantom study assessing axial dose distribution, eye lens dose, and image noise level

Kosuke Matsubara, Hiroki Kawashima, Takashi Hamaguchi, Tadanori Takata, Masanao Kobayashi, Katsuhiro Ichikawa, Kichiro Koshida

Author Affiliations +

Proceedings Volume 9783, Medical Imaging 2016: Physics of Medical Imaging; 978347 (2016) https://doi.org/10.1117/12.2216650
Event: SPIE Medical Imaging, 2016, San Diego, California, United States

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.

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Kosuke Matsubara, Hiroki Kawashima, Takashi Hamaguchi, Tadanori Takata, Masanao Kobayashi, Katsuhiro Ichikawa, and Kichiro Koshida "Dual-energy computed tomography of the head: a phantom study assessing axial dose distribution, eye lens dose, and image noise level", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 978347 (30 March 2016); https://doi.org/10.1117/12.2216650

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KEYWORDS

Head

Eye

Calibration

X-ray computed tomography

Computed tomography

X-rays

Angiography

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