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

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

Medical Imaging Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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.

Original language	English
Title of host publication	Medical Imaging 2016
Subtitle of host publication	Physics of Medical Imaging
Editors	Despina Kontos, Joseph Y. Lo, Thomas G. Flohr
Publisher	SPIE
ISBN (Electronic)	9781510600188
DOIs	https://doi.org/10.1117/12.2216650
Publication status	Published - 2016
Event	Medical Imaging 2016: Physics of Medical Imaging - San Diego, United States Duration: 28-02-2016 → 02-03-2016

Publication series

Name	Progress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume	9783
ISSN (Print)	1605-7422

Other

Other	Medical Imaging 2016: Physics of Medical Imaging
Country/Territory	United States
City	San Diego
Period	28-02-16 → 02-03-16

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Biomaterials
Atomic and Molecular Physics, and Optics
Radiology Nuclear Medicine and imaging

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10.1117/12.2216650

Cite this

Matsubara, K., Kawashima, H., Hamaguchi, T., Takata, T., Kobayashi, M., Ichikawa, K., & Koshida, K. (2016). Dual-energy computed tomography of the head: A phantom study assessing axial dose distribution, eye lens dose, and image noise level. In D. Kontos, J. Y. Lo, & T. G. Flohr (Eds.), Medical Imaging 2016: Physics of Medical Imaging Article 978347 (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 9783). SPIE. https://doi.org/10.1117/12.2216650

Matsubara, Kosuke ; Kawashima, Hiroki ; Hamaguchi, Takashi et al. / Dual-energy computed tomography of the head : A phantom study assessing axial dose distribution, eye lens dose, and image noise level. Medical Imaging 2016: Physics of Medical Imaging. editor / Despina Kontos ; Joseph Y. Lo ; Thomas G. Flohr. SPIE, 2016. (Progress in Biomedical Optics and Imaging - Proceedings of SPIE).

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

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.",

author = "Kosuke Matsubara and Hiroki Kawashima and Takashi Hamaguchi and Tadanori Takata and Masanao Kobayashi and Katsuhiro Ichikawa and Kichiro Koshida",

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year = "2016",

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language = "English",

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Matsubara, K, Kawashima, H, Hamaguchi, T, Takata, T, Kobayashi, M, Ichikawa, K & Koshida, K 2016, Dual-energy computed tomography of the head: A phantom study assessing axial dose distribution, eye lens dose, and image noise level. in D Kontos, JY Lo & TG Flohr (eds), Medical Imaging 2016: Physics of Medical Imaging., 978347, Progress in Biomedical Optics and Imaging - Proceedings of SPIE, vol. 9783, SPIE, Medical Imaging 2016: Physics of Medical Imaging, San Diego, United States, 28-02-16. https://doi.org/10.1117/12.2216650

Dual-energy computed tomography of the head: A phantom study assessing axial dose distribution, eye lens dose, and image noise level. / Matsubara, Kosuke; Kawashima, Hiroki; Hamaguchi, Takashi et al.
Medical Imaging 2016: Physics of Medical Imaging. ed. / Despina Kontos; Joseph Y. Lo; Thomas G. Flohr. SPIE, 2016. 978347 (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 9783).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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T1 - Dual-energy computed tomography of the head

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AU - Matsubara, Kosuke

AU - Kawashima, Hiroki

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AU - Kobayashi, Masanao

AU - Ichikawa, Katsuhiro

AU - Koshida, Kichiro

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N2 - 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.

AB - 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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ER -

Matsubara K, Kawashima H, Hamaguchi T, Takata T, Kobayashi M, Ichikawa K et al. Dual-energy computed tomography of the head: A phantom study assessing axial dose distribution, eye lens dose, and image noise level. In Kontos D, Lo JY, Flohr TG, editors, Medical Imaging 2016: Physics of Medical Imaging. SPIE. 2016. 978347. (Progress in Biomedical Optics and Imaging - Proceedings of SPIE). doi: 10.1117/12.2216650

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

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