NDLI: Gemstone spectral imaging: determination of CT to ED conversion curves for radiotherapy treatment planning

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Gemstone spectral imaging: determination of CT to ED conversion curves for radiotherapy treatment planning

Content Provider	Scilit
Author	Yagi, Masashi Ueguchi, Takashi Koizumi, Masahiko Ogata, Toshiyuki Yamada, Sachiko Takahashi, Yutaka Sumida, Iori Akino, Yuichi Konishi, Koji Isohashi, Fumiaki Tomiyama, Noriyuki Yoshioka, Yasuo Ogawa, Kazuhiko
Copyright Year	2013
Description	Journal: Journal of applied clinical medical physics The monochromatic images acquired by Gemstone spectral imaging (GSI) mode on the GE CT750 HD theoretically determines the computed tomography (CT) number more accurately than that of conventional scanner. Using the former, the CT number is calculated from (synthesized) monoenergetic X‐ray data. We reasoned that the monochromatic image might be applied to radiotherapy treatment planning (RTP) to calculate dose distribution more accurately. Our goal here was to provide CT to electron density (ED) conversion curves with monochromatic images for RTP. Therefore, we assessed the reproducibility of CT numbers, an important factor on quality assurance, over short and long time periods for different substances at varying energy. CT number difference between measured and theoretical value was investigated. The scanner provided sufficient reproducibility of CT numbers for dose calculation over short and long time periods. The CT numbers of monochromatic images produced by this scanner had reasonable values for dose calculation. The CT to ED conversion curve becomes linear with respect to the relationship between CT numbers and EDs as the energy increases. We conclude that monochromatic imaging from a fast switching system can be applied for the dose calculation, keeping Hounsfield units (HU) stability.
Related Links	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5714581/pdf
Ending Page	186
Page Count	14
Starting Page	173
e-ISSN	15269914
DOI	10.1120/jacmp.v14i5.4335
Journal	Journal of applied clinical medical physics
Issue Number	5
Volume Number	14
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2013-09-06
Access Restriction	Open
Subject Keyword	Journal: Journal of applied clinical medical physics Radiology, Nuclear Medicine and Imaging Dual‐energy Ct Gemstone Spectral Imaging Monochromatic Image Radiotherapy Treatment Planning Ct To Ed Conversion Curve
Content Type	Text
Resource Type	Article

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