カミヤ　コウヘイ   Kamiya Kohei   神谷　昂平    所属   東邦大学  医学部 医学科（大森病院）    職種   講師
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Preliminary report on virtual monochromatic spectral imaging with fast kVp switching dual energy head CT: comparable image quality to that of 120-kVp CT without increasing the radiation dose.
掲載誌名	正式名：Japanese journal of radiology ISSNコード：18671071
出版社	SPRINGER
巻・号・頁	31(4),pp.293-8
著者・共著者	Kouhei Kamiya,Akira Kunimatsu,Harushi Mori,Jiro Sato,Masaaki Akahane,Takana Yamakawa,Kuni Ohtomo
発行年月	2013/04
概要	PURPOSE: This study aimed to evaluate whether the image quality of virtual monochromatic spectral imaging with fast kVp switching dual-energy CT (DECT) can be comparable to that of 120-kVp single-energy CT (SECT) without increasing the radiation dose.MATERIALS AND METHODS: We retrospectively identified 15 postoperative patients who had undergone both DECT and 120-kVp SECT within a short period of time for follow-up after brain surgery. Simulated 65 keV monochromatic images were reconstructed from DECT data. Subjective image noise, gray-white matter contrast, and overall image quality were rated using a four-point scale. Quantitative measurement of noise, contrast-to-noise ratio (CNR), and posterior fossa beam-hardening artifact were also performed. The figure of merit (FOM), calculated as CNR(2)/CTDIvol, was used to quantify image quality improvement per exposure risk. RESULTS: The mean CTDIvol was 70.2 ± 0.3 mGy for DECT, which was 11 % lower than SECT (78.9 ± 2.1 mGy). All images were graded above clinically acceptable. Quantitative and qualitative measures for simulated 65-keV images were comparable with SECT images, except for increase in subjective noise. FOM was significan
DOI	10.1007/s11604-013-0185-9
PMID	23408047