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論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	The gray scale value of ear tissues undergoing volume-rendering high-resolution cone-beam computed tomography.
掲載誌名	正式名：Auris, nasus, larynx 略　 称：Auris Nasus Larynx ISSNコード：1879-1476(Electronic)0385-8146(Linking)
掲載区分	国外
巻・号・頁	45(5),pp.971-79
著者・共著者	Komori Masahiro, Miuchi Shinya, Hyodo Jun, Kobayashi Taisuke, Hyodo Masamitsu
発行年月	2018/10
概要	OBJECTIVE:When the thresholds for VR reconstruction from multi-slice CT images are changed, problems develop when assessing pathologies in the absence of standardized thresholds. The advantages of CBCT include lower radiation exposure compared with other techniques and better visualization of small ear structures. However, a disadvantage is that the scanner provides unstandardized gray scale values, thus not CTnumbers (Hounsfield units, HU).METHODS:We analyzed 88 sets of volume data obtained from temporal bones. The gray scale values were measured in aerated areas (two sites), along the ossicular chain (four sites) and in a bone area (one site) in the external and middle ears, and in soft tissue areas (five sites) and bone areas (two sites) in the inner ear.RESULTS:The standard male and female gray scale values were 2448-2970 and 2585-3091 for the aerated areas, 3248-4945 and 3359-5223 for the ossicular chains, 3368-4109 and 3371-4147 for soft tissues, and 4790-5776 and 5044-5959 for bone, respectively. Sex significantly affected the values (p<0.05). Significant differences between aerated areas and ossicular chains, and between soft tissues and bone, were evident (all p<0.0001).CONCLUSION:Volume-rendering (VR) images obtained by cone-beam computed tomography (CBCT) can be standardized simply by using fixed thresholds.
DOI	10.1016/j.anl.2018.01.012
PMID	29428492