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1. 肺の高分解能CThigh resolution computed tomography of the lungs [show details]
…combination of findings has been identified in 8 percent of patients with emphysema . The attenuation coefficient of emphysematous lung usually decreases to a value below minus 950 HU . HRCT is useful in …
2. 胸部CTの原理principles of computed tomography of the chest [show details]
…called a CT number: where AM is the linear attenuation coefficient of a material (eg, soft tissue, bone, fat) and AW is the linear attenuation coefficient of water. The CT number is expressed in Hounsfield …
3. 胸膜のプラーク、肥厚、および腫瘍の画像imaging of pleural plaques thickening and tumors [show details]
…facilitated by CT, which can reliably distinguish fat from other tissues, due to fat low attenuation coefficient of -50HU to -100HU ( and and ) . Solitary fibrous tumors of the pleura originate from submesothelial…
4. 関節痛の画像診断技術による評価imaging techniques for evaluation of the painful joint [show details]
…kVp), can be used to differentiate materials with similar CT numbers (related to the linear attenuation coefficient) such as iodine and bone . Multiple techniques have been developed for acquiring dual-energy …
5. 成人外傷患者における脾損傷のマネージメントmanagement of splenic injury in the adult trauma patient [show details]
…and blood is made using the Hounsfield unit scale, which is a transformation of the linear attenuation coefficient of a material relative to water (at standard temperature and pressure). The Hounsfield unit…

Japanese Journal

深層学習による放射型CTの画像補正

鈴木朋浩,工藤博幸
Ｍｅｄｉｃａｌ　Ｉｍａｇｉｎｇ　Ｔｅｃｈｎｏｌｏｇｙ 37(5), 235-243, 2019
… 画像再構成した雑音が多く減弱補正されていないPET/SPECT画像に対して，後処理として畳み込みニューラルネットワーク（CNN）を用いて，雑音除去と減弱補正を同時に行う手法を提案する．放射能分布画像と減弱係数分布画像の原画像からシミュレーションにより作成した投影データを補正なしの単純FBP法で再構成し，それと原画像とのペアを教師データとして，CNNの学習を行った．さらに，その際に単純FBP法画像に加え …
NAID 130007752664

逐次近似CT画像再構成法における入射光子数と線減弱係数の再構成値

篠原広行,橋本雄幸
医学物理 38(4), 143-158, 2019
<p>[Purpose] The iterative CT image reconstruction (IR) method has been successfully incorporated into commercial CT scanners as a means to promote low-dose CT with high image quality. However, …
NAID 130007607406