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- 1. 胸部CTの原理principles of computed tomography of the chest [show details]
…that is 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 …
- 2. 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 …
- 3. 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]
…ascites 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…
- 4. 心エコー検査の要点:物理学および計測echocardiography essentials physics and instrumentation [show details]
…reduced due to absorption of the ultrasound energy by conversion to heat, a process called attenuation. Attenuation is frequency and, from the above formation, wavelength dependent. The depth of penetration … results in a reflected signal as wide as the beam width. Beam width artifacts appear as a bright linear structure. The 2D tomographic image includes reflected and backscattered signals from the entire … The rate of temperature increase is related to the absorption coefficient of the tissue for a given frequency,…
- 5. 肺の高分解能CThigh resolution computed tomography of the lungs [show details]
… The attenuation coefficient of emphysematous lung usually decreases to a value below minus 950 HU .… mosaic attenuation, and gas trapping. Accompanying lesions include linear opacities,…
Japanese Journal
- 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
- 電流モードエネルギー分解CTで得られた線減弱係数に基づく実効原子番号評価 (特集 次世代放射線シンポジウム(放射線夏の学校2017))
- 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 = Japanese journal of medical physics 38(4), 143-158, 2018
- NAID 40021876226
Related Links
- 私が、教科書で勉強していたころ、この減弱係数の違いには混乱させられた記憶があります。 それは、線減弱係数やら質量減弱係数、他にただの減弱係数と3つの単語の区別がつきにくい形で載っていることがあったからです。 おかげ ...
- 放射線の勉強中です。減弱係数と線減弱係数は違うものですか? また違いは何ですか? たぶんですが、減弱係数は俗語的な使われ方をする。放射線を物体に照射する場合、間に鉛を置いて穴を空けておけば線状に照射...
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★リンクテーブル★
[★]
- 英
- number、count、numeral
- 関
- ナンバー、数値、数える、カウント、番号をつける、数字、数詞
[★]
- 英
- attenuation coefficient
- 同
- 吸収係数
- 放射線の強度が物質内で吸収される割合を示すものである。
[★]
- 英
- attenuation、attenuate
- 関
- アテニュエーション、弱毒、弱毒化、転写減衰
[★]
- 英
- coefficient、modulus、moduli