WordNet
- (statistics) a coefficient assigned to elements of a frequency distribution in order to represent their relative importance (同)weighting
- sports equipment used in calisthenic exercises and weightlifting; it is not attached to anything and is raised and lowered by use of the hands and arms (同)free weight, exercising weight
- an artifact that is heavy
- the vertical force exerted by a mass as a result of gravity
- the relative importance granted to something; "his opinion carries great weight"; "the progression implied an increasing weightiness of the items listed" (同)weightiness
- an oppressive feeling of heavy force; "bowed down by the weight of responsibility"
- render visible, as by means of MRI
- the general impression that something (a person or organization or product) presents to the public; "although her popular image was contrived it served to inspire music and pageantry"; "the company tried to project an altruistic image"
- an iconic mental representation; "her imagination forced images upon her too awful to contemplate" (同)mental image
- (mathematics) the set of values of the dependent variable for which a function is defined; "the image of f(x) = x^2 is the set of all non-negative real numbers if the domain of the function is the set of all real numbers" (同)range, range of a function
- (physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration
- the spread of social institutions (and myths and skills) from one society to another
- adjusted to reflect value or proportion; "votes weighted according to the size of constituencies"; "a law weighted in favor of landlords"; "a weighted average"
- (medicine) obtaining pictures of the interior of the body (同)tomography
PrepTutorEJDIC
- 〈u〉『重さ』,重量,目方;体重;《a weight》(…の)重さ《+of+名》 / 〈u〉重さ(重力が物体に及ぼす力) / 〈u〉衡法(重量を示す体係) / 〈c〉重量単位 / 〈c〉(はかりの)おもり,分銅;(一般に)重いもの,おもし / 〈u〉重要性,価値 / 〈u〉《しばしば a weight》精神的な重荷,負担 / (…で)…‘に'重荷を負わせる;…‘を'圧迫する;苦しめる《+名+with+名》 / …‘を'重くする
- (鏡に映った)『像』,(レンズによる)映像 / (心に浮かぶ)『像』,心像,イメージ / (絵・彫刻などによる人・動物などの)『像』,肖像;偶像《+『of』+『名』》 / (…に)『そっくりの人』(『物』)《+『of』+『名』》 / (…の)典型;(…の)化身《+『of』+『名』》 / (直喩(ちょくゆ)・隠喩などの)比喩 / …‘の'像を描く;…‘を'思い描く
- 放散,発散,拡散[作用] / 普及,流布 / (文体などの)散漫,冗漫
- 《補語にのみ用いて》(…に)有利な《+toward+名》
UpToDate Contents
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- 1. 急性虚血脳卒中の神経画像 neuroimaging of acute ischemic stroke
- 2. 乳房のMRIおよび新しい技術 mri of the breast and emerging technologies
- 3. ラクナ梗塞 lacunar infarcts
- 4. 急性痙攣発作に関連するMRIの変化 magnetic resonance imaging changes related to acute seizure activity
- 5. 一過性脳虚血発作の定義 definition of transient ischemic attack
English Journal
- Removal of partial volume averaging with free water in MR diffusion tensor imaging using inversion recovery for b0 image.
- Jung KJ.
- Magnetic resonance imaging.Magn Reson Imaging.2014 Jul;32(6):619-24. doi: 10.1016/j.mri.2014.02.020. Epub 2014 Mar 13.
- PURPOSE: To remove the partial volume averaging effect of free water in MR diffusion imaging of neural tissues by use of the fluid attenuated inversion recovery (FLAIR) without the penalty of an extended scan time.MATERIALS AND METHODS: The magnetic resonance images were obtained from a normal volun
- PMID 24666572
- Track Orientation Density Imaging (TODI) and Track Orientation Distribution (TOD) based tractography.
- Dhollander T1, Emsell L2, Van Hecke W3, Maes F4, Sunaert S2, Suetens P5.
- NeuroImage.Neuroimage.2014 Jul;94:312-36. doi: 10.1016/j.neuroimage.2013.12.047. Epub 2013 Dec 31.
- Ever since the introduction of the concept of fiber tractography, methods to generate better and more plausible tractograms have become available. Many modern methods can handle complex fiber architecture and take on a probabilistic approach to account for different sources of uncertainty. The resul
- PMID 24389015
- Geometric Distortion in Diffusion-weighted MR Imaging of the Prostate-Contributing Factors and Strategies for Improvement.
- Donato F Jr1, Costa DN2, Yuan Q1, Rofsky NM1, Lenkinski RE1, Pedrosa I1.
- Academic radiology.Acad Radiol.2014 Jun;21(6):817-23. doi: 10.1016/j.acra.2014.02.001. Epub 2014 Apr 4.
- RATIONALE AND OBJECTIVES: Image distortion on diffusion-weighted imaging (DWI) of the prostate in 3T endorectal magnetic resonance imaging (MRI) examinations is common. The aim of this study was to determine the degree of distortion on DWI using a state-of-the-art clinical protocol and to explore th
- PMID 24709379
Japanese Journal
- DTI-based tractographyによる白質マッピングの脳神経外科手術への応用(手術合併症を防ぐために,II 手術訓練としての外科解剖実習-第23回微小脳神経外科解剖セミナーより-,微小脳神経外科解剖)
- 鎌田 恭輔
- 脳神経外科ジャーナル 20(Supplement_2), 111-118, 2011-10-20
- 拡散テンソルMRIによるtractographyは,従来invisibleな白質内構造を画像化し,eloquent fiberの同定に応用できる.Tractographyによる白質マッピングの現状とその有用性を報告する.各fiberの至適作製条件を設定後,皮質脊髄路(CST)と弓状束(AF)を作製した.白質電気刺激では距離と刺激強度に非線形相関があった.白質刺激MEP閾値は2mA程度であり,皮質刺 …
- NAID 110008790786
- MRI拡散強調画像で発見された乳癌術後局所再発の3例
- 中口 和則,中西 克之,和田 亜美,藤田 正一郎,渡辺 康則,塚原 康生
- 日本外科系連合学会誌 36(2), 147-150, 2011-04-30
- NAID 10029365726
Related Links
- 15 Feb 2009 ... Description of diffusion-weighted and diffusion tensor MR imaging.
- Diffusion-weighted magnetic resonance (MR) imaging provides image contrast that is different from that provided by conventional MR techniques. It is particularly sensitive for detection of acute ischemic stroke and differentiation of acute stroke ...
Related Pictures
★リンクテーブル★
| リンク元 | 「拡散強調画像」 |
| 関連記事 | 「imaging」「image」「weighted」「diffusion」「weight」 |
「拡散強調画像」
- 強い傾斜磁場を印加し静止しているプロトンと拡散しているプロトンの位相変化を測定することで生体内の水分子の拡散運動を画像化
- 水分子の自己拡散(ブラウン運動)を撮像
- ブラウン運動大：低信号：
- 水
- ブラウン運動小：高信号：
-
- 粘性が高く水分子の動きが制限される
- 超急性期脳梗塞
- 虚血→ミトコンドリアATP産生能↓→Na-Kポンプ↓→細胞外Na流入＆細胞外水流入→水の動き制限(ブラウン運動小)→高信号
- 内容物は嚢胞内にはケラチンを含んだ嚢胞液。これが水分子の運動を妨げる原因と考えられる。
- 悪性腫瘍の部位同定
- 悪性腫瘍内では水分子の動きが制限されるとか(参考2)
- 例えば、心原性脳塞栓の脳MRIにおいて、T2強調画像(T2WI)と拡散強調画像(DWI)は同じような信号強度を呈するが、水がDWIでは低信号となり、病巣が見えやすくなるのが特徴。
- DWIの方は解像度がT2WIよりも落ちるので区別できる。
参考
- 1. ラクナ梗塞 診断
- 2.
「imaging」
- n.
- 関
- diagnostic imaging、-graphy、image processing、imaging study
「image」
- n.
- 関
- picture
「weighted」
- adj.
- 重みつきの、加重した
「diffusion」
- n.
- 拡散、放散、流布、普及、伝播
「weight」
- n.