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Infection01:20

Infection

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When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
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Urinary Tract Infection II: Pathophysiology

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The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
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Cystic Fibrosis: Pathogenesis01:23

Cystic Fibrosis: Pathogenesis

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Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
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Pneumonia II: Pathophysiology

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The pathophysiology of pneumonia involves the following steps:
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Stages of Infection01:26

Stages of Infection

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Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
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基礎科学と病態生理

Gemeng Zhang1, Leland Barnard1, Hugo Botha1

  • 1Department of Neurology, Mayo Clinic, Rochester, MN, USA.

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まとめ
この要約は機械生成です。

本研究では、FDG-PETスキャンを使用した半教師あり学習(SSL)モデルを導入し、認知症の神経病理を予測します。グラフベースのアプローチは脳疾患の種類を正確に特定し、剖検データが限られている場合の診断を改善します。

キーワード:
認知症神経病理FDG-PET半教師あり学習グラフベース学習アルツハイマー病FTLDLBD脳画像診断機械学習

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科学分野:

  • 神経画像診断と計算病理学。
  • 神経学における機械学習の応用。

背景:

  • 正確な認知症診断は、死後の神経病理に依存しており、生体評価を制限します。
  • 陽電子放出断層撮影(PET)は、神経病理の生体予測のための潜在的な方法を提供します。
  • この研究は、FDG-PET画像を使用した神経病理予測のための半教師あり学習(SSL)モデルを提案します。

研究 の 目的:

  • 単一FDG-PET画像からの神経病理予測のための半教師あり学習(SSL)モデルを開発および検証すること。
  • ラベル伝播のための患者類似性ネットワーク(PSN)を活用して神経病理学的状態を予測すること。
  • さまざまな認知症関連病理を区別するモデルの精度を評価すること。

主な方法:

  • 1,495のFDG-PET画像から患者類似性ネットワーク(PSN)を使用したグラフベースのSSLモデルを構築しました。
  • 主成分分析とコサイン類似性を使用して、画像類似性を定義し、PSNを構築しました。
  • ポアソン学習法は、PSN構造内のラベルなしデータに204の注釈付きケースから神経病理ラベルを伝播させました。
  • 性能評価のために、1つ除外交差検証(LOOCV)を採用しました。

主要な成果:

  • モデルは、アルツハイマー病、タウ封入体を有する前頭側頭葉変性症、およびレビー小体病の予測において高い精度を示しました。混同行列分析により、予測パフォーマンスが確認されました。サンキーダイアグラムとラベル分布分析は、臨床診断と予測された神経病理との間に強い相関があることを示しました。

結論:

  • グラフベースのSSLは、神経病理学的ラベルが限られている場合でも、FDG-PET画像を使用して神経病理学的変化を効果的に予測します。
  • SSLモデルは、神経病理学的データが乏しい大規模な神経画像データを統合するのに役立ちます。
  • このアプローチは、認知症の診断と理解を進歩させる可能性を秘めています。