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関連する概念動画

Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
50
Radiological Investigation I: X-ray and CT01:30

Radiological Investigation I: X-ray and CT

414
Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and...
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X-ray Imaging01:24

X-ray Imaging

7.0K
German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
441
Positron Emission Tomography01:29

Positron Emission Tomography

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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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TomoGRAF:非常に稀な視野のCT再構築のためのX線物理駆動の生成放射線フィールドフレームワーク

Di Xu1, Yang Yang2, Hengjie Liu3

  • 1Radiation Oncology, University of California, San Francisco, California, United States of America.

PloS one
|August 22, 2025
PubMed
まとめ

TomoGRAFは,超稀少なX線画像から3Dコンピュータトモグラフィ (CT) のボリュームを再構築し,従来の方法の限界を克服します. この新しいアプローチは,最小限のデータで,重要な医療用途のための高品質の3Dイメージングを可能にします.

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Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
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Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
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科学分野:

  • 医療用イメージング
  • コンピュータ画像
  • 放射線療法

背景:

  • コンピュータトモグラフィー (CT) は高解像度3D可視化が可能ですが,通常は多数の角度サンプルが必要です.
  • 物理的および機械的な制約は,特に稀視CTでは,実用的なデータ取得を制限します.
  • ディープラーニングやNeural Radiance Fields (NeRF) を含む既存の稀視CT再構築方法は,特に超稀視シナリオでは,限定的成功を収めている.

研究 の 目的:

  • 超稀なX線投影から高品質の3DCTボリュームを再構築するための新しい方法であるTomoGRAFを開発する.
  • CTイメージングにおける限られた角のサンプリングの課題に対処するためです.
  • 最小限のX線画像から3Dの体積データを要求する医療用アプリケーションに一般化可能なソリューションを提供する.

主な方法:

  • トモグラフ (TomoGRAF) を開発し,CT幾何学に基づいてX線材料の衰弱をシミュレートするボリュームレンダリングモジュールを含むシステム.
  • シミュレーションと実用的なボリュームの違いを罰するトレーニング戦略を実装し,以前の忠誠度を高めました.
  • 標準的な可視光レンダリングとは異なる,X線物理のための適応ニューラル放射場 (NeRF) 原則.

主要な成果:

  • TomoGRAFは最先端のディープラーニングと NeRF 方法よりも 性能の有意な改善を示した.
  • このシステムはLIDC-IDRIデータセットで訓練され,独自のイメージング特性を持つ独立した内部データセットで検証されました.
  • 超稀なプロジェクションデータでも高品質の3DCTボリューム再構築を達成しました.

結論:

  • TomoGRAFは,1つまたは数個のX線画像から3Dの体積情報を再構築するための最初の一般化可能なソリューションを提供します.
  • この進歩は 画像誘導放射線療法や 介入放射線学のような応用に 極めて重要です
  • 伝統的なCTデータ取得が不可能である重要な3Dの洞察を可能にします.