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相关概念视频

Computed Tomography01:10

Computed Tomography

4.3K
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 for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

3
Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
3
Radiological Investigation I: X-ray and CT01:30

Radiological Investigation I: X-ray and CT

214
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...
214
Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT01:25

Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT

3
Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
3
X-ray Imaging01:24

X-ray Imaging

5.4K
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...
5.4K
Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

198
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...
198

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相关实验视频

Updated: Jun 8, 2025

3D Imaging of Soft-Tissue Samples using an X-ray Specific Staining Method and Nanoscopic Computed Tomography
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3D Imaging of Soft-Tissue Samples using an X-ray Specific Staining Method and Nanoscopic Computed Tomography

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用双能量CT对结石成分进行表征的可概括框架.

Picha Shunhavanich1, Andrea Ferrero2, Cynthia H McCollough2

  • 1Faculty of Medicine, Chulalongkorn University, 1873 Rama IV Rd, Pathum Wan, Bangkok 10330, TH (P.S.); Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 55905 (P.S., A.F., C.H.M., S.S.H.).

Academic radiology
|November 5, 2024
PubMed
概括

一个新的框架通过估计各种患者大小和扫描协议的正确CT数比 (CTRs) 来准确预测使用双能CT (DECT) 的结石组成. 这种方法有助于在临床环境中对非尿酸 (NUA) 石头进行分类.

关键词:
这就是为什么CTCTCTCTCTCT双能量CT是双能量CT.结石是指结石的发生.模拟模拟是为了模拟.

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DUCT: Double Resin Casting followed by Micro-Computed Tomography for 3D Liver Analysis
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Proximal Cadaveric Femur Preparation for Fracture Strength Testing and Quantitative CT-based Finite Element Analysis
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科学领域:

  • 医疗成像医学成像
  • 放射学 放射学是一门学科.
  • 生物物理学的生物物理.

背景情况:

  • 使用双能CT (DECT) 分类非尿酸 (NUA) 结石是具有挑战性的,因为相似的CT数比 (CTRs) 和患者大小和获取协议的变化.
  • 精确的石头表征对于有效的患者管理和治疗规划至关重要.

研究的目的:

  • 开发一个可概括的框架来估计不同类型的结石,DECT协议和患者大小的正确CTR值.
  • 通过使用两个DECT扫描仪,对虚拟插件和人类尿路结石验证框架的准确性.

主要方法:

  • 该框架使用通用的X射线光谱,并估计添加过,以匹配半值层 (HVL) 测量.
  • 它根据化学成分和患者大小预测CTR,并通过/插件和五种类型的人类尿路结石在不同大小的幻影中进行验证.
  • 用双源DECT扫描仪使用常规采集参数在高剂量下进行扫描.

主要成果:

  • 预测的CTR与不同的石头类型的实验测量值在幻影尺寸 (30,40,50厘米) 中非常接近,平均绝对误差在1.8%至2.8%之间.
  • 该框架表现出高准确度,幻影插件预测的CTR误差在6.4%以内.

结论:

  • 开发的框架有效地预测结石CTR用于各种组成和患者大小,使用易于获得的HVL测量.
  • 这一框架的进一步完善有望改善NUA结石亚型的临床分类.