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相关概念视频

Computed Tomography01:10

Computed Tomography

4.6K
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...
28
Positron Emission Tomography01:29

Positron Emission Tomography

4.3K
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...
4.3K
Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

280
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...
280
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

42
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...
42
Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET
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相关实验视频

Updated: Jul 19, 2025

Management of Respiratory Motion Artefacts in 18F-fluorodeoxyglucose Positron Emission Tomography using an Amplitude-Based Optimal Respiratory Gating Algorithm
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Management of Respiratory Motion Artefacts in 18F-fluorodeoxyglucose Positron Emission Tomography using an Amplitude-Based Optimal Respiratory Gating Algorithm

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动态可控制的残留生成对抗网络用于低剂量计算机断层扫描成像.

Zhenyu Xia1, Jin Liu1,2, Yanqin Kang1,2

  • 1School of Computer and Information, Anhui Polytechnic University, Wuhu, China.

Quantitative imaging in medicine and surgery
|August 15, 2023
PubMed
概括

这项研究引入了一种新的生成对抗性学习框架,以增强低剂量计算机断层扫描 (LDCT) 图像. 该方法有效地减少噪音和文物,改善医学诊断的图像质量.

关键词:
低剂量计算机断层扫描 (LDCT)动态控制的 动态控制的生成式对抗网络 (GAN) 是一种产生式对抗网络.噪音人工制造物 噪音人工制造物

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Management of Respiratory Motion Artefacts in 18F-fluorodeoxyglucose Positron Emission Tomography using an Amplitude-Based Optimal Respiratory Gating Algorithm

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Retrospective Cardiac Gating with A Prototype Small-Animal X-ray Computed Tomograph
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科学领域:

  • 医疗成像医学成像
  • 人工智能的人工智能
  • 图像处理 图像处理

背景情况:

  • 低剂量计算机断层扫描 (LDCT) 对于减少医学成像中的辐射暴露至关重要.
  • LDCT图像的信号噪声比率降低,导致条纹文物和噪声.
  • 在LDCT中的图像质量退化在不同的解剖区域之间有很大的差异.

研究的目的:

  • 制定一个统一的框架,用于增强退化LDCT图像.
  • 提高LDCT扫描的质量,同时减轻噪音和文物.
  • 在低剂量CT成像中实现卓越的图像重建.

主要方法:

  • 开发了一个具有动态可控制残余的生成对抗式学习框架.
  • 发电机网络包括一个基本的剩余子网络和一个用于控制剩余强度的有条件子网络.
  • 视觉几何组网络-128 (VGG-128) 被用作区分器,加上混合损失函数 (MSE,SSIM,对抗性,GP).

主要成果:

  • 拟议的框架在挑战和实际数据集上都表现出了竞争性表现.
  • 取得的改进包括3.22 dB的PSNR利和0.03的SSIM利在挑战数据上.
  • 在真实的LDCT数据上展示了1.0 dB的PSNR利和0.01的SSIM利.

结论:

  • 实验结果证实了该方法在降噪方面的有效性.
  • 该框架在最不发达国家图像中的结构性保留和视觉印象增强方面表现出色.
  • 这种方法在低剂量CT图像质量改善方面取得了重大进展.