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相关概念视频

Computed Tomography01:10

Computed Tomography

6.4K
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 II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

61
IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
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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...
56
Ultrasound II: Endoscopic Ultrasound and FibroScan01:25

Ultrasound II: Endoscopic Ultrasound and FibroScan

209
Endoscopic Ultrasound (EUS) and FibroScan are valuable diagnostic tools in gastroenterology and hepatology, each with specific applications and techniques.
Endoscopic Ultrasound (EUS):
209
Ultrasonography01:17

Ultrasonography

6.3K
Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
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相关实验视频

Updated: Sep 18, 2025

Combining Reflectance Confocal Microscopy with Optical Coherence Tomography for Noninvasive Diagnosis of Skin Cancers via Image Acquisition
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自主监督优化射频数据连贯性以改善乳房反射UCT重建

Lei He, Zhaohui Liu, Yuxin Cai

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    |June 23, 2025
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    这项研究引入了新型模块,通过提高射频 (RF) 数据的一致性来增强乳腺癌查的超声波计算机断层扫描 (UCT). 新方法显著提高了图像质量,即使数据稀少.

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    Troubleshooting FoCUS Image Acquisition: Patient Positioning, Transducer Manipulation, and Image Optimization
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    科学领域:

    • 医疗成像医学成像
    • 生物医学工程 生物医学工程
    • 信号处理 信号处理

    背景情况:

    • 反射超声计算断层扫描 (UCT) 对于乳腺癌查至关重要.
    • 在UCT中的图像质量因乳腺组织的声音速度变化而降低.
    • 传统的延迟和总和 (DAS) 算法假定声速均,影响无线电频率 (RF) 数据的一致性.

    研究的目的:

    • 提高射频数据的一致性和反射UCT中的总结.
    • 开发用于增强超声波成像的先进模块.
    • 克服传统UCT算法的局限性.

    主要方法:

    • 引入了三个模块:自主监督的盲 RF 数据段块 (BSegB),基于状态空间模型的强反射预测 (SSM-SRP) 和基于极性的自适应替换精细化 (PARR).
    • 利用接收阵列的空间相关性来增强RF数据的一致性.
    • 使用标准指标 (PSNR,SSIM,RMSE) 和一致性指标 (CF,Var)进行评估.

    主要成果:

    • 在图像质量指标方面取得了显著的改进:平均PSNR为19.64dB,平均SSIM为0.71,平均RMSE为0.10.
    • 在射频数据层面展示了增强的信号连贯性.
    • 在稀疏传输条件下展示了卓越的性能.

    结论:

    • 拟议的框架有效地提高了RF数据的一致性和UCT图像质量.
    • 新型模块的性能优于现有的自适应束形状和深度学习方法.
    • 这种方法为使用UCT进行乳腺癌查提供了有希望的进步.