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相关概念视频

Imaging Studies II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

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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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Ultrasonography01:17

Ultrasonography

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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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Ultrasound I: Abdominal Ultrasonography01:20

Ultrasound I: Abdominal Ultrasonography

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Introduction:
Abdominal ultrasonography, commonly known as abdominal ultrasound, is a vital, non-invasive medical imaging technique widely used in healthcare.
Procedure:
This diagnostic tool allows the clinician to visually inspect internal structures within the abdomen, including vital organs such as the liver, gallbladder, pancreas, kidneys, and spleen.
The abdominal ultrasound process begins with applying a special gel to the patient's skin over the abdomen. This gel enhances the...
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Computed Tomography01:10

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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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Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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通过随机优化进行离网超声波成像.

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    反射率的反向无网格估计 (INFER) 通过解决反向问题来改善超声波成像. 这种方法提高了图像分辨率和对比度,同时对声音变化的速度保持稳定,性能优于传统的光束成型.

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    科学领域:

    • 医疗成像医学成像
    • 计算物理 计算物理
    • 信号处理 信号处理

    背景情况:

    • 超声成像中的延迟和总和 (DAS) 束成型产生了工件,需要多次传输以获得清晰度.
    • 反向问题方法提供高图像质量,传输量较少,但通常需要精细的网格,对参数变化敏感.

    研究的目的:

    • 引入反向无网格反射率估计 (INFER),用于超声波反射散射问题的离网,随机算法.
    • 开发一种方法,同时优化网格点位置,反射率和声速,减少网格点要求.

    主要方法:

    • 开发了一种离网的随机算法 (INFER) 用于解决超声波中的反向散射问题.
    • 共同优化了网点位置,反射率和声速,使得网点比传统方法更少.
    • 利用随机优化来同时处理多个传输,而不会增加计算负载.

    主要成果:

    • 在体内数据上实现了2x-3x更高的远场侧面分辨率和6%-68%更高的通用对比比 (gCNR).
    • 经过证明,对音速变化的强度高达±100 m/s.
    • 与现有的光束成形方法相比,在幻影和体内数据上都表现出优越的性能.

    结论:

    • 在超声波图像质量,分辨率和稳定性方面,INFER提供了显著的改进.
    • 离网,随机方法有效地解决了超声波中传统反向问题方法的局限性.
    • INFER提供了一种更有效,更准确的替代传统梁成型技术.