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相关概念视频

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...
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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 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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相关实验视频

Updated: Jul 13, 2025

Three-dimensional Optical-resolution Photoacoustic Microscopy
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使用代精细波场重建的定量光声学断层扫描反转:一个模拟研究研究.

Seyed Mohsen Ranjbaran, Hossein S Aghamiry, Ali Gholami

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    此摘要是机器生成的。

    定量光声学断层扫描 (qPAT) 通过解决组织变异来改善吸收系数映射. 这种方法通过补偿声音速度的不均性和声学衰减来提高准确性.

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    科学领域:

    • 生物医学成像技术 生物医学成像技术
    • 声学物理 声学物理
    • 光学成像技术的成像

    背景情况:

    • 光声学断层扫描 (PAT) 旨在绘制组织吸收系数的地图.
    • 目前的PAT方法通常假设同质的声学特性和统一的流动性,限制了准确性.
    • 导出吸收系数 (DeAC) 的不准确性源于这些简化假设.

    研究的目的:

    • 开发和评估定量光声断层扫描 (qPAT) 方法,以准确地绘制吸收系数.
    • 克服PAT中同质组织假设的局限性.
    • 为了提高推导吸收系数估计的精度.

    主要方法:

    • 实施了一种代精细的波场重建逆转 (IR-WRI) 方法.
    • 利用乘数的交替方向方法来解决在全波逆转中周期跳转的问题.
    • 开发了一种qPAT方法,可以弥补声音速度 (SOS) 的不均性,流动性衰减和声学衰减.

    主要成果:

    • qPAT方法在估计吸收系数方面表现出更高的准确性.
    • IR-WRI方法有效地处理了SOS不均性和声衰减.
    • 该方法的性能使用新生儿头部数字幻影被验证.

    结论:

    • 开发的qPAT方法显著提高了生物组织中吸收系数映射的准确性.
    • 补偿声学性能变化和流动性衰变对于精确的定量PAT至关重要.
    • 这种方法为复杂的生物结构的定量成像提供了更强大的解决方案.