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相关概念视频

Computed Tomography01:10

Computed Tomography

8.0K
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...
8.0K
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

2.8K
Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

286
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...
286
Positron Emission Tomography01:29

Positron Emission Tomography

7.0K
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...
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相关实验视频

Updated: Jan 18, 2026

Three-dimensional Optical-resolution Photoacoustic Microscopy
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Three-dimensional Optical-resolution Photoacoustic Microscopy

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D-STAR:以扩散为基础的稀疏断层图像角度恢复,用于同位素分辨率的光声学成像.

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    基于扩散的稀疏断层扫描角度恢复 (D-STAR) 通过减少所需的成像角度来增强光声断层扫描 (PAT). 这种新的方法保持了高图像质量,同时提高了分辨率,对比度和时间分辨率,最大限度地减少了激光曝光.

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    科学领域:

    • 医疗成像医学成像
    • 计算成像技术的成像
    • 生物医学工程 生物医学工程

    背景情况:

    • 图像系统中的异位性导致方向降解,降低图像质量并复杂化分析.
    • 多环成像减轻异构性,但增加成像时间和激发剂量.

    研究的目的:

    • 引入基于扩散的稀疏断层扫描角度恢复 (D-STAR) 高分辨率的光声断层扫描 (PAT).
    • 为了减少PAT所需的角度数量,同时保持图像质量.
    • 为了优化分辨率,信号噪声比 (SNR) 和激光曝光之间的平衡.

    主要方法:

    • 在定制的3D PAT数据集上训练了一个扩散模型.
    • 开发了D-STAR以恢复稀疏的断层扫描角度数据.
    • 使用切除的大脑和血管幻影验证了该方法.

    主要成果:

    • D-STAR实现了与全断层成像相提并论的高保真图像.
    • 该方法显著改善了分辨率和对比度.
    • 在结构性恢复和定量数据提取方面表现优于现有的方法.

    结论:

    • D-STAR提供了一种新的解决方案,以减少PAT中的角度采样.
    • 这种方法增强了成像灵活性,改善了时间分辨率,并将激光暴露降到最低.
    • 可实现高质量的结构和分子成像,降低了硬件要求.