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Computed Tomography01:10

Computed Tomography

7.9K
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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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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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

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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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Video Experimental Relacionado

Updated: Jan 8, 2026

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
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Compensación del obturador rodante sCMOS para microtomografía computarizada dinámica

Daniel S Meggo1, Jacob Herrmann1

  • 1Roy J. Carver Department of Biomedical Engineering, University of Iowa, Iowa City, IA, United States of America.

Physics in medicine and biology
|December 15, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Una nueva técnica de compuerta por fila para microtomografía computarizada dinámica (micro-CT) elimina los artefactos de movimiento de los detectores de obturador rodante. Este método mejora la calidad de la imagen y la resolución espaciotemporal en comparación con la compuerta tradicional por cuadro.

Palabras clave:
4DCTartefactos de movimientocompuerta retrospectivaimagenología de sincrotrónreconstrucción de imágenes resuelta en el tiempo

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Área de la Ciencia:

  • Imagenología Médica
  • Física
  • Ingeniería

Sus antecedentes:

  • La microtomografía computarizada dinámica (micro-CT) es crucial para estudiar la dinámica microestructural.
  • La adquisición con obturador rodante en detectores de semiconductor de óxido metálico complementario científicos introduce artefactos de movimiento.
  • La compuerta convencional por cuadro asume la adquisición simultánea de píxeles, lo que genera imprecisiones.

Objetivo del estudio:

  • Desarrollar una técnica de compuerta retrospectiva específica de la fila de píxeles para micro-CT dinámica.
  • Eliminar los artefactos de movimiento causados por la adquisición con obturador rodante.
  • Mejorar la precisión y la resolución de la imagenología micro-CT dinámica.

Principales métodos:

  • Se desarrolló una novedosa técnica de compuerta por fila que tiene en cuenta el tiempo de adquisición de la fila de píxeles.
  • Se comparó el método de compuerta por fila con la compuerta convencional por cuadro.
  • Se realizaron validaciones analíticas, numéricas (fantasma simulado) y experimentales (objeto inflable, pulmón ex vivo).

Principales resultados:

  • La compuerta por fila minimiza los errores de fase de la imagen de proyección, reduciendo el movimiento fuera de fase y los artefactos.
  • Los errores de fase en la compuerta por fila dependen del tiempo de integración del detector y del ancho de la banda de fase.
  • La compuerta por cuadro propaga errores espacialmente variables, aumentando los artefactos con la distancia al centro de rotación.

Conclusiones:

  • La compuerta por fila elimina eficazmente los artefactos del obturador rodante en micro-CT dinámica.
  • La técnica permite la reconstrucción precisa de fenómenos de alta velocidad.
  • La compuerta por fila ofrece un rendimiento superior a la compuerta por cuadro para estudios de dinámica microestructural.