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High-Performance Liquid Chromatography: Introduction01:11

High-Performance Liquid Chromatography: Introduction

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High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
In HPLC, two phases play a critical role in the separation process:
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High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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High-Performance Liquid Chromatography: Instrumentation00:57

High-Performance Liquid Chromatography: Instrumentation

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High-performance liquid chromatography, or HPLC, is an analytical technique that separates liquid samples under high pressures. An HPLC instrument consists of glass bottles for storing solvents called mobile phase reservoirs. HPLC-grade solvents are used to maintain high purity, and the dissolved gases are removed using a degasser, such as a vacuum pumping system or sparging with helium. The solvents are then pumped into the analytical column using a screw-driven syringe or reciprocating pumps.
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High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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A Volumetric Method for Quantification of Cerebral Vasospasm in a Murine Model of Subarachnoid Hemorrhage
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Segmentación de buques para la separación de la susceptibilidad cuantitativa

Taechang Kim1, Sooyeon Ji1,2, Kyeongseon Min1

  • 1Laboratory for Imaging Science and Technology, Department of Electrical and Computer Engineering, Seoul National University, Seoul, Republic of Korea.

Magnetic resonance in medicine
|September 2, 2025
PubMed
Resumen

Un nuevo método de segmentación de recipientes mejora el mapeo cuantitativo de la susceptibilidad (QSM) al separar con precisión las señales paramagnéticas y diamagnéticas. Esta técnica mejora la cuantificación de hierro y mielina en aplicaciones de imágenes cerebrales.

Palabras clave:
análisis de imágenesSegmentación del buqueSeparación x

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Área de la Ciencia:

  • Imágenes neurológicas
  • Física médica
  • Ingeniería biomédica

Sus antecedentes:

  • El mapeo cuantitativo de la susceptibilidad (QSM) genera mapas paramagnéticos (χpara) y diamagnéticos (
  • Los artefactos vasculares en QSM interfieren con la cuantificación precisa del hierro y la mielina.
  • Los métodos avanzados de QSM como la separación χ tienen como objetivo mejorar la caracterización de los tejidos.

Objetivo del estudio:

  • Desarrollar un nuevo método de segmentación de recipientes para la separación χ para abordar los artefactos causados por los recipientes.
  • Mejorar la precisión de la cuantificación del hierro y la mielina en las aplicaciones de QSM.

Principales métodos:

  • Un método de tres pasos que involucra la generación de semillas, el crecimiento de la región guiada y el refinamiento de la máscara.
  • Utilizado R2* y el producto de χpara y χdia mapas para la generación de semillas.
  • Comparación del rendimiento con las técnicas de segmentación de buques existentes en términos cualitativos y cuantitativos.

Principales resultados:

  • El método propuesto demostró un rendimiento superior, logrando altas puntuaciones de dados (por ejemplo, 76,7% para χpara en 3T).
  • Se excluyeron efectivamente las estructuras no vasculares, mejorando la precisión en el análisis QSM.
  • Muestra mejoras notables en la evaluación cuantitativa de χ-sepnet-R2* y diferencias significativas en el análisis del ROI.

Conclusiones:

  • El método de segmentación de buques desarrollado genera máscaras de buques de alta calidad para QSM.
  • Esta técnica tiene el potencial de facilitar diversas aplicaciones de QSM al permitir un análisis más fiable.