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Alzheimer's Disease: Overview01:26

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Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
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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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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Imaging Studies I: CT and MRI01:14

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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
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Updated: Jan 8, 2026

Hybrid PET/MRI Imaging of Alzheimer's Disease Based on 18F-AV-1451
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Hybrid PET/MRI Imaging of Alzheimer's Disease Based on 18F-AV-1451

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Consorcio de Imagenología de Alzheimer

Lawrence P Binding1, Mihaela Croitor1, Christopher S Parker1

  • 1UCL Hawkes Institute and Department of Computer Science, University College London, London, UK.

Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 23, 2025
PubMed
Resumen
Este resumen es generado por máquina.

La enfermedad de Alzheimer (EA) a menudo implica patologías mixtas, lo que dificulta el diagnóstico. El nuevo software, Additional Pathology Inference (AddiPath), ahora puede distinguir la deposición de tau de otras patologías, mejorando la precisión diagnóstica.

Palabras clave:
Alzheimer's diseasetau pathologyAddiPath softwarebiomarkersneuroimagingTDP-43diagnosisclinical trialsmixed pathologiesneuroscience

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Área de la Ciencia:

  • Neurociencia
  • Descubrimiento de biomarcadores
  • Imagenología médica

Sus antecedentes:

  • La enfermedad de Alzheimer (EA) frecuentemente presenta patologías mixtas, lo que complica el diagnóstico in vivo debido a la limitada disponibilidad de biomarcadores para patologías no tau.
  • La atrofia del grosor cortical (CT) está influenciada tanto por la deposición de tau como por otras patologías como TDP-43.
  • Los biomarcadores existentes de tau-PET pueden ayudar a diferenciar estas contribuciones.

Objetivo del estudio:

  • Presentar el software Additional Pathology Inference (AddiPath) para identificar cambios en biomarcadores de la enfermedad más allá de la patología primaria de tau.
  • Aplicar AddiPath a datos de tau-PET para detectar cambios en el grosor cortical (CT) no atribuibles a la deposición de tau.

Principales métodos:

  • Análisis de datos emparejados de tau-PET y CT de 444 sujetos de la Iniciativa de Neuroimagen de la Enfermedad de Alzheimer (ADNI).
  • Se utilizó Subtype and Stage Inference (SuStaIn) en tau-PET para identificar subtipos de patología tau.
  • Se aplicó AddiPath para cuantificar las contribuciones de la tau y otras patologías a los valores regionales de CT, estimando los patrones de progresión.

Principales resultados:

  • SuStaIn identificó subtipos distintos de deposición de tau (posterior, límbica, cortical).
  • AddiPath reveló un patrón independiente de progresión de la patología que se origina en la corteza entorrinal y se extiende por el cerebro.
  • 84 participantes mostraron evidencia de patología adicional
  • las etapas aumentadas de AddiPath se correlacionaron con una peor función cognitiva (memoria, lenguaje, función ejecutiva) y fueron independientes de la carga de tau.

Conclusiones:

  • AddiPath desentraña eficazmente las contribuciones de patologías adicionales de la patología primaria de tau en la enfermedad de Alzheimer.
  • Se descubrieron cambios en CT no explicados por la tau, lo que podría indicar deposición de TDP-43, particularmente en el lóbulo límbico.
  • Este método es prometedor para mejorar la selección de pacientes en ensayos clínicos y la estratificación de pacientes en la investigación de la EA.