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Related Concept Videos

Dementia01:30

Dementia

577
Dementia is a collective term for cognitive disorders primarily affecting memory, thinking, and reasoning. It is not a specific disease but a syndrome, with Alzheimer's disease being the most common cause, accounting for approximately 60-80% of cases. Other types include vascular dementia, Lewy body dementia, and frontotemporal dementia. Dementia affects millions worldwide, particularly older adults, though it is not a normal part of aging.
The progression of dementia is generally gradual....
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Correlations02:20

Correlations

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Correlation means that there is a relationship between two or more variables (such as ice cream consumption and crime), but this relationship does not necessarily imply cause and effect. When two variables are correlated, it simply means that as one variable changes, so does the other. We can measure correlation by calculating a statistic known as a correlation coefficient. A correlation coefficient is a number from -1 to +1 that indicates the strength and direction of the relationship between...
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Correlation and Causation01:27

Correlation and Causation

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Statistical tests can calculate whether there is a relationship, or correlation, between independent and dependent variables. An indirect relationship of the variables signifies a correlation, while a direct relationship shows causation. If it is determined that no connection exists between the variables, then the correlation is a coincidence.
Correlation versus Causation
If the dependent variable increases or decreases when the independent variable increases, there is a positive or negative...
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Correlation01:09

Correlation

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In statistics, two variables are said to be correlated if the values of one variable are associated with the other variable. Depending on the relationship between two variables, correlation can be of three types– positive correlation, negative correlation, and zero correlation.
Two variables, for example, a and b, are said to be positively correlated if both variables move in the same direction. In other words, a positive correlation exists between two variables, a and b, if:
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Radiological Investigation I: X-ray and CT01:30

Radiological Investigation I: X-ray and CT

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Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and...
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Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

Radiological Investigation II: MRI and Ventilation Perfusion Scan

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Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
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Related Experiment Video

Updated: Feb 2, 2026

Using Retinal Imaging to Study Dementia
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Using Retinal Imaging to Study Dementia

Published on: November 6, 2017

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Neuroimaging in dementia. Clinical-radiological correlation.

J Álvarez-Linera Prado1, A Jiménez-Huete2

  • 1Departamento de Diagnóstico por Imagen, Hospital Ruber Internacional, Madrid, España.

Radiologia
|November 29, 2018
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Summary
This summary is machine-generated.

Magnetic Resonance Imaging (MRI) is crucial for diagnosing dementia by identifying patterns of brain atrophy and lesions. Additional imaging techniques can supplement MRI in specialized dementia units.

Keywords:
DemenciaDementiaMRIPETPerfusionRM

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Area of Science:

  • Neurology
  • Radiology
  • Geriatrics

Background:

  • Dementia is a syndrome of chronic, multi-domain cognitive impairment leading to functional limitations.
  • Neuroimaging is essential for diagnosing dementia and differentiating between various underlying causes.

Purpose of the Study:

  • To outline the role of MRI in dementia diagnosis.
  • To discuss the utility of complementary imaging modalities.

Main Methods:

  • Review of current neuroimaging techniques for dementia assessment.
  • Discussion of indications for various imaging modalities including MRI, CT, fMRI, SPECT, and PET.

Main Results:

  • MRI is the standard for detecting atrophy in neurodegenerative diseases (e.g., Alzheimer's disease, frontotemporal degeneration, Lewy body dementia).
  • MRI identifies vascular lesions in vascular dementia and reversible conditions like tumors or hydrocephalus.
  • Other methods like CT, fMRI, SPECT, and PET can offer complementary information but require further established indications.

Conclusions:

  • MRI is the primary imaging modality for dementia evaluation.
  • The use of advanced imaging techniques should be guided by multidisciplinary dementia units due to currently undefined indications.