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Related Concept Videos

Diffusion01:12

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams. Scientists arbitrarily define this amount of mass as one atomic mass unit (amu) or one Dalton. Electrons are much smaller in mass than protons, weighing only 9.11 × 10-28 grams, or about 1/1800 of an atomic mass unit. As a result, they do not contribute much to an element's overall atomic mass. This means that, when considering atomic mass, it is customary to ignore the mass of any electrons and...
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Mass and weight are often used interchangeably in everyday conversation. For example,  medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the...
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Role of Diffusion MRI Tractography in Endoscopic Endonasal Skull Base Surgery
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Diffusion-weighted MRI in paediatric neuroimaging.

O Carney1, A Falzon1, A D MacKinnon1

  • 1Department of Neuroradiology, Atkinson Morley Regional Neuroscience Centre, St George's University Hospitals NHS Foundation Trust, London, UK.

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Diffusion-weighted imaging (DWI) is valuable in pediatric neuroimaging beyond stroke. This technique aids in diagnosing infections, tumors, and other conditions, improving patient outcomes.

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Area of Science:

  • Neuroimaging
  • Pediatric Radiology
  • Advanced MRI Techniques

Background:

  • Diffusion-weighted imaging (DWI) is a standard neuroimaging tool, but its utility beyond acute infarcts and abscesses is often underestimated, especially in pediatric cases.
  • DWI is crucial for evaluating various pediatric neurological conditions, including intracranial infections, brain tumors, demyelinating diseases, and metabolic disorders.
  • The technique is also valuable for the early detection and characterization of intraocular and skull-base pathologies.

Purpose of the Study:

  • To highlight the under-recognized diagnostic value of DWI in pediatric neuroimaging.
  • To demonstrate the utility of DWI in a variety of pediatric neurological conditions.
  • To emphasize how DWI can improve diagnostic sensitivity and aid in early diagnosis and management.

Main Methods:

  • Review of clinical cases illustrating the application of DWI in pediatric neuroimaging.
  • Integration of DWI findings with other magnetic resonance imaging (MRI) sequences.
  • Analysis of diagnostic performance and impact on patient management.

Main Results:

  • DWI demonstrated significant utility in diagnosing conditions beyond acute infarcts and abscesses in pediatric patients.
  • The technique improved diagnostic sensitivity for various intracranial and intraocular pathologies.
  • Early diagnosis facilitated by DWI, in conjunction with other MRI sequences, led to timely management.

Conclusions:

  • DWI is an underutilized yet powerful tool in pediatric neuroimaging for a broad spectrum of conditions.
  • Incorporating DWI into the diagnostic workup can enhance sensitivity and specificity.
  • Early and accurate diagnosis using DWI can prevent complications and improve patient outcomes.