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Related Concept Videos

Inertia Tensor01:24

Inertia Tensor

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The concept of the inertia tensor is employed to depict the mass distribution and rotational inertia of a solid or rigid object. This tensor is expressed through a three-by-three matrix. Each component within this matrix corresponds to varying moments of inertia about specific axes.
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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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Diffusion01:21

Diffusion

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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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Wave Parameters01:10

Wave Parameters

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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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Facilitated Diffusion01:16

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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Related Experiment Video

Updated: Feb 11, 2026

Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging
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Diffusion tensor imaging parameters in testes with nonobstructive azoospermia.

Athina C Tsili1, Alexandra Ntorkou1, Anna Goussia2

  • 1Department of Clinical Radiology, Medical School, University of Ioannina, University Campus, Ioannina, Greece.

Journal of Magnetic Resonance Imaging : JMRI
|April 17, 2018
PubMed
Summary
This summary is machine-generated.

Diffusion Tensor Imaging (DTI) parameters like apparent diffusion coefficient (ADC) and fractional anisotropy (FA) can help identify nonobstructive azoospermia (NOA) in men. However, these imaging markers do not predict successful sperm retrieval outcomes.

Keywords:
diffusion tensor imagingmagnetic resonance imagingnonobstructive azoospermiaspermatogenesis

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Area of Science:

  • Radiology
  • Urology
  • Reproductive Medicine

Background:

  • Nonobstructive azoospermia (NOA) affects a significant population of infertile men.
  • Identifying men with NOA who may benefit from sperm retrieval is clinically important.
  • Noninvasive imaging parameters are needed to assess testicular function in NOA.

Purpose of the Study:

  • To evaluate differences in apparent diffusion coefficient (ADC) and fractional anisotropy (FA) in NOA testes.
  • To explore the association between DTI parameters and the presence of spermatozoa after testicular sperm extraction (TESE).

Main Methods:

  • Retrospective study of 20 men with NOA and 21 age-matched controls.
  • 1.5T MRI including Diffusion Tensor Imaging (DTI) sequences.
  • Analysis of testicular parenchyma ADC and FA values, correlated with Johnsen Score (JS) and TESE outcomes.

Main Results:

  • ADC values were significantly different between NOA groups with varying spermatogenesis levels and controls.
  • FA values were elevated in NOA testes compared to controls, irrespective of spermatogenesis.
  • Neither ADC nor FA showed a significant association with sperm retrieval success after TESE.

Conclusions:

  • ADC and FA are increased in NOA testes compared to normal testes.
  • ADC may serve as a diagnostic tool to identify NOA men with some level of spermatogenesis.
  • DTI parameters are not predictive of sperm retrieval success in NOA patients undergoing TESE.