Relaxation Time Measurement
Relaxation Time Measurement - Related Videos
05:30
Measurement of Tumor T2* Relaxation Times after Iron Oxide Nanoparticle Administration
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Cited by 1 •
2023
We present a standardized protocol for the quantification of T2* relaxation times of tumors using external software. Multi-echo gradient echo images are acquired and fed into the software to create tumor T2* maps and measure tumor T2* relaxation times.
01:29
Relaxation of Skeletal Muscles
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2024
The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions. When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
07:51
Mesenteric Artery Contraction and Relaxation Studies Using Automated Wire Myography
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Cited by 37 •
2011
An automated myography method for force measurements in isolated mesenteric arteries is described. It employs a Mulvany-Halpern Auto Dual Wire Myograph 510A to determine responses to phenylephrine and extracellular calcium. The method allows consistent determination of isometric responses to agonists in small vessels of diameters of 60 - 300 μm, independently.
04:56
Real-Time Force Measurement Between Emulsion Droplets During Enzymatic Breakdown
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2025
This protocol employs dual-trap optical tweezers to measure inter-droplet forces in real time during the enzymatic digestion of emulsions. It facilitates the study of emulsion stability and droplet dynamics, with applications in food science and pharmaceuticals.
01:28
Classification of Skeletal Muscle Relaxants
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2023
Skeletal muscle relaxants are a group of drugs that can reduce muscle stiffness and induce temporary paralysis to relieve pain. These agents can act centrally to reduce muscle tone or spasms in painful conditions such as multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), or spinal injuries; they are called antispasmodics or spasmolytics. Peripherally acting skeletal muscle relaxants interfere with the neurotransmission at the neuromuscular end plate to induce paralysis during...
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T1 and T2 describe different signal behaviors after radiofrequency excitation. T1 tracks recovery of nuclear magnetization toward equilibrium, while T2 tracks the loss of coherence among nuclear spins. Measuring both therefore distinguishes recovery-related and coherence-related responses, helping investigators compare how water content, molecular mobility, and local surroundings shape tissues, proteins, membranes, and other biological materials.
Relaxation time measurement results vary with water content, molecular mobility, and the local environment surrounding the nuclei. These properties alter how biological material responds after excitation, so tissues or molecular systems with different composition or organization can produce different time-dependent signals. Comparing those differences helps characterize material properties and interactions rather than treating all biological samples as equivalent.
A single signal value cannot show how nuclear magnetization recovers or how coherence is lost. Recording the signal across time provides the pattern needed to determine relaxation times, while analyzing that pattern makes the measurement quantitative. The resulting values can then be compared across tissues, proteins, membranes, or other samples to identify differences in molecular behavior.
After radiofrequency excitation, the system’s magnetic resonance signal is monitored as it changes over time. The recorded signal is then analyzed to determine the relevant relaxation behavior, such as magnetization recovery for T1 or coherence loss for T2. Applying this workflow to different biological materials produces comparable measurements of their molecular motion, interactions, and material properties.
Tissues, proteins, membranes, and other biological materials can be examined using relaxation time measurements. The method is useful when differences in water content, molecular mobility, or local environment may distinguish one sample from another. Measurements can therefore support both tissue characterization and studies of biomolecular systems whose physical properties change with molecular interactions or organization.
In biology and biomedicine, these measurements support noninvasive imaging, biomolecular studies, disease characterization, and the development of diagnostic and research methods. Relaxation values provide a way to compare biological materials through their signal behavior rather than relying only on direct sampling. This makes the approach relevant to both tissue-focused investigations and studies of molecular systems such as proteins and membranes.