Related Experiment Video
Updated: Jun 21, 2026
07:00
Diffusion Tensor Magnetic Resonance Imaging in Chronic Spinal Cord Compression
Published on: May 7, 2019
[The clinical value of diffusion tensor imaging in ischemic stroke].
Summary
Diffusion tensor imaging (DTI) reveals that fractional anisotropy (FA) values decrease in ischemic stroke lesions over time. Larger infarct volumes correlate with more severe clinical symptoms, aiding prognosis and rehabilitation planning.
Area of Science:
- Neuroimaging
- Neurology
- Radiology
Context:
- Ischemic stroke poses a significant health challenge.
- Understanding the relationship between imaging parameters and clinical outcomes is crucial for patient management.
- Diffusion Tensor Imaging (DTI) offers insights into white matter integrity.
Purpose:
- To investigate the correlation between DTI-derived parameters and clinical symptoms, infarct volume, and white matter tract alterations in ischemic stroke patients.
- To assess the changes in fractional anisotropy (FA) values in acute and early subacute ischemic stroke.
- To explore the utility of DTI in evaluating fiber tract integrity and its relationship with infarct characteristics.
Summary:
- A study involving ten acute ischemic stroke patients demonstrated a significant decrease in FA values in infarct lesions compared to contralateral tissue.
- The percentage decrease in FA values correlated with the duration of the infarct.
- A strong positive correlation was found between infarct volume and NIHSS scores, indicating greater severity with larger lesions.
- DTI visualization revealed disruption and attenuation of fiber tracts within the infarct areas.
Impact:
- DTI parameters, specifically FA values, change predictably with the progression of ischemic stroke in the acute and early subacute stages.
- Infarct volume is a significant predictor of clinical severity.
- DTI provides valuable information on the structural integrity of white matter tracts, aiding in prognosis assessment and guiding rehabilitation strategies.
Related Concept Videos
01:17Assessment of Diffusion and Perfusion
Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...
01:15Ischemic Stroke l: Introduction
Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.
01:15Ischemic Stroke ll: Pathophysiology
An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
01:24Magnetic Resonance Imaging
Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
01:26Transient Ischemic Attack l: Introduction
A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...
01:19Imaging Studies VII: Vascular Imaging
DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...