Related Experiment Video
Updated: May 24, 2026
09:59
A Magnetic Resonance Imaging Protocol for Stroke Onset Time Estimation in Permanent Cerebral Ischemia
Published on: September 16, 2017
Magnetic resonance imaging in transient global amnesia: lessons learned from 198 cases
M Scheel1, C Malkowsky, R Klingebiel
1Department of Neuroradiology, Charite-Universitätsmedizin Berlin, Germany. michael.scheel@charite.de
Clinical Neuroradiology
|March 17, 2012
Summary
Diffusion-weighted imaging (DWI) is crucial for diagnosing transient global amnesia (TGA). Thinner DWI slices (≤3 mm) and MRI scans performed on day 2 after symptom onset significantly improve the detection of characteristic hippocampal lesions.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Transient global amnesia (TGA) presents a distinct clinical syndrome, but differential diagnoses are essential.
- Diffusion-weighted imaging (DWI) is a specific diagnostic tool for TGA.
- Standard DWI may miss subtle hippocampal lesions characteristic of TGA.
Purpose of the Study:
- To analyze the diagnostic success of DWI in TGA patients.
- To evaluate the impact of slice thickness on DWI detection rates.
- To determine the optimal time interval between symptom onset and MRI for TGA diagnosis.
Main Methods:
- Retrospective analysis of MRI studies from 198 clinically diagnosed TGA patients.
- DWI studies were categorized by slice thickness (3 mm, 5 mm, 6 mm).
- Detection rates of hippocampal lesions were assessed based on slice thickness and time to MRI.
Main Results:
- Detection rates increased significantly with thinner slices (44.7% for 3 mm vs. 19.6% for 6 mm).
- An approximate 8.4% increase in detection per millimeter reduction in slice thickness was observed.
- Optimal detection rates (up to 80%) were achieved when MRI was performed two days post-symptom onset.
Conclusions:
- MRI protocols for TGA should incorporate DWI sequences with ≤3 mm slice thickness.
- Performing MRI on day 2 after symptom onset maximizes the diagnostic utility of DWI.
- DWI is a sensitive and specific imaging tool for diagnosing TGA.
Related Concept Videos
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...
01:13Amnesia
Amnesia is a condition marked by long-term memory loss, which impairs the ability to recall past events or create new memories.
The severity and duration of memory loss vary depending on the type and underlying cause. Amnesia is classified into two main types: retrograde and anterograde.
Retrograde amnesia is marked by the loss of memories formed before the onset of the condition. Patients may recall distant past events but often forget those occurring shortly before the incident.
Anterograde...
The severity and duration of memory loss vary depending on the type and underlying cause. Amnesia is classified into two main types: retrograde and anterograde.
Retrograde amnesia is marked by the loss of memories formed before the onset of the condition. Patients may recall distant past events but often forget those occurring shortly before the incident.
Anterograde...