Related Experiment Video
Updated: Jul 20, 2026
10:46
Diffusion Imaging in the Rat Cervical Spinal Cord
Published on: April 7, 2015
Diffusion-weighted MR imaging of viral encephalitis.
Yilmaz Kiroğlu1, Cem Calli, Nilgun Yunten
1Department of Radiology, Pamukkale University School of Medicine, TR-20070 Denizli, Turkey. drkiroglu@yahoo.com
Neuroradiology
|September 1, 2006
Summary
Diffusion-weighted imaging (DWI) aids in diagnosing early viral encephalitis by detecting lesions better than conventional MRI. Apparent diffusion coefficient (ADC) values correlate with disease duration, helping determine illness stage.
Area of Science:
- Neuroradiology
- Infectious Diseases
- Medical Imaging
Background:
- Viral encephalitis diagnosis relies on clinical, laboratory, and radiological findings.
- Conventional MRI sequences (T1-W, T2-W, FLAIR) are standard for brain imaging.
- Diffusion-weighted imaging (DWI) offers advanced insights into tissue microstructure.
Purpose of the Study:
- To evaluate the diagnostic utility of DWI in viral encephalitis.
- To assess the relationship between DWI findings and the stage of viral encephalitis.
- To compare DWI with conventional MRI in detecting and characterizing lesions.
Main Methods:
- 18 patients with diagnosed viral encephalitis underwent conventional MRI and DWI.
- Patients were categorized into three groups based on qualitative and quantitative MRI/DWI comparisons.
- Apparent diffusion coefficient (ADC) values of affected and unaffected brain regions were calculated and compared.
- Correlation between symptom onset time and ADC values was analyzed.
Main Results:
- DWI outperformed conventional MRI in detecting early lesions and defining their borders in 11 patients (Group I).
- DWI and conventional MRI showed similar performance in 4 patients (Group II).
- Conventional MRI was superior to DWI in 3 patients (Group III).
- Significantly lower ADC values were observed in affected brain tissue in early stages (Groups I and II).
- ADC values showed an excellent correlation with disease duration (r=0.874).
Conclusions:
- DWI is superior to conventional MRI sequences for detecting early viral encephalitis lesions and their borders.
- Combined use of DWI with other MRI sequences can help determine the disease stage.
- ADC values serve as a valuable biomarker for assessing viral encephalitis progression.
Related Concept Videos
01:26Encephalitis ll: Pathophysiology
Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
01:18Viral Meningitis
Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...
01:19Encephalitis l: Introduction
Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...
01:25Arboviral Encephalitis
Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
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...
01:27Imaging Studies IV: Magnetic Resonance Imaging
Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...