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Updated: Jul 11, 2026
10:21
In Vivo Imaging Systems (IVIS) Detection of a Neuro-Invasive Encephalitic Virus
Published on: December 2, 2012
Early dynamic SPECT imaging in acute viral encephalitis.
Hiroshi Kataoka1, Makoto Inoue, Takayuki Shinkai
1Department of Neurology, Nara Medical University, Kashihara, Nara, Japan. hk55@naramed-u.ac.jp
Summary
Dynamic technetium-99m ECD SPECT imaging can help diagnose herpes simplex viral encephalitis (HSVE). Increased tracer uptake in SPECT scans correlated with HSVE lesions, decreasing as symptoms resolved.
Area of Science:
- Neuroradiology
- Nuclear Medicine
- Infectious Diseases
Background:
- Acute herpes simplex viral encephalitis (HSVE) is a severe neurological condition.
- Dynamic single-photon emission computed tomography (SPECT) has shown potential in detecting increased tracer uptake in HSVE.
Purpose of the Study:
- To assess the clinical utility of dynamic Tc-ECD SPECT for diagnosing acute viral encephalitis.
- To investigate the correlation between dynamic SPECT findings and HSVE.
Main Methods:
- Dynamic SPECT and MRI were performed on 9 patients with acute viral encephalitis within two weeks of symptom onset.
- Scans were repeated at symptom resolution to evaluate changes in tracer uptake.
Main Results:
- Cranial MRI revealed lesions in all patients, with temporal lobe and insular involvement being common.
- Dynamic SPECT showed increased Tc-ECD tracer accumulation in three confirmed HSVE cases, corresponding to MRI lesions.
- Six non-HSVE patients exhibited no increased tracer accumulation on dynamic SPECT.
Conclusions:
- Dynamic Tc-ECD SPECT demonstrates potential as an adjunctive diagnostic tool for suspected HSVE.
- This technique may aid in differentiating HSVE from other forms of viral encephalitis.
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