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Image evaluation of HIV encephalopathy: a multimodal approach using quantitative MR techniques
Paulo T C Prado1, Sara Escorsi-Rosset, Maria C Cervi
1Radiology Section, Internal Medicine Department, Ribeirão Preto School of Medicine, University of São Paulo, São Paulo, Brazil.
Neuroradiology
|May 18, 2011
Summary
Quantitative magnetic resonance techniques like magnetic resonance spectroscopy (MRS) and relaxometry are more sensitive than conventional MRI for detecting early brain changes in children with human immunodeficiency virus (HIV) encephalopathy.
Area of Science:
- Neuroimaging
- Pediatric Neurology
- Infectious Diseases
Background:
- Human immunodeficiency virus (HIV) encephalopathy can cause subtle brain changes.
- Conventional magnetic resonance imaging (MRI) may not detect these early alterations.
Purpose of the Study:
- To compare the sensitivity of conventional MRI versus quantitative MR techniques (MRS and relaxometry) for detecting brain changes in HIV-infected children.
- To assess the utility of quantitative MR techniques in diagnosing early HIV-related brain abnormalities.
Main Methods:
- Prospective study of nine HIV-positive children and nine controls (ages 5-10 years).
- Utilized 1.5-T MRI equipment for magnetic resonance spectroscopy (MRS) and relaxometry.
- Compared quantitative MR findings with conventional MRI results.
Main Results:
- Conventional MRI showed minimal findings in HIV-positive patients and normal results in controls.
- MRS revealed increased choline to creatine (CHO/CRE) ratios in multiple brain regions of HIV-positive children.
- Relaxometry demonstrated significant bilateral abnormalities with prolonged relaxation times in HIV-positive patients.
Conclusions:
- Conventional MRI is insufficient for detecting early brain changes in HIV infection.
- Quantitative techniques, including MRS and relaxometry, are valuable tools for diagnosing early HIV-related encephalopathy.
- Multimodal quantitative MR studies aid in understanding the pathophysiology of HIV-associated neurological complications.
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