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A quantitative approach to technetium-99m hexamethylpropylene amine oxime
1Department of Nuclear Medicine, Kanazawa University School of Medicine, Japan.
European Journal of Nuclear Medicine
|January 1, 1992
Summary
A new method using technetium-99m hexamethylpropylene amine oxime (99mTc-HM-PAO) allows quantitative brain perfusion evaluation. This brain perfusion index (BPI) method shows age-related decline and is reduced in cerebrovascular disorders.
Area of Science:
- Nuclear Medicine
- Neuroimaging
- Radiopharmacology
Background:
- Quantitative assessment of brain perfusion is crucial for diagnosing and managing neurological disorders.
- Current methods may be invasive or lack precision for routine clinical use.
Purpose of the Study:
- To introduce and validate a non-invasive method for quantitative brain perfusion evaluation using intravenous radionuclide angiography.
- To establish brain perfusion indices (BPI) for objective comparison across subjects.
Main Methods:
- Intravenous injection of technetium-99m hexamethylpropylene amine oxime (99mTc-HM-PAO).
- Graphical analysis to determine the unidirectional influx constant (ku).
- Standardization of ku values to brain perfusion indices (BPI) using region of interest (ROI) ratios.
Main Results:
- Whole-brain BPI showed a significant negative correlation with age in normal subjects (r = -0.632, P = 0.0204).
- Patients with cerebrovascular disorders had significantly lower mean BPI (7.0) compared to controls (10.6).
- BPI demonstrated high correlation with Xenon-133 SPECT cerebral blood flow (r > 0.926).
Conclusions:
- The 99mTc-HM-PAO radionuclide angiography method provides a simple, reliable, and quantitative measure of brain perfusion.
- BPI is a valuable tool for assessing age-related changes and detecting perfusion deficits in cerebrovascular disorders.
- This technique is suitable for routine clinical application as an adjunct to SPECT.