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[Simple quantification of brain perfusion SPECT with IMP using a large field gamma camera].
Y Yonekura1, Y Iwasaki, T Fujita
1Department of Brain Pathophysiology, Kyoto University Faculty of Medicine, Japan.
Kaku Igaku. the Japanese Journal of Nuclear Medicine
|November 1, 1990
Summary
This study introduces a straightforward method for quantifying brain perfusion using N-isopropyl-p-[123I]iodoamphetamine (IMP) SPECT. The technique correlates fractional uptake with cardiac output, offering a new index for regional cerebral blood flow.
Area of Science:
- Nuclear Medicine
- Radiopharmacology
- Cerebrovascular Imaging
Background:
- Single-photon emission computed tomography (SPECT) is crucial for assessing brain perfusion.
- Accurate quantification of SPECT data remains a challenge, particularly for cerebral blood flow (CBF).
- N-isopropyl-p-[123I]iodoamphetamine (IMP) is a radiotracer used for brain imaging.
Purpose of the Study:
- To develop a simple method for quantifying brain perfusion SPECT using IMP.
- To establish an index of regional cerebral blood flow (rCBF) based on IMP uptake.
- To evaluate the correlation between IMP fractional uptake and physiological parameters.
Main Methods:
- Intravenous bolus injection of IMP followed by dynamic imaging of the brain and lungs.
- Calculation of fractional uptake (FU) of IMP based on time-activity curves.
- Correlation of FU with body surface area and estimation of cardiac output.
- Quantification of rCBF using FU and estimated cardiac output.
Main Results:
- Fractional uptake (FU) of IMP in the brain showed a strong positive correlation with the inverse of body surface area.
- This suggests that FU is influenced by cardiac output.
- The developed method provided an index of regional cerebral blood flow.
- Compared to PET, the method tended to overestimate rCBF values.
Conclusions:
- A simple method for quantifying brain perfusion SPECT with IMP has been developed.
- The method provides an index of regional cerebral blood flow, influenced by cardiac output.
- The technique is advantageous for institutions with large field gamma cameras but may have limitations in tall subjects or those with cardiopulmonary diseases.