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European Journal of Nuclear Medicine and Molecular Imaging

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01-11-2003 | Original Article

Regional differences between ^99mTc-ECD and ^99mTc-HMPAO SPET in perfusion changes with age and gender in healthy adults

Authors: Kentaro Inoue, Manabu Nakagawa, Ryoi Goto, Shigeo Kinomura, Tachio Sato, Kazunori Sato, Hiroshi Fukuda

Published in: European Journal of Nuclear Medicine and Molecular Imaging | Issue 11/2003

Abstract

A number of studies using single-photon emission tomography (SPET) have shown perfusion changes with age in several cortical and subcortical areas, which might distort the results of perfusion imaging studies of neuropsychiatric disorders. Technetium-99m labelled ethyl cysteinate dimer (ECD) and hexamethylpropylene amine oxime (HMPAO) are both used as markers of cerebral perfusion, but have different pharmacokinetics and retention patterns. The aim of this study was to determine whether age and gender effects on perfusion SPET differ depending on whether ^99mTc-HMPAO or ^99mTc-ECD is used. Forty-five subjects (20 male and 25 female, mean age 52.8±6.6 years) were assigned to ^99mTc-HMPAO SPET (HMPAO group), and 39 subjects (24 male and 15 female, mean age 52.6±6.7 years) to ^99mTc-ECD SPET (ECD group). SPET images were obtained about 10 min after intravenous injection of approximately 800 MBq ^99mTc-HMPAO or ^99mTc-ECD using the same SPET scanner. Three-dimensional volumetric magnetic resonance imaging was performed to as7sess morphological changes in the grey matter. All image processing and statistical analyses were performed using SPM99 software. An area in the right anterior frontal lobe showed an increase in perfusion with age only in the HMPAO group, whereas areas in the bilateral retrosplenial cortex showed decreases in perfusion with age only in the ECD group; neither group showed corresponding changes in the grey matter. The present study shows that different effects of age on perfusion are observed depending on whether ^99mTc-HMPAO and ^99mTc-ECD is used. This suggests that the results of perfusion SPET are differently confounded depending on the tracer used, and that perfusion SPET with these tracers has limitations when used in research on subtle perfusion changes.

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Title: Regional differences between 99mTc-ECD and 99mTc-HMPAO SPET in perfusion changes with age and gender in healthy adults
Authors: Kentaro Inoue
Manabu Nakagawa
Ryoi Goto
Shigeo Kinomura
Tachio Sato
Kazunori Sato
Hiroshi Fukuda
Publication date: 01-11-2003
Publisher: Springer-Verlag
Published in: European Journal of Nuclear Medicine and Molecular Imaging / Issue 11/2003
Print ISSN: 1619-7070
Electronic ISSN: 1619-7089
DOI: https://doi.org/10.1007/s00259-003-1234-x

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Regional differences between ^99mTc-ECD and ^99mTc-HMPAO SPET in perfusion changes with age and gender in healthy adults

Abstract

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