Regional dynamics of N-isopropyl-(/sup 123/I)p-iodoamphetamine in human brain
Regional cerebral dynamics of N-isopropyl-(123I)p-iodoamphetamine (IMP) in the human brain were studied using a multi-detector single photon emission computed tomography (SPECT) scanner in 35 subjects both normal and with a variety of neurological conditions. Distribution of IMP in the brain was also compared with regional cerebral blood flow (CBF) measured by positron emission tomography (PET) in 15 of these 35 cases. A significant regional difference in temporal changes of radioactivity was observed among normal brain structures. A rapid increase with early washout of the tracer was shown in the cerebellum and the occipital cortex, while the basal ganglia revealed a relatively slow increase and prolonged retention, indicating the regional difference in extraction and/or retention of IMP among the cerebral tissues. In cases with unilateral hypoperfusion, the percentage of the activity in the lesion to that in the contralateral normal cortex on the early SPECT was correlated well with that on CBF measured by PET (r = 0.870, p less than 0.001). However, the contrast on the SPECT image decreased with time after injection; 84.0 +/- 7.4% on the SPECT at 5-20 min scan, 87.6 +/- 7.6% at 35-50 min scan and 96.2 +/- 6.3% at 5 hr scan. In a case with a brain tumor having high blood flow documented by PET, increased accumulation of IMP was observed in the tumor on the early images obtained within 20 min followed by a rapid washout. These findings suggested altered extraction and/or retention of IMP in normal and diseased tissues, and these factors should be considered for the assessment of distribution and redistribution of IMP.
- Research Organization:
- Kyoto Univ. School of Medicine (Japan)
- OSTI ID:
- 5820464
- Journal Information:
- J. Nucl. Med.; (United States), Vol. 30:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cerebral dynamics of N-isopropyl-(123I)p-iodoamphetamine
Quantification of regional cerebral blood flow with IMP-SPECT. Reproducibility and clinical relevance of flow values
Related Subjects
BRAIN
BLOOD FLOW
NEOPLASMS
DIAGNOSIS
NERVOUS SYSTEM DISEASES
RADIOPHARMACEUTICALS
TISSUE DISTRIBUTION
AMPHETAMINES
COMPARATIVE EVALUATIONS
IODINE 123
MAN
POSITRON COMPUTED TOMOGRAPHY
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
ANALEPTICS
ANIMALS
AUTONOMIC NERVOUS SYSTEM AGENTS
BETA DECAY RADIOISOTOPES
BODY
CENTRAL NERVOUS SYSTEM
CENTRAL NERVOUS SYSTEM AGENTS
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
DISEASES
DISTRIBUTION
DRUGS
ELECTRON CAPTURE RADIOISOTOPES
EMISSION COMPUTED TOMOGRAPHY
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPES
LABELLED COMPOUNDS
MAMMALS
NERVOUS SYSTEM
NUCLEI
ODD-EVEN NUCLEI
ORGANS
PRIMATES
RADIOISOTOPES
SYMPATHOMIMETICS
TOMOGRAPHY
VERTEBRATES
550601* - Medicine- Unsealed Radionuclides in Diagnostics