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Titolo:
Simplified reference region model for the kinetic analysis of [Tc-99m]TRODAT-1 binding to dopamine transporters in nonhuman primates using single-photon emission tomography
Autore:
Acton, PD; Kushner, SA; Kung, MP; Mozley, PD; Plossl, K; Kung, HF;
Indirizzi:
Univ Penn, Dept Radiol, Philadelphia, PA 19104 USA Univ Penn PhiladelphiaPA USA 19104 pt Radiol, Philadelphia, PA 19104 USA Univ Penn, Dept Psychiat, Philadelphia, PA 19104 USA Univ Penn Philadelphia PA USA 19104 Psychiat, Philadelphia, PA 19104 USA Univ Penn, Dept Pharmacol, Philadelphia, PA 19104 USA Univ Penn Philadelphia PA USA 19104 Pharmacol, Philadelphia, PA 19104 USA
Titolo Testata:
EUROPEAN JOURNAL OF NUCLEAR MEDICINE
fascicolo: 5, volume: 26, anno: 1999,
pagine: 518 - 526
SICI:
0340-6997(199905)26:5<518:SRRMFT>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
D-2 RECEPTOR IMAGES; PARKINSONS-DISEASE; IODINE-123-IBF SPECT; C-11 RACLOPRIDE; PET; BRAIN; QUANTIFICATION; REGISTRATION; DEMENTIA;
Keywords:
dopamine transporters; kinetic modeling; single-photon emission tomography; striatum; technetium;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Acton, PD Univ Penn, Dept Radiol, 3700 Market St,Room 305, Philadelphia, PA 19104 USA Univ Penn 3700 Market St,Room 305 Philadelphia PA USA 19104 USA
Citazione:
P.D. Acton et al., "Simplified reference region model for the kinetic analysis of [Tc-99m]TRODAT-1 binding to dopamine transporters in nonhuman primates using single-photon emission tomography", EUR J NUCL, 26(5), 1999, pp. 518-526

Abstract

Accurate quantification of neuroreceptors requires full kinetic modeling of the dynamic single-photon emission tomography (SPET) or positron emissiontomography (PET) images, with highly invasive arterial blood sampling. This study investigated the application of a reference region kinetic model tothe dynamics of [Tc-99m]TRODAT-1 in nonhuman primates, obviating the need for blood sampling. A series of dynamic SPET scans were performed on two baboons following the injection of approximately 700 MBq of [Tc-99m]TRODAT-1. Rapid arterial blood samples were taken automatically during scanning. Reconstructed SPET images were coregistered with magnetic resonance imaging (MRI) scans of the baboons, and regions of interest (ROIs) placed on the striatum, cerebellum and cerebral hemispheres. The ROI data were combined with metabolite-corrected blood data, and fitted to a three-compartment kinetic model using nonlinear least squares techniques. The same data were also used in a simplified reference region model, in which the input function was derived from the nondisplaceable tissue compartment. In addition, semiquantitative blinded analysis was performed by three raters to determine the point of transient equilibrium in the specific binding curves. All methods generated values for the ratio of the kinetic rate constants k(3)/k(4), which gives an estimate of the binding potential, BP. These were compared with thefull kinetic model. The mean values of k(3)/k(4), for the three different analysis techniques for each baboon were: 1.17+/-0.21 and 1.12+/-0.13 (fullkinetic model), 0.93+/-0.13 and 0.90+/-0.07 (reference region model), and 0.97+/-0.18 and 0.92+/-0.08 (equilibrium method). The reference region method gave significantly lower results than the full kinetic model (P = 0.01),but it also produced a much smaller spread and better quality fits to the kinetic data. The reference region model results for k(3)/k(4) correlated very strongly with the full kinetic analysis (r(2) = 0.992, P<0.001), and with the equilibrium model (r(2) = 0.88, P = 0.002), The subjectivity inherent in the equilibrium method produces inferior results compared with both kinetic analyses. It is suggested that the self-consistency of the reference region model, which requires no arterial blood sampling, provides a more precise and reliable estimate of the binding of [Tc-99m]TRODAT-1 to dopamine transporters than full kinetic modeling. The reference region method is also better suited to a routine clinical environment, and would be able to distinguish smaller differences in dopaminergic function between patient groups.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/01/20 alle ore 01:39:18