Repeatability of estimates of left-ventricular volume from blood-pool counts: concise communication.
J Nucl Med
; 24(9): 775-81, 1983 Sep.
Article
en En
| MEDLINE
| ID: mdl-6886811
ABSTRACT
Radionuclide ventriculography permits nongeometric calculation of ventricular volume. Accurate and reproducible determination of left-ventricular (LV) blood-pool counts is necessary to perform this calculation. Furthermore, to make serial volume determinations one must know the half-time of in vivo blood-pool activity. We compared five methods of LV count determination in nine patients. Interpatient and intrapatient variability of the in vivo half-time of Tc-99m-labeled red blood cells (RBCs) was measured. Left-ventricular count determinations, derived from temporally and spatially smoothed images using a second-derivative algorithm to identify the LV region of interest (ROI), are less variable than those based on manual ROI determinations. The mean in vivo half-time of Tc-99m RBCs is 4.1 hr, and there is significant interpatient (0.9 +/- 0.8 hr) and intrapatient (1.0 +/- 0.9 hr) variability. These findings should be considered in the determination of serial, relative ventricular volume by radionuclide ventriculography.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Volumen Cardíaco
/
Corazón
/
Cardiopatías
Tipo de estudio:
Prognostic_studies
Límite:
Adult
/
Aged
/
Female
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Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
J Nucl Med
Año:
1983
Tipo del documento:
Article