MicrospheresPolymersPolyglycolic AcidParticle SizeDrug CarriersDelayed-Action PreparationsDrug CompoundingLactic AcidChitosanDrug Delivery SystemsChemistry, PharmaceuticalMicroscopy, Electron, ScanningCapsulesHolmiumNanospheresTechnology, PharmaceuticalBiocompatible MaterialsGelatinHexuronic AcidsGlucuronic AcidPolystyrenesPolyvinyl AlcoholYttrium RadioisotopesAlginatesPorositySurface PropertiesRegional Blood FlowDogsScandiumExcipientsCoronary CirculationPolymethacrylic AcidsCerium RadioisotopesAcrylic ResinsEmulsionsTechnetium Tc 99m Aggregated AlbuminRadioisotopesSolubilityGlassAbsorbable ImplantsPolyglactin 910Strontium RadioisotopesNeedles