In internal radionuclide therapy, a growing interest in voxel-level estimates of tissue-absorbed dose has been driven by the desire to report radiobiologic quantities that account for the biologic consequences of both spatial and temporal nonuniformities in these dose estimates. This report presents an overview of 3-dimensional SPECT methods and requirements for internal dosimetry at both regio...

To assess ventricular function in patients who have undergone cardiac transplantation, 247 radionuclide ventriculograms were performed on 94 patients. During the first three days after transplantation, 19% demonstrated left ventricular dysfunction and 41% showed isolated right ventricular dysfunction. In 95 cases, radionuclide ventriculography was performed within 24 hr of myocardial biopsy. A ...

PURPOSE To compare CT and radionuclide imaging of osmotic blood-brain barrier disruption. To develop a quantitative method for imaging osmotic blood-brain barrier disruption and to see if iopamidol could be safely given intravenously in conjunction with blood-brain barrier disruption. METHODS Forty-five blood-brain barrier disruption procedures were imaged with CT and radionuclide scans. The ...

A new radioanalytical method was developed for rapid determination of (226)Ra in human urine samples. The method is based on organic removal and decolourisation of a urine sample by a polymeric (acrylic ester) solid phase sorbent material followed by extraction and preconcentration of (226)Ra in an organic solvent using a dispersive liquid-liquid microextraction technique. Radiometric measureme...

This study was carried out primarily to understand the hydrogeochemical processes controlling 226Ra anomalies in Ramsar area. Analyses revealed two types of water: (1) non-thermal Ca–HCO3 type and (2) thermal Na–Cl type, mainly meteoric hydrothermal origin, respectively. Non-thermal springs have higher concentrations U due silicate weathering. Thermal are characterized by high 226Ra, As, Fe, Li...

Natural radionuclides activity concentrations of 226Ra, 228Ra, and 40K in soil grass samples, statistical analysis these radionuclides, transfer factors (TFs) from to the were carried out phosphate mining processing sites southern areas Togo using gamma-ray spectrometry-based high-purity germanium (HPGe) detector. The average found within range usually measured worldwide. Statistical was done b...

The radioactive background of the eastern side Lesvos Island in Greece, an island rich natural radioactivity, was studied by means gamma ray spectroscopy. Dose rates and concentrations radionuclides (232Th series, 226Ra 40K) 137Cs were measured in-situ laboratory, respectively. A total twenty soil samples ten beach sand collected processed according to IAEA protocol. For measurement dose rate d...

OBJECTIVE Adenosine, which has been used for a myocardial perfusion scan, shows rapid clearance from blood because of its short half-life of <10 seconds. This simulation study evaluates influences of modes of radionuclide injection on ventricular adenosine concentration when one intravenous injection line is used. METHODS Assuming that radionuclide injection is a unit impulse, time-activity c...