THE left-to-right shunts found in small atrial or ventricular septal defects or in patent ductus arteriosus are easily demonstrated during cardiac catheterization by both rightand left-sided approaches.' Efforts to evaluate shunting due to these defects without cardiac catheterization have depended on measurements of the cardiac output curves obtained by various external counting technics.Y Bec...

The ever-growing need for radiopharmaceuticals, i.e., compounds containing pharmaceutical drugs and radioisotopes used medical diagnostic imaging (SPECT/PET scan) treating neoplasms, is significantly leading to an increased demand such substances in hospitals clinics worldwide. Currently, most large-scale productions of required radiopharmaceuticals are carried out research reactors, via the fi...

The commercial availability of combined magnetic resonance imaging (MRI)/positron emission tomography (PET) scanners for clinical use has increased demand for easily prepared agents which offer signal or contrast in both modalities. Herein we describe a new class of silica coated iron-oxide nanorods (NRs) coated with polyethylene glycol (PEG) and/or a tetraazamacrocyclic chelator (DO3A). Studie...

RTIFICIAL A radioactive isotopes have been wideIy utiIized in cIinica1 investigations for nearIy two decades. Yet of the more than ninety artificiaIIy produced radioisotopes presentIy available, onIy tweIve have been found usefu1 in the treatment of human iIIness. Of these only four (I-I 3 I, P-32, Au198 and Co-60) are now being cIinicaIIy utiIized in the treatment of diseases of the chest, pri...

Participation of the intervascular transport system within the rice stem during cadmium (Cd) partitioning was investigated by characterizing (109)Cd behaviour in the shoot. In addition, (45)Ca, (32)P, and (35)S partitioning patterns were analysed for comparison with that of (109)Cd. Each tracer was applied to the seedling roots for 15 min, and the shoots were harvested either at 15 min (i.e. im...

In this paper, the feasibility of using an X-ray tube instead radioisotope sources for measuring volume fractions gas, oil, and water in two typical flow regimes three-phase flows, namely, annular stratified, is evaluated. This study’s proposed detection system composed tube, a 1 inch × NaI detector, one Pyrex-glass pipe to model different regimes, stratified. Group method data handling (GMDH),...