Various imaging modalities are available to study the heart, including ultrasound, single photon emission computed tomography, positron emission tomography, computed tomography, and magnetic resonance imaging [1–4]. These modalities are fundamentally different and, consequently, different information is deduced from the images they generate. This paper describes briefly the physical principles ...

Positron Emission Tomography ( PET ) is the most sensitive method to image trace amounts of molecules in vivo. Therefore this technique is used to measure in man or in the living animal biochemical and physiological processes in any organ with threedimensional resolution. The last 25 years have seen a rapid and still ongoing development in the production of positron emitters, radiochemical labe...

In the last section, the newer neuropeptides, the endorphins, and the gutand brain-associated peptides are introduced. Dr. Crapo concludes, "There is then, in this astounding labyrinth of chemical messengers, a certain hope for the future-if we can only rise to the adventure and press forward with the exciting research task at hand." Although this is not a textbook of hormones, nor is it intend...

To study alcohol’s effects on the structure and function of the brain in living human beings, researchers can use various imaging techniques. Positron emission tomography (PET) is a functional imaging approach used to study the metabolism and physiology of the brain. PET studies have found that both acute and chronic alcohol ingestion alter blood flow and metabolism in various brain regions, in...

We used positron emission tomography with I ' 'Clflumazenil to study gamma-aminobutyric acid type Albenzodiazepine receptor binding quantitatively in the cerebral hemispheres, basal ganglia, thalamus, cerebellum, and brainstem of 72 subjects, including 14 with multiple system atrophy of the ataxic (olivopontocerebellar atrophy) type, 5 with multiple system atrophy of the extrapyramidaUautonomic...

The principle of image formation in tomography is summarised. The principle ofpositron electron annihilation is introduced. The principle of coincidence techniques is illustrated. Detector development and perspectives for positron emission tomography (PET) instrumentation for medical research is presented. The physical processes in in positron annihilation, photon scattering and tomograph desig...

Positron Emission Tomography (PET) is a method for measuring biochemical and physiological processes in vivo in a quantitative way by using radiopharmaceuticals labelled with positron emitting radionuclides such as C, N, O and F and by measuring the annihilation radiation using a coincidence technique. This includes also the measurement of the pharmacokinetics of labelled drugs and the measurem...

Positron emission tomography (PET) is a minimally invasive imaging procedure with a wide range of clinical and research applications. PET allows for the three-dimensional mapping of administered positron-emitting radiopharmaceuticals such as (18)F-fluorodeoxyglucose (for imaging glucose metabolism). PET enables the study of biologic function in both health and disease, in contrast to magnetic r...

Positron Emission Tomography (PET) is a method for determining biochemical and physiological processes in vivo in a quantitative way by using radiopharmaceuticals labeled with positron emitting radionuclides as C, N, O and F and by measuring the annihilation radiation using a coincidence technique. This includes also the measurement of the pharmacokinetics of labeled drugs and the measurement o...

Atherosclerosis is dependent on a number of cellular processes from initial endothelial injury to sequestration of lipid in the subendothelial space and activation of immune cells. Risk factors for predicting the development of atherosclerosis are well established, as are the various imaging techniques available to assess the burden of atherosclerosis in patients with symptomatic disease. Howev...