Positron

in a three dimensional format on a computer screen. PET stands for Positron Emission Tomography and it is much more complicated than the CAT scan. PET machines bombard the subject with doses of positrons -- the anti-matter equivalents of the electrons. As the positrons enter the body, they encounter electrons which are escaping from radioactive elements which have been injected into the bloodstream. When the positrons and the electrons collide, they give off energy which is recorded by

Introductions Beta Radiation is a high-energy electron that carries a negative charge. That is send out by some radioactive nuclei. And it is ionizing than Alpha radiation and more ionizing than gamma rays. This makes travel through many centimeters or even meters. And millimeters through the skin and tissue. Effects on living things The Washington State Department of Health takes note of that beta particle exposure can have deferred wellbeing impacts on the body. Any quantity of radiation exposure

Matter is anything made up of atoms and molecules and the study of these “things” called atoms dates back to the time of Ancient Greece to the present. The information about atoms known today is certainly much greater than what was known centuries ago. First, there were only hypotheses on this idea that everything in the world is made up of tiny, unseeable particles. As technology advanced, these hypotheses were tested, critiqued, modified, and built upon. A mass of knowledge is known regarding atoms

Física da Radiação, 1º semestre, IST, 2010/2011 1 Radiopharmacology Radiopharmacology Diogo Ferreira, diogo.cunha.ferreira123@gmail.com MSc student in Biomedical Engineering, Instituto Superior Técnico, student no58548 Abstract Nuclear Medicine is the branch of medicine concerned with the use of radio-nuclides in the study and the diagnosis of diseases, eg. the assessment of organ function, detection and treatment of some diseases or monitoring of treatment’s effects. It provides physiological

In healthy multicellular organisms, the majority of cells are exposed to a constant supply of nutrients. When this supply exceeds the nutrient levels required for cell division, specialized regulatory systems prevent uncontrolled cellular proliferation. In other words, cells only take up nutrients from their environment upon stimulation by growth factors. By acquiring mutations that alter the receptor-initiated signaling pathways, cancer cells are able to overcome the growth factor dependence exhibited

The first modality is radiography which utilizes x-rays to generate images. Mammography and Computed Tomography (CT) also use x-rays. Depending on which test is used, hard or soft tissue can be visualized. Classical radiography is used to create images of hard tissue like bones, and can be used to diagnose broken bones. Radiography can provide projections of the human body that showcase the depth and position of the anatomy. Screen-film radiography and digital radiography have spatial resolutions

Broca’s aphasia is a language disorder that affects the production of speech, best categorised as a non-fluent aphasia. It is also known as expressive aphasia, as someone who is affected by it understands what he or she wants to say, but are unable to express it. A sufferer would typically speak in single words, or a series of short utterances, with poor grammar. Their comprehension and perception of language used by others is not affected by this condition. Broca’s aphasia is named after the region

Atomic Theory and the Study of Matter Matter is anything made up of atoms and molecules and the study of these “things” called atoms dates back to the time of Ancient Greece to the present. The information about atoms known today is certainly much greater than what was known centuries ago. First, there was only hypotheses on this idea that everything in the world is made up of tiny, unseeable particles. As technology advanced, these hypotheses were tested, critiqued, modified, and built upon. A

what will the radius of the resultant circular path be? (b) Will the electron be moving clockwise or counter-clockwise when viewed from above? (c) If a positron (same mass as an electron but with a charge of +qe ) is moving in the horizontal plane at speed of 550 kms−1, what will the radius of the resultant circular path be? (d) Will the positron be moving clockwise or counter-clockwise when viewed from above? (e) How fast would an  particle () need to be travelling to have a path of the same

The human brain is one of the most complex structures in the human body. This organ regulates virtually all human activity and controls "higher" mental activity such as thought, reason, and abstraction. Because the brain is so complex, it is essential that neuroscientists be able to study brain functions in the living brain. New technologies in brain imaging, or neuroimaging, have made this possible. These brain imaging technologies have helped neuroscientists to 1) understand the relationship between