Positron

Positron Emission Tomography Positron Emission Tomography is a scanning technique that allows us to measure in detail the functioning of distinct areas of the human brain while the patient is comfortable, conscious and alert. PET represents a type of functional imaging, unlike X-rays or CT scans, which show only structural details within the brain. The differences between these types of imaging don’t end there. In both X-rays and CT scans, a form of radiation is emitted and travels through the

POSITRON-EMISSION TOMOGRAPHY SCAN Introduction A positron-emission tomography scan (PET scan) is a machine that is used to discover how organs and the brain work. Although it is mainly used to detect cancer, heart problems and brain conditions. How does it work? A PET scan uses radiation produced from a radiotracer as it gathers in different parts of the body. Most PET scans use a radiotracer called fluorodeoxyglucose (FDG). FDG is similar to that of normal glucose. By investigating where the radiotracer

small-molecular-weight targeting agents, including peptides, which are quickly vacated from the body. 152Tb with a half like of 17.5 hours emits positrons perfect for postitron emission tomography imaging. 155Tb emits gamma rays and has a half life of 5.32 days with relatively low energies of 86.55 and 105.3 keV respectively, it is being tested for diagnostic purposes for positron emission tomography and single-photon emission computed tomography cameras. 161Tb produces beta minus particles and is being tested

• The procedures of nuclear medicine imaging are non-invasive. 1 Because of this imaging technology, different medical instruments are not used into the body while detecting or diagnosing a disease. In this way, patients do not feel any pain of the medical instruments as different radioactive materials are used to determine the disease in their body. • Nuclear medicine investigation offers information that is unique including on both function and structure and often inaccessible using other imaging

When the word radiation is said most people automatically think cancer. There are many uses of radiation in medicine. There are several ways to detect forms of cancer in the body. One form of detection is having a positron emission tomography scan also knows as a PET scan. Radiation is also used as a therapy through the use of a treatment using chemotherapy. There is also a form of treatment called Radiation therapy that is used as a medical use. The journey from using radiation to detect if the

Should Nuclear medicine imaging (PET Scans) become the first option for diagnosing diseases of patients? Introduction Medical imaging is one of the most beneficial discoveries made in this century since it has provided medical professional with the visualisation of the internal structure of human body. This visualisation is of great significants to the medical professionals in diagnostics and the treatment of diseases. Imaging is obtained by using a source such as X-ray, ultrasound, gamma ray photons

Firstly, Positron Emission Tomography and Magnetic Resonance Images are taken as input for preprocessing Positron Emission Tomography images firstly decomposed into removal of noise and enhancing the input images using Gaussian filter to sharpen the input images filtering used high or low pass region carries more automatically and spectral information. This region decomposed by applying four level discrete wavelet transform. After this authors have combine high frequency coefficient of Positron Emission

characteristic nature of producing radiation and their energies. Isotopes are used in various areas like industries, agriculture, medical field and research centers. They are decayed by emission of energy in the form of alpha, beta (electron) beta plus (positron) and gamma rays. (1) Types of radiation Alpha particles cannot be used for measurement from outside the body because they are such low penetrating power. A sheet of paper stops alpha particles. Beta particles have a modest penetrating power, thus

founts of radium inside or near tumors. 1936 John Lawrence made an artificial radionuclide when he treated a leukemia patient using phosphorus-32. 1962 David Kuhl introduced the basis of what would become SPECT (single positron emission computerized tomography) and PET (positron emission tomography) scans. 1974 First PET scan camera built for human studies. 1983 Henry Wagner successful carried out the first PET scan of a neuroreceptor (membrane receptor protein that gets activated by a neurotransmitter)

functions; a low dose of radioactive agent is used for this study called a radiotracer. There are two different types of techniques used for myocardial perfusion imaging. The first is, single photon emission computed tomography (SPECT) and the second, positron emission tomography (PET). Myocardial perfusion imaging is commonly done for patients whose experience some type of chest discomfort, a recent myocardial infarction, or it may be used to access the blood flow to the myocardium that has been restored