• radioactive
  • When a gamma photon leaves the patient (who has been injected with a radioactive pharmaceutical), it knocks an electron loose from an iodine atom in the crystal, and a faint flash of light is produced when the dislocated electron again finds a minimal energy state. (wikipedia.org)
  • In order to obtain spatial information about the gamma-ray emissions from an imaging subject (e.g. a person's heart muscle cells which have absorbed an intravenous injected radioactive, usually thallium-201 or technetium-99m, medicinal imaging agent) a method of correlating the detected photons with their point of origin is required. (wikipedia.org)
  • The iodine introduced during manufacture is a radioactive isotope, I-123, and it is the properties of this isotope that makes the solution visible to a gamma camera. (wikipedia.org)
  • X-ray radiography is similar to gamma-ray radiography but instead of using a radioactive source, it uses a high-energy bremsstrahlung spectrum with energy in the 5-10 MeV range created by a linear particle accelerator (LINAC). (wikipedia.org)
  • energy
  • A dual energy x-ray source that delivers two different energy levels provides quantitative information regarding the object being imaged using dual photon absorptiometry techniques. (freepatentsonline.com)
  • A Dual Energy Photo Absorbtion Technique for Measurement of Bone Mineralization of the Spine Using a Gamma Camera", abstract by Wilson, C. R. et al. (freepatentsonline.com)
  • Nuclear Medicine exams differ from other x-ray procedures because the energy (x-rays and photons) come from different sources. (peacehealth.org)
  • The total sum of the voltages from each photomultiplier, measured by a pulse height analyzer is proportional to the energy of the gamma ray interaction, thus allowing discrimination between different isotopes or between scattered and direct photons. (wikipedia.org)
  • Very-high-energy (VHE) gamma rays offer a unique insight into some of the most extreme phenomena of our Universe. (wikipedia.org)
  • The cobalt-60 units use gamma photons with a mean energy 1.25 MeV, which can penetrate up to 15-18 cm of steel. (wikipedia.org)
  • They provide very little information on energy of detected photons, and as a result, they were criticized for their inability to distinguish gammas originating from nuclear sources from gammas originating from a large variety of benign cargo types that naturally emit radioactivity, including bananas, cat litter, granite, porcelain, stoneware, etc. (wikipedia.org)
  • decay
  • Especially because of the internal conversion decay channel, I-123 is not an absolutely pure gamma-emitter, although it is sometimes clinically assumed to be one. (wikipedia.org)
  • detect
  • To detect these flashes of Cherenkov light, photomultiplier tube cameras are used at the focus of large tracking light collectors. (wikipedia.org)
  • images
  • The iodine is taken up by the thyroid gland and a gamma camera is used to functional images of the thyroid for diagnosis. (wikipedia.org)
  • After the tracer has been injected, images are typically taken by a gamma camera at 24, 48, and in some cases, 72, and 96 hours later. (wikipedia.org)
  • patient's
  • The parathyroid gland takes up 99mTc MIBI following an intravenous injection, and the patient's neck is imaged with a gamma camera to show the location of all glands. (wikipedia.org)
  • bone
  • Quality Assurance of Gamma Camera as an Imaging System for Bone Mineral Content Evaluation", Abstract by Hoory, S. et al. (freepatentsonline.com)
  • 5. The system of claim 3 wherein said collimator means includes a fan-beam collimator with a slit of the collimator being parallel to a bone of said selected skeletal section and a line of focus of said fan-beam camera collimator being at the source means. (freepatentsonline.com)
  • energies
  • Detection of celestial VHE gamma rays allows the study of exotic objects like pulsars, pulsar wind nebulae, super nova remnants, micro-quasars, active galactic nuclei etc where particles are accelerated to TeV (10 exp 12 eV) energies and beyond. (wikipedia.org)
  • projections
  • For example, a dual-headed camera can be used with heads spaced 180 degrees apart, allowing two projections to be acquired simultaneously, with each head requiring 180 degrees of rotation. (wikipedia.org)
  • detection
  • A high-resolution imaging camera weighing about 1200 kg, for detection and characterization of the atmospheric Cherenkov events, forms the focal plane instrumentation of the telescope. (wikipedia.org)
  • They are more suitable for the detection of special nuclear materials than gamma-ray systems. (wikipedia.org)
  • image
  • A second image is obtained after a washout time (approximately 2 hours), and mitochondria in the oxyphil cells of the abnormal glands retaining the 99mTc are seen with the gamma camera. (wikipedia.org)
  • This gamma camera is able to produce one column of an image. (wikipedia.org)
  • body
  • The Gamma Camera must be very close to you and will be moved over your body to obtain the pictures. (peacehealth.org)
  • Special medical equipment may be used, such as fiber optic cables, miniature video cameras and special surgical instruments handled via tubes inserted into the body through small openings in its surface. (wikipedia.org)
  • This marriage allows the combination of ligand and radiopharmaceutical to be carried and bound to a place of interest in the body, where the ligand concentration is seen by a gamma camera. (wikipedia.org)
  • technique
  • However, given the low cost of a gamma camera and its additional flexibility compared to a dedicated PET scanner, this technique is useful where the expense and resource implications of a PET scanner cannot be justified. (wikipedia.org)
  • capture
  • The highly efficient capture method of this combination for detecting gamma rays was discovered in 1944 by Sir Samuel Curran whilst he was working on the Manhattan Project at the University of California at Berkeley. (wikipedia.org)
  • similar
  • The initial phenomenon of the excited electron is similar to the photoelectric effect and (particularly with gamma rays) the Compton effect. (wikipedia.org)