1. When an electron collides with a positron the two particles disappear, or annihilate, to create a high-energy photon.

2. The electron - positron pair may survive without recombining.

3. The positron is an antielectron.

4. The antielectron, or positron, was discovered in 1932.

5. This was confirmed by the positron annihilation technique.

6. Positron emission tomography imaging was performed to measure specific microvascular blood flow at rest and during pharmacological vasodilation by IV dipyridamole.

7. The Harvard group use positron emission tomography ( PET ) scans to monitor the brain activity.

8. The Positron lifetime spectra of unannealed and annealed Ni-coats, electro-plated from the four typical baths, have been measured.

9. Positron emission tomography ( PET ) is a non - invasive method to detect the distribution of radionuclide in vivo.

10. The antihydrogen atoms are composed of a positron (an antimatter electron) orbiting an antiproton nucleus.

11. Magnetized water samples were measured by the positron annihilation lifetime spectrometer.

12. It is found that positron at the grass- boundary can be trapped by zinc vacancies and vacancy defect.

13. One signature of positron - electron annihilation is gamma rays carrying 511 thousand electron - volts ( keV ) of energy.

14. Colonography comb in ining the imaging procedures of positron emission tomography (PET) and computed tomography (CT) provides whole-body tumor staging in as ingle session.

15. We investigate physicss properties of positronium and the way of positron - electron annihilation.

16. The applications of positron annihilation technique in the research of some metal - functional materials are introduced.

17. Objective To evaluate the value of high energy positron imaging in the diagnosis of colon neoplasm.

18. The nuclide chart involves electron, positron, antiproton, antineutron, photon to exhibit the symmetry of mass and charge ideally.

19. Objective To determine the usefulness of positron emission tomography(PET) with fluoro 2 deoxyglucose (FDG PET) in lung cancer.

20. Positron emission tomography ( PET ) is an imaging technique that combines a radioactive tracer with a molecule.

21. You can read more about Positron by viewing the Positron Company Profile.

22. The Dark Era begins when space is dominated by tiny particles such as photons, electrons and positrons.

23. The technologies of radionuclide section imaging tomograph included single photon emission computed of tomograph (SPECT) and positron emission computed tomograph (PET).

24. These new tests are resonance imaging ( MRI ) and positron emission tomography ( PET ) scanning of the heart.

25. Occasionally a collision produced an electron-positron pair, with the positron and antiproton flying off together and forming an antihydrogen atom./positron.html

26. An atom of antihydrogen, for instance, is composed of a negatively-charged antiproton being orbited by a positively-charged positron.

27. The vacancy defects of samples were measured by slow positron annihilation.

28. As an example with the injector linac for Beijing Electron Positron Collider upgrading project (BEPCII), the beam orbit offset caused by the above error effects have been simul...

29. After an immeasurably short time interval, the electron - positron pair recombine.

30. If we are a very professional high - energy physicists, using electron - positron collider experiments.

31. The electron, for example, has negative charge, whilst its antiparticle, called the positron, has positive charge.

32. Both rely on mathematical calculations to determine the location from which a positron or phot on was emitted.

33. The quality of the LM soap film crystal is determined by means of the positron annihilation life spectroscopy.

34. How few cancer cells can be detected positron emission tomography?

35. The high-voltage plateau curve, pulse amplitude distribution and efficiency curve were measured with electron and positron beams.

36. This is the mathematical basis of computed tomography and positron emission tomography.

37. As for the electron - positron collider, first I want to tell you a story.

38. Objective : To discuss the nursing countermeasure for receiving high quality Positron Emission Tomography ( PET ) image.

39. Partial volume effect(PVE) and their influence factors for positron emission tomography(PET) were investigated with computer simulation and experiments.

40. The TESLA positron injector linac with a L-band TW normal conducting structure has been studied, which offers both higher shunt impedance and larger aperture.

41. Studies of electrophysiological positron emission tomography and patients have provided important evidence supporting this viewpoint.

42. The stability of up - quenched Cu - 25 . 0 Zn - 4.20 Al ( wt . % ) alloy has been studied by positron annihilation and X - ray diffraction.

43. Molecular imaging with positron emission tomography ( PET ) is an important field of molecular imaging.

44. Scatter coincident events are the important factor that affects the quality of positron emission tomography ( PET ) images.

45. In this case, the telltale signal is gamma-rays at energies of 511,000 electron volts -- evidence that an electron/positron pair has annihilated.

46. Next the antiatoms encounter a strong electric field that strips apart the antiproton and positron of the weakly bound antiatoms.

47. Optical absorption spectra and positron annihilation radiation Doppler broadening were measured at room temperature.

48. Positron and electron (particle and anti-particle) can annihilate in collision turning into electromagnetic radiation.

49. An electron with a negative charge,(http://) as contrasted with a positron.

50. The vacancy - defect properties were measured by slow positron annihilation, and mechanical behaviors were studied using nanoindentation.

51. According to the values of the life time of positron annihilation, the model of positron annihilation in the rare-earth polyacetylene was proposed.