What is detector efficiency in nuclear medicine? Detector efficiency refers to the ability of a radiation detector to register incoming photons as measurable events. It describes the proportion of emitted radiation that is successfully detected and recorded. In nuclear medicine,…
What is the difference between paralyzable and non-paralyzable dead time? The difference between paralyzable and non-paralyzable dead time lies in how a detector behaves when a second photon arrives during the dead time following a previous event. In a non-paralyzable…
What is dead time in radiation detectors? Dead time is the brief period after each detected radiation event during which a detector system is unable to record another event. During this interval, any incoming photons are not registered, leading to…
What is count rate in nuclear medicine? Count rate is the number of radiation detection events recorded by a detector per unit time. It is usually expressed in counts per second (cps). Count rate reflects how frequently gamma photons interact…
Why does increasing acquisition time improve image quality? Increasing acquisition time improves image quality in radionuclide imaging because it increases the number of detected photon counts. Since radioactive decay follows Poisson statistics, image noise is proportional to the square root…
What determines signal-to-noise ratio in radionuclide imaging? The signal-to-noise ratio (SNR) in radionuclide imaging is determined primarily by the number of detected photons (counts). Because radioactive decay follows Poisson statistics, signal increases in proportion to the number of counts (N),…
Why is noise proportional to √N in nuclear medicine imaging? In nuclear medicine imaging, noise is proportional to the square root of the number of detected counts (√N) because radioactive decay follows Poisson statistics. For a Poisson process, the variance…
What is the Poisson distribution in nuclear medicine? The Poisson distribution describes the statistical variation in the number of radioactive decay events detected over a given time interval. In nuclear medicine, radioactive decay is a random process, and the number…
What is transient and secular equilibrium in radionuclide generators? Transient and secular equilibrium describe the relationship between the activity of a parent radionuclide and its radioactive daughter in a decay chain, particularly when the parent has a longer half-life than…
How does a Tc-99m generator work? A Tc-99m generator is a system that produces technetium-99m (Tc-99m) from the radioactive decay of its parent isotope, molybdenum-99 (Mo-99). Mo-99 decays by beta minus emission to form Tc-99m, which can then be chemically…
