Download Nuclear Medicine: Practical Physics, Artifacts, and Pitfalls by Daniel A. Pryma PDF
By Daniel A. Pryma
Unlike so much anatomic radiographic imaging ideas, nuclear medication allows genuine time, non-invasive imaging of human body structure and pathophysiology and in addition enables beautiful concentrating on of ailment with healing radiology. To open this window to the strategies of human illness, one needs to first comprehend the actual procedures at the back of radioactive decay and emission, besides the foundations of radiation detection. sensible Nuclear medication Physics presents citizens and practitioners in nuclear drugs and radiology a readable rationalization of the physics techniques underpinning nuclear imaging and the way they impression the usage and interpretation of these pictures. Following a short introductory part, the booklet offers various case examples, illustrating numerous imaging artifacts and pitfalls that may be famous and remedied with a fantastic figuring out of the physics in the back of the process. figuring out and making use of the physics in the back of nuclear drugs is key to maximizing not just diagnostic and healing accuracy for delivering optimum sufferer care, yet "Practical Physics" is a required part of radiology residency schooling and a chosen region of the board assessments.
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Extra info for Nuclear Medicine: Practical Physics, Artifacts, and Pitfalls
Accessed April 17, 2013. Adapted with permission. 39 40 NUCLEAR MEDICINE dramatic multiplication of the initially released electrons. Finally at the end there is an anode wherein the electrons result in electrical current. That current is detected as the output signal from the PMT. Converting visible light into an amplified electrical signal is excellent, but the PMT has another critical capability: the total signal output from the PMT is proportional to the energy of the photon that initially hit the scintillator.
So far, we have talked only about the ionization electron being drawn to the anode. There is also the positively charged ionized atom being drawn to the cathode where it can receive an electron and return to ground state. , a neon sign); this photon could create its own ionization and its own avalanche, leading to an endless loop of avalanches in the system; thus, the system must be quenched. The halogen gas can interact with the ionized gas, absorbing its energy and charge to prevent the photon emission.
Thus, a higher Z number results in a higher likelihood of a photon stopping in the material and causing scintillation. 37 38 NUCLEAR MEDICINE The Z number is only one factor in determining the likelihood of stopping a given photon. Another factor is the thickness of the scintillator (the thicker it is, the less likely a photon could pass through it without being stopped). As with virtually everything related to system design, there are tradeoffs with scintillator thickness. A thicker scintillator results in higher sensitivity (a greater percentage of the photons that hit it are stopped and result in light output) but is heavier and more expensive.