Merrill's Chapter 34 Nuclear Medicine Questions and Answers
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Course
NucMed
Institution
NucMed
Merrill's Chapter 34 Nuclear Medicine Questions and Answers
Naturally occurring radionuclides
are not used for nucmed imaging because of the high patient dose
Half-life (T1/2)
the time it takes the nuclide to decay to half its original activity
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Merrill's Chapter 34 Nuclear Medicine
Questions and Answers
Naturally occurring radionuclides - answer are not used for nucmed imaging because
of the high patient dose
Half-life (T1/2) - answer the time it takes the nuclide to decay to half its original
activity
The most common radionuclide in nucmed - answer Technetium (99mTc)
One desirable characteristic on an imaging pharmaceutical - answer primary photon
energy between 100-140 KeV
Scintillation detectors or gamma cameras - answer use crystals that change
radioactive emissions into light photons
The crystal used in gamma cameras - answer is made of thallium-activated sodium
iodide
Collimators are used in nuclear medicine - answer to keep scatter rays from entering
the camera
An array of photomultiplier tubes - answer is located to the back of the crystals
Unwanted photons or "noise" are reduced - answer by using a collimator
SPECT imaging produces images - answer similar to those done in CT
Positron-emitting radionuclides - answer have a neutron or proton deficient nucleus
The radiotracers for PET scanning - answer are chosen for its similarity to naturally
occurring biochemical
When a positron and an electron combine, - answer the result is annihilation
radiation of two photons of 0.511 MeV
PET Scanning is an examination - answer that can look at a patient's physiology
PET scanners need to be close to the source of positrons - answer because of the
short half-lives of the nuclides
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