PET intro 1
What is a positive electron called?
What is positron
T or F scattered coincidences reach the detectors within the time window and are recorded as a coincidence event
What is T
the ____ matter in the brain always has a high uptake of FDG
What is gray
There are 2 methods of particle accelerators, name one
What is linear accelerator and cyclotron
Amyloid PET tracers include:
18F-florbetapir, 18F-florbetaben, 18F-flutemetamol
A true coincidence will be ____ degrees
What is 180
What does SUV stand for
What is standard uptake value
F18-FDG is used in cardiac imaging to check for _____
What is viability of the heart
Name one thing that affects scatter
What is amount of radioactivity, size and density of object and location of object to the detector
The patient should be NPO for a minimum of __-__ hours before a PET scan using FDG
What is 4-6
Positron-emitting radionuclides are most commonly produced in a ____.
What is cyclotron
composite of all the raw data is called a
What is sinogram
Name 2 areas of normal FDG uptake
What is brain, liver, kidneys, bladder
path between the two detectors
What is line of response
A CT functions as a ________scan in the PET/CT.
What is transmission?
Name at least 3 nuclides used in PET
What is Carbon11, Nitrogen13, Oxygen15, Fluorine18, Rubidium82
Name one purpose of the tungsten or lead septa that sit inside the ring of crystals
What is limits the fov of events to within the same detector ring and reduces scatter and random events
Name 1 radionuclide that is used for prostate cancer
What is C11?
What is F18?
What is Ga68?
____ _____ is determined by the size of crystals and their separation
What is spatial resolution
18F-florbetapir, 18F-florbetaben, and 18F-flutemetamol have trade names :(in order)
18F-florbetapir = Amyvid
18F-florbetaben = Neuraceq
18F-flutemetamol = Vizamyl
What is does the coincidence time window do?
It acts as a discriminator for the events produced. As long as the events fall within the timing window then they are counted as "coincidence events" (true or otherwise)
Name one of the reconstruction techniques used for PET/CT images.
What is iterative reconstruction, filtered back projection, OESM
A patient with Alzheimer's will have ____ uptake in the brain tissue when using F18-FDG.
What is decreased?
Explain how the kinetic energy of the emitted positron affects the eventual image resolution.
Higher kinetic energy the positron will travel further from the source therefore lowering the overall image resolution.
What will happen if a patient "carb loads" days prior to his/her PET scan?
More than likely there will be muscle uptake and minimal target uptake of the FDG