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31 Cards in this Set

  • Front
  • Back
Positron Decay
Have an excess number of protons
Lie below the line of ______
stability
Require accelerator for
production
Two 511 keV annihilation photons are emitted _______ degrees
180
Electron Capture
For lower transition energies, electron capture is an alternative decay mode for proton-rich isotopes.
Unlike larger/heavier charged particles,the positron does not travel in a straight path
It bounces around like billard ball
Detector Block
A group of crystals tied into a 1 detector with a PMT at the end
PET Sinograms
Sinograms make a lot more sense to the computers but not to us
Sinograms and projection views are different ways of showing the __________ data
same
Each pixel in the sinogram corresponds to a particular ____________ or detector pair
LOR/line of response
Delayed time window
a method for estimating and correcting the number of random in a PET acquisition
this works to some extent but creates a very
noisy correction adding to the overall NOISE of the PET image
As the count rate increases (patient dose)
randoms increase faster than true events
Delay Window Method
Estimated Trues = prompts - delays
2D
slower acquisition time
2D
limit scatter and gain in resolution
3D
septa are removed, a lot faster imaging time
3 D PET __________ drops off toward the edges
sensitivity
4-5 x increased _________ overall
sensitivity
Increased _________ from out of field activity
randoms
Time of Flight
LSO
LYSO
GSO
Time of flight
see notes......better for bigge3r patient bec. you have a larger %
Larger patient you have
3.3 x improvement
PEM
Positron Emission Mammography
CHB MicroPET scanner
done for research, mouse `
PET MRI
FDG Tumor imaging
Summary
Modern scanners designed for __________ imaging
oncology
All PET/CT sales are now
NO MORE DEDICATED PET SCANNERS
New scintillation detectors combine excellent detection efficiency and _________ decay time
short
Shorter decay time lead to the possibility of ________
time of flight PET
_______PET scanners can provide very high spatial resolution with high sensitivity in small foot print and easy access to the research animals.
MICRO