About PET
1. What
is PET?
A Positron Emission Tomography
(PET) system is used to explore the metabolic activity inside a human body for medical
diagnosis. Radioactive tracer is
injected and the emitted positrons hit nearby electrons. The generated photon pair has 511 KeV
energy and travels along a line in opposite directions with the degree of angle
equals to 1800 
0.250. The direction
of this line is assumed to be uniformly distributed in space. The corresponding detector pair records
the photon pair as a coincidence event.
2. The
PET System in V.G.H.-Taipei:
The PET system used in
V.G.H.-Taipei is Scanditronix PET PC4096-15WB. There are 8 rings of BGO detectors with 512 detectors per
ring whose diameter equals to 101 cm.
The PET system scans 15 slices of sinograms which record the coincidence
events at 8 direct and 7 cross-plane (interplane) slices. The slice thickness is 7 mm and the transaxial field of view (FOV) equals to
55 cm. The usual resolution of
reconstructed image is set to be 128 by 128 pixels.
3.
Related WEB Sites:
Let's Play PET at UCLA V.G.H.-Taipei More Information about VGH-T