By Gopal B. Saha
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Additional resources for Basics of PET Imaging Physics, Chemistry, and Regulations
GSO and BGO detectors and NaI(Tl) and LSO detectors have been coupled in this manner for high-resolution scanners. The latter dual detector can be used for either SPECT or PET scanning by switching between the two detectors. Photomultiplier Tube As discussed brieﬂy earlier, a photomultiplier (PM) tube is needed to convert the light photons produced in the detector as a result of g-ray interaction to an electrical pulse. The PM tube is a vacuum glass tube containing a photocathode at one end, 10 dynodes in the middle, and an anode at the other end, as shown in Figure 2-1.
7. The number of BGO or LSO detectors in common PET scanners is of the order of (a) tens of; (b) thousands of; (c) hundreds of; (d) only a few detectors. 8. The number of rings in commercial PET scanners varies from (a) 50 to 100; (b) 5 to 10; (c) 18 to 32; (d) 1 to 5. 9. Explain how SPECT scintillation cameras can be used in coincidence counting. Discuss the advantages and disadvantages of these cameras in coincidence counting. 10. Why is PET/CT better than only PET in detecting various tumors?
Such counting is called the 2-dimensional (2-D) mode of data acquisition. In this mode, most of the random and scattered 511 keV photons from outside the ring are prevented by the septa to reach the detectors, leaving the true coincidences to be recorded (Figure 3-4A). The use of septa reduces the fraction of scattered photons from 30% to 40% without septa to 10% to 15%. Detector pairs connected in coincidence in the same ring give the direct plane event. To improve sensitivity in 2-D acquisition, detector pairs in two adjacent rings are connected in a coincidence circuit (Figure 3-4A).
Basics of PET Imaging Physics, Chemistry, and Regulations by Gopal B. Saha