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Extra info for Basics of PET Imaging Physics, Chemistry, and Regulations
Note that less than N/2 detectors can be connected in coincidence. These fan-beam projections form for each Figure 2-5. The transverse ﬁeld of view determined by the acceptance angles of individual detectors in a PET scanner. Each detector is connected in coincidence with as many as half the total number of detectors in a ring and the data for each detector are acquired in a “fan beam” projection. All possible fan beam acquisitions are made for all detectors, which deﬁne the FOV as shown in the ﬁgure.
Because of the scanner’s weight and heavy electrical requirement, a concrete pad with enhanced electrical connections must be built at the client site to support the weight of the mobile system. This ensures the correct leveled positioning of the van at the site. The power supply (typically 430 V, 3 phase at 60 Hz) is provided at the client’s site. Also, a generator is installed in the van to run chillers and air conditioning during transportation to keep PET scanners at operating temperatures.
Typically, each block detector is about 3 cm deep and grooved into an array of 6 ¥ 8, 7 ¥ 8, or 8 ¥ 8 elements by making partial cuts through the crystal with a saw. The cuts are made at varying depths, with the deepest cut at the edge of the block. The 8 X 8 grooves cut into BGO crytals PM tubes Figure 2-2. A schematic block detector is segmented into 8 ¥ 8 elements, and 4PM tubes are coupled to the block for pulse formation. ) 26 2. PET Scanning Systems grooves between the elements are ﬁlled with an opaque reﬂective material that prevents optical spillover between elements but facilitates sharing of light among the PM tubes.