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Additionally, the focal spot of the x-ray tube is normally located directly above the chest-wall edge of the image receptor and as mentioned above, the focal-spot size should be measured at the chest wall. However, the nominal size is not usually referenced to this location. The nominal size of the focal spot in National Electrical Manufacturers Association standards is defined along a

TABLE 3.5—National Electrical Manufacturers Association focal-spot tolerance limits (NEMA, 1992).

AT . , „ , „ . „. Maximum Focal-Spot Size (feff) Nominal Focal-Spot Size ___'ett_

TABLE 3.5—National Electrical Manufacturers Association focal-spot tolerance limits (NEMA, 1992).

AT . , „ , „ . „. Maximum Focal-Spot Size (feff) Nominal Focal-Spot Size ___'ett_

(mm)

Width (mm)

Length (mm)

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