image receptor, is not in the center of the x-ray field, as is typically the case in general radiography. Rather, the central ray is located at the chest-wall edge of the image receptor (Figure 3.2). The "coverage" or the size of the x-ray field at the plane of the image receptor is determined by:
where C is the coverage, SID is the source-to-image-receptor distance and 0 refers to the effective x-ray tube target angle, the angle between the central ray and the surface of the target. The factors must be such that the x-ray field will just cover the 24 cm
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