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film placement

cassette is perpendicular to the floor, long axis of cassette is positioned horizontally

head position

left side of the patients head is adjacent to the cassette, midsagittal plane is perpendicular to the floor and parallel to the cassette, frankfort plane is parallel with the floor, head is centered over the cassette

beam alignment

central ray is directed through the center of the cassette and is perpendicular to the cassette

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