section of the two planes obtained by the tworadiograms taken at right angles the one to the other. In takingthe second or cross photograph, the lamp should be placed atexactly the same distance from the plate as in the first exposure.It should also be over an exactly corresponding part of the… … A/ Fig. 72 (Walsh). angles. In practice, however, the results are not so easily obtain-able as might be inferred from the foregoing explanation. In theabove case, for instance, there would be greater difficulty in pene-trating the long axis of the skull, and a somewhat longer exposurewould be…
X-rays · Radiography
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