. The principles and practice of roentgenological technique . Fig. 191.— I and II. The shadow of thesphere at a is smaller and sharper than theshadow at b. The shadow of the object withthe tube at c is smaller and sharper than withtube at d. (Grashey.) with the larger, hazier and more distortedshadow is the further from the recordingsurface. RADIOLOGICAL AXIOMS 143 Corollary: The closer an object lies to therecording surface, the less the deviation of itsshadow by displacement of the source Fig. 192 Application: This axiom is utilized in thelocalization of foreign bodies
. The principles and practice of roentgenological technique . Fig. 191.— I and II. The shadow of thesphere at a is smaller and sharper than theshadow at b. The shadow of the object withthe tube at c is smaller and sharper than withtube at d. (Grashey.) with the larger, hazier and more distortedshadow is the further from the recordingsurface. RADIOLOGICAL AXIOMS 143 Corollary: The closer an object lies to therecording surface, the less the deviation of itsshadow by displacement of the source Fig. 192 Application: This axiom is utilized in thelocalization of foreign bodies. Thus, witha certain deviation of the source of illumina-tion, the object furthest from the recordingsurface will move most while that which liesnearest the recording surface will move leastor not at all. Relationship of Source of Illuiiiiiiation toObject. 2. The further the tube is from the objectthe truer and the sharper will be its shadow.(Fig. 191).
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
