![]() ![]() If detailed or nongrid is listed, a slower speed film screen combination is suggested, such as those found in extremity cassettes or 100-speed cassettes. If the use of a grid is listed, a fast film screen combination such as rare earth is suggested. The kV and mAs section lists the type of film screen combination used and whether the study is performed with the use of a grid or table top. For each setup in the tables, there is a picture demonstrating the position and central ray placement and another to exhibit the anatomy demonstrated by the setup. To conserve x-ray film and facilitate viewing, sometimes the film is divided so that multiple views of a body part are seen on a single film ( Fig. In E, the patient is in a left anterior oblique (LAO) position, and in F the patients is in a right anterior oblique (RAO) position, both corresponding to posteroanterior oblique projections.Įach table explains the position setup, central ray placement, tube angulation, optimal film size, and focal film distance for each view. For example, C indicates a lateral projection in a right lateral position and D indicates a lateral projection in a left lateral position. Position denotes the placement of the patient’s body, specifically the portion of the patient’s anatomy that is in contact with the Bucky. However, when one deals with the head, neck, or body tunk, the lateral and oblique projections are further clarified by the specific “position” of the patient. In the extremities, lateral projections are similarly described by the direction of the central ray hence, mediolateral and lateromedial projections are possible. For example, A denotes an anteroposterior (AP) projection and B a posteroanterior (PA) projection. The term radiographic “projection” references the path of the central ray as it exits the x-ray tube and passes through the patient’s body.
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