Screen-Film Radiography I

Screen-Film Radiography I PowerPoint PPT Presentation


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Projection radiography. Projection imaging refers to the acquisition of a two-dimensional image of the patient's three-dimensional anatomyRadiography is a transmission imaging procedureIn screen-film radiography, the optical density (OD) at a specific location on the film is (ideally) determined by the x-ray attenuation characteristics of the patient's anatomy along a straight line through the patient between the x-ray source and the corresponding location on the detector.

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Screen-Film Radiography I

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1. Screen-Film Radiography I Geometric principles Film cassettes Screen characteristics

2. Projection radiography Projection imaging refers to the acquisition of a two-dimensional image of the patient’s three-dimensional anatomy Radiography is a transmission imaging procedure In screen-film radiography, the optical density (OD) at a specific location on the film is (ideally) determined by the x-ray attenuation characteristics of the patient’s anatomy along a straight line through the patient between the x-ray source and the corresponding location on the detector

4. Basic geometric principles Two triangles that have the same shape (the three angles of one are equal to the three angles of the other) but have different sizes are said to be similar triangles If two triangles are similar, the ratio of the corresponding sides and heights are equal Similar triangles are encountered when determining image magnification and when evaluating image unsharpness

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