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Image Contrast, Contrast Media and Principles of Nuclear Medicine …
Image Contrast, Contrast Media and Principles of Nuclear Medicine
Image Contrast
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Object Contrast
Difference in radiographic gray tones between two radiographed structures due to their physical differencees
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Contrast Mediums
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Positive Contrast Medium
Barium Sulphate
Positive effects
Biologically inert, not hypertonic, metabolised or absorbed by the body
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Iodinated Compounds
Ionic Contrast Media
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Examples
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Diatrizoate (Urografin, Hypaque)
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Purpose: Outline internal surface of hollow structures, vessels and ducts
Organ displacements, filling defects
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Double Contrast Studies
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Advantage
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Demonstration of filling defects without overshadowing #
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Scintigraphy
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Sensitive method to detect stress fractures and other occult fractures not identified on radiography
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