1. aspectos básicos da radiografia rx do trauma
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Transcript of 1. aspectos básicos da radiografia rx do trauma
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Radiographic Basics
Rui Domingues, MDLincoln Mental and Medical Center
September 2008
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What causes the blacks, whites and grays of an x-ray image?
X-ray beams contains x-ray photons of differing energies
As these photons pass through a patient…
Some are absorbed completely Some penetrated directly to the plain film Some are absorbed partially, and While others are deflected (Scatter)
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Tissue Density A product of the type of tissue and
the thickness of that tissue
Results in differential absorption
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Differential Absorption Penetration of the x-ray beam is
dependent on tissue density
Denser object = less penetration
Less beam striking the film (more absorption) = WHITER
More beam striking the film = BLACKER
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Glass Test Tube
Air
Fat
Water
Bone + Water
Metal
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Differential AbsorptionBlack Air (Lungs / Trachea / Outside the body)
Fat (Perirenal fat / Fascial plane)
Water (Muscle / Organs)
Bone (Bone / Atherosclerotic plaquing)
White Metal (Fillings / Markers / Ortho devices)
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Radiographic Image Adjacent structures of similar
densities are not visualized
Kidney (water density) against liver (water density)
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Radiographic Image Adjacent structures of different
densities are visualized
Liver (water density) next to Bowel (air density)
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References Felson’s Principles of Chest Roentgenology: A
Programmed Test, 2nd Edition. Goodman, Lawrence R.; W.B. Saunders Co., 1999.
Pocket Atlas of Radiographic Anatomy. Moller, TB et al.; Thieme Medical Publishers, 1993
Clinical Imaging with Skeletal, Chest and Abdomen Pattern Differentials, Dennis Marchiori, ed. (WN 180 M317c)