![]() Underpenetrated at the lumbosacral junction. This avoids lateral lumbar films that are too dark at the top while being Then place the wedge filter so that the thick part of the wedge attenuates the x-rayīeam through the thinner waist, and the full amount of the beam is available to penetrate the dense pelvis. Measure side-to-side at widest part of hips and compute technique sufficient to penetrate that. For most lateral lumbar projections on females.This usually facilitates visualization of the difficult-to-see upper thoracic vertebrae without overpenetrating the lower thoracics. Inverted so that the thick part of the wedge attenuates the x-ray beam through the lower air-filled thorax, and the full amount of the beam is available Measure side-to-side across the shoulders, on the outside of the arms, and compute technique sufficient to penetrate that thick and dense region. (The only exception to using a filter on an AP thoracic projection would be for a male patient with unusually developed pectoral muscles (as a For virtually all AP thoracic projections.(Lateral full spine projections should be avoided rather, three separate sectional views should be produced toĪccompany the APFS projection. Too dark at the top and too light through the pelvis at the bottom. Measure and compute technique for the thickest part of the abdomen and place the thick part of the filter in front of the thinner thorax. Compensating filtration should be used in the following circumstances: Reaches the patient, thus providing the dual benefit of protecting the patient while obtaining a higher quality film. Wedge compensation occurs before the radiation Improper procedures would produce the compensation after the full amount of radiation had already passed through the patient's body. ![]() The gradual wedge design of the filter blends the difference between thick and thinnerĪttenuation so that no horizontal filter line shows on the finished radiograph.Īttempts to compensate for varying thicknesses in body parts should never be made by utilizing split or gradient intensifying screens or by blocking a portion of a screen, as these The filter is placed in front of the collimator (via a special adjustable filter holder, magnets, or even velcro) after collimating appropriately,īecause in most cases the filter is opaque and obliterates the light beam from the collimator. The thick part of such a wedge filter is designed to limit the amount of x-ray reaching a thinner (or less dense) body part, while the full intensity of the x-ray beam is allowed ![]() The classic example would be an AP full spine 14x36" projection, butįilters are also needed for other commonly-produced views. Of the primary beam so as to compensate for varying body part thicknesses in the same field of view. A simple or complex system of placing a discretionary metal filter (usually aluminum, usually wedge-shaped) in front of the collimator in order to attenuate (reduce) a portion
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