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Merrill Chpt 2

Compensating Filters

What structures have varied tissue of thickness & density? AP Thoracic spine, Lateral Hip & Lateral Cervicothoracid spine (swimmer's)
Certain filters also decrease skin entrance exposure by? Absorption of low-energy photons (decreasing dose to patient)
What are specially designed attenuating devices that produce images with even density on anatomic structures that vary significantly in tissue thickness? Compensating filters
T/F: Without the use of a compensating filer, images of anatomy with varying tissue thickness would require 2 exposures or be of suboptimal quality? True
What is the simplest and most common filter shape? Wedge
The wedge is made of what material? Clear leaded plastic (Clear-Pb)
Where are the most compensating filers placed? A. Under the IR; B. Between grid & IR; C. Between the tube and the patient; D. Between patient and the IR C. Between the tube and the patient
The trough is made of what material? Aluminum
Is the boomerang A. collimator mounted or B. contact? B. Contact
Blocks the field of light when placed between tube and patient, makes positioning more challenging, & must complete positioning before mounting filter to collimator. These are all? Disadvantage of aluminum filters
Which compensating filter is used for AP projections of the thoracic spine? Trough
Which compensating filer is used for AP projections of the hips, knees, ankles, and long axis of T-spine, foot, & upright abdomen? Wedge
The boomerang filer is used in AP projections of? Shoulder and facial bones
The _________filter has 2 models for lateral and oblique projection use Ferlic
Which filter material can become objectionably heavy, if made for certain exams? Leaded plastic
What is the unique composition of the boomerang filer? Silicon rubber
The physical principles of filters is in? Shape, Composition & placement
The shape and composition of a filter depends on _______to be imaged? Body part
What filter is used on body parts that vary in thickness along the long axis? Wedge
Numerous special shapes have been designed for more technically challenging exams, which filters are these? Trough, Ferlic, Boomerang
What are the 2 categories of filer placement? Collimator-mounted & contact
What 2 places can contact filters be placed? On patient & between patient and IR
T/F: When placed on patient, the filter decreases skin entrance exposure? True
What filter is used on parts that are thin (less dense) on the edges & thick (more dense) in the center? Trough
What filter improves quality of lateral projections? Ferlic
Digital fluoroscopy uses specifically shaped filters to compensate for round image intensifier, they are? Convex and concave conical-shaped filters
CT uses what shape filter to compensate for the rounded shape of head? Bow-tie
What 2 ways is exposure reduced? Eliminate need for 2 separate images and many absorb low-energy radiation
Compensating filters that are placed between the primary beam and the patient have the additional advantage of: A. Not blocking the light; B. Being lightweight; C. Reducing patient dose C. reducing patient dose
Filters placed under the patient may cause ______, which can be objectionable to the radiologist? Artifacts
Which category of filters has no effect on patient exposure, A. Collimator-mounted, B. Contact? B. Contact
T/F: Digital radiology does not require the use of compensating filters False
T/F: Placement of a compensating filter between the anatomy of interest and the IR can produce objectionable artifacts True
T/F: Filters composed of aluminum block the field of light True
T/F: Filters composed of clear leaded plastic block the field of light False
T/F: Filters are specifically designed to be used with only one body part or radiographic exam False
T/F: Pediatric patients rarely require the use of compensating filters True
T/F: Collimator-mounted filters reduce patient exposure by hardening the primary beam True
T/F: The use of improvised filters, such as saline filled bags, is a recommended practice False
T/F: A wedge filter would be used to improve the image quality of the AP projection of the thoracic spine True
T/F: A "bow-tie" filter is a special filter for use in digital fluoroscopy False
Created by: swisscheese