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Scatter Control 177

Part 1

QuestionAnswer
As kVp Increases penetration, Total Interactions ________ Decrease
higher kVp means there are _________ Less Interactions
Of those interactions that do occur with a higher kVp, more are ______ Compton
Scatter radiation decreases ________ Radiographic Contrast
Less ______ = Less Scatter Matter
Radiographic Grids Improve the image quality by absorbing scatter radiation that ______ the patient, reducing the amount of scatter that reaches the image receptor Exit
________ DO NOT protect the patient Radiographic Grids
Increasing collimation means _______ Decreasing Field Size
Decreasing collimation means _________ Increasing Field Size
Types of Beam Restricting Devices: Aperture Diaphragms Simplest type  A flat piece of lead (diaphragm) that has a hole (aperture) in it  Placed directly below the x-ray tube window
Types of Beam Restricting Devices: Cones and Cylinders An aperture diaphragm with a cone or cylinder extension (flange) attached to it
Types of Beam Restricting Devices: Collimators Equipped with: A white light source and a mirror to project a light field onto the patient  An x-ray field measurement guide in case of light failure  A plastic template with crosshairs
Both Cones and Cylinders limit unsharpness surrounding the image, but ________ is better Cylinder
A ______ Adjusts the primary beam size and shape to the size of the IR Positive Beam-Limiting Device
Tech's using Automatic Collimators (PBL) cannot increase primary beam to go outside the IR ________ Unless there is an Override Mechanism
Radiographic Grids are Devices that have very thin lead strips with _________ Radiolucent Interspaces (usually aluminum)
Radiographic Grids are Placed_______ the patient and IR Between
Using a Radiographic Grid Creates images with improved______ Contrast
Scatter is ______, therefore it's absorbed by lead strips Angled
__________ is the number of lead lines per unit length  EX: 40 lines per cm Frequency
_______ is the height of lead strip ÷ width of interspace  EX: height = 3.2 mm, interspace width = 0.2mm Ratio
Higher grid ratio = _______ More Scatter Absorbed
_________ are the preferred type of linear grid used by technologists Focused Grids
_______: lead lines run in only one direction  Parallel  Focused Linear Grids
______: lead lines run at right angles to one another Cross-Hatched Grids
Parallel Grids are always ______ Non-Focused
_______ lines are perpendicular to the long axis Short Dimension
_________ lines are parallel to the long axis Long Dimension
_______ Can also be short dimension or long dimension Focused Grids
A smaller area needs more______ mAs
Increasing Collimation will _______ Quantum Noise increase (without an appropriate increase in mAs)
Increasing Field Size will_______ Quantum Noise Decrease
Created by: user-2016295
 

 



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