Control of Scatter Radiation... Radiographic Grids
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
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| What is the main reason for using a grid? | show 🗑
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| show | Grid ratio
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| Interspace material is... | show 🗑
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| _____ require sensors in the bucky drawer to measure the size of the cassette. | show 🗑
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| show | Compton
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| show | cassette size, primary beam
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| Sensors are located on the tube stand to monitor _____. | show 🗑
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| show | between the patient & IR
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| show | grid cut off
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| show | advantages of automatic collimation
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| show | Air gap technique
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| Mostly used inn cervical/chest area and SID must increase to compensate for increase in OID is ________. | show 🗑
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| show | focused moving grid
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| show | lead rubber masking
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| For the most patient protection use... | show 🗑
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| show | increase contrast
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| show | no grid
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| ____ reduce tissue volume and are helpful in controlling scatter. | show 🗑
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| show | increase magnification
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| show | reduction
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| show | 5:1 grid
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| show | grid
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| Grid ratio produces the least density with _____. | show 🗑
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| The most important way to reduce scatter production is ____. | show 🗑
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| show | Gustave Bucky
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| Grid composed of parrallel strips of lead/plastic | show 🗑
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| show | 90%
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| show | increased
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| show | 60 to 80
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| Which grid produces the longest scale of contrast? | show 🗑
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| show | parrallel
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| show | grid cut off
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| When the primary beam is absorbed by the lead strips this is called ____. | show 🗑
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| show | 16:1
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| Parrallel grids are used with techniques under ____ and with portable units. | show 🗑
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| show | angle longitudinally
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| show | focused grid
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| show | Moire Effect
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| Higher grid frequency = | show 🗑
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| show | 25%
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| Stationary to moving will increase patient dose ___. | show 🗑
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| show | cross hatch grid
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| With a cross hatch grid the least amount of positioning lattitude the ___ grid ratio | show 🗑
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| show | cross hatch grids
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| Angiography, trans table lateral fro mylegraphy, and shoot thru lateral hips use | show 🗑
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| Who invented the moving grid? | show 🗑
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| Moving the grid perpendicular to the direction of lead strips made them ____ | show 🗑
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| show | common causes of grid lines
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| What are the 3 types of moving grids? | show 🗑
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| show | reciprocating
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| show | canting
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| show | industrial radiograph
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| show | grid ratio/grid frequency
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| show | grid frequency
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| Ratio of the height to the distace is | show 🗑
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| As you increase grid ratio you ___ contrast and ____ density | show 🗑
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| show | clean up, higher
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| show | greater
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| Most portable are | show 🗑
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| show | 12:1
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| When converting from non grid to grid, change is best made by adjusting _____ | show 🗑
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| show | number of lead strips per inch
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| Higher grid frequency the more _____ in the grid | show 🗑
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| As grid frequency increases grid ratio must also _____ to maintain frequency and also ___ patient dose. | show 🗑
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| Less than _____ of density should be scatter | show 🗑
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| show | 1
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| show | 15%
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| show | 100 lines
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| show | precise seperation
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| What are the 2 most used interspace materials | show 🗑
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| May provide soem filtration of scattered x-rays, produces less visible grid lines, absorbs more primary beam requiring higher techniques | show 🗑
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| show | plastic fiber interspace material
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| Does not absorb moisture | show 🗑
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| ____ is easier to form and roll into sheets of precise thickness than ____ | show 🗑
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| Amount of secondary radiation (thickness, density) kilovoltage used, capacity of x-ray generator are all factor in _____ | show 🗑
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| show | lower
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| _____ is based on positioning lattitude along with other factors | show 🗑
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| The ___ the grid ratio the less positioning lattitude | show 🗑
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| Parrallel grids have more ___ than focused and cross hatch have no_____ | show 🗑
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| Grids should be used when the body part is atleast___ thick (some say ___) | show 🗑
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| show | grid cut off
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| show | primary cut off in a parrallel grid
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| To try and overcome ____ in a parrallel grid we make lead strips thinner as they move away from center | show 🗑
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| When the SID is greater or lesser than the focusing distance and shows proper density in the center of radiograph and cut off on lateral edges | show 🗑
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| show | off center, off level cut off
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| show | tube side vs film side
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