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Radiographic Exposure- Unit 4: Exposure Technique
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- 1A quality radiographic image accurately represents the:Anatomic area of interest
- 2The _____ of the anatomic structures & the ______ of their structural lines recorded determine the overall ______ of the radiographic image.Visibility
Accuracy
Quality - 3Visibility of the recorded detail refers to the _____ & _____ of the image.Brightness
Contrast - 4Amount of luminance (light emission) of a display monitor.Brightness
- 5Amount of overall blackness on the processed image.Density
- 6Another term for brightness.Density
- 7The primary factor that affects the amount of brightness/density produced in an image is the amount or quantity of radiation (_____) reaching the IR.mAs
- 8____ ____ has more of an effect on the brightness of the image rather than mAs.Computer Processing
- 9A lack of contrast makes an object appear:Homogenous
- 10Differences in the brightness levels or densities.Contrast
- 11The range of brightness levels is a result of the _____ differential attenuation of the x-ray photons.Tissues'
- 12What tells you that you used the correct technique factors that the IR received?Exposure Indicator
- 13The four MAJOR things to evaluate for a properly exposed radiograph is:Detail
Distortion
Contrast
Density - 14Sets the midpoint of the range of densities visible in the image.Window Level
- 15Moving the window down down to a low pixel value (Decreases/Increases) ______ the brightness on the display monitor.Decreases
- 16Moving the window level up to a high pixel value (Decreases/Increases) ______ overall brightness on the display monitor.Increases
- 17______ controls the radiographic contrast.Window Width
- 18A narrow window width means:Lower Contrast
- 19A wider window width means:Higher Contrast
- 20The product of mAs is:mA & Time
- 21Directly proportional to the amount (quantity) of radiation.Milliamperage (mA)
- 22Directly proportional to radiation quantity.Exposure time (Time)
- 23mA X Time =mAs
- 24As mAs is increased, the quantity of radiation reaching the IR is (Increased/Decreased) _______.Increased
- 25As mAs is decreased, quantity of radiation reaching the IR is (Increased/Decreased) ______.Decreased
- 26A visible change in density requires a minimum amount of change in mAs be ______.30%
- 27mA & time have an inverse proportional relationship when _____ the same mAs.Maintaining
- 28Doubling or halving your mAs means you're:Doubling or halving your density.
- 29This alters the amount & penetrating ability of the x-ray beam.Kilovoltage
- 30Increasing or decreasing the ____ changes the amount of radiation exposure to the IR, and the contrast produced within the image.kVp
- 31A change of 15% in kVp will cause a doubling or halving of the density on the radiograph. (The same way doubling/halving the mAs affects on image)15% Rule
- 32Quantum Noise/Mottle occurs because of:Low mAs
- 33Over exposure to the patient occurs because of:High mAs
- 34When increasing the kVp by 15%, you need to decrease the mAs by ____.Half
- 35When decrease the kVp by 15%, you need to increase the mAs by ____.Double
- 36Maintaining the density by applying by the ___ Rule.15% Rule
- 37The controlling factor of contrast.kVp
- 38An increase in ____ causes a difference in the X-ray tube because it's causing more energy photons.kVp
- 39When an anatomic structure shows up too white, you need to _____ kVp because to much was absorbed & NOT reaching the IR.Increase kVp
- 40What are the technical factors affecting density?kVp
mAs - 41What are the geometric factors affecting density?SID
FSS
Anode Heel Effect - 42What materialistic factors affect density?Filtration
Beam Restriction
Grids - 43Distance or SID will alter the _____ of the x-ray beam reaching the IR according to the inverse square law.Intensity
- 44Increased kVp yields increased _____.Scatter Radiation
- 45SID or Distance affects the amount of radiation reaching the _____ & _____.Patient & IR
- 46As the distance increases, the same amount of radiation will spread over an area that is created than the original, decreasing the beam's ______.Intensity
- 47X-ray photons diverge as they travel _____ from the source.Away
- 48If the distance is (Longer/Shorter) ______, the photons of not diverge as much & are then concentrated on a smaller area.Shorter
- 49The intensity of the x-ray beam is _____ proportional to the square of the distance from the source.Inversely
- 50Increase distance (SID), ______ (Increase/Decrease) the intensity of the beam, which (Increases/Decreases) _____ the density on the image.Decreases & Decreases
- 51The intensity of the x-ray beam is inversely proportional to the square of the distance from the source.Inverse Square Law
- 52A (Smaller/Larger) _______ focal spot will utilize greater incident electron stream vs. (Small/Large) _______ focal spot.Larger/Small
- 53______ Only affects density when unit not calibrated correctly.Focal Spot Size
- 54_______ Involves the intensity of radiation within the x-ray beam & the effect that this would have on the density on the image.Anode Heel Effect
- 55Anode Heel Effect depends on:-SID
-Field Size
-Part
-Angle of Anode - 56Anode Heel Effect is more pronounced:-Collimation is wide open
-With a large IR
-With shorter SID
-Steeper Anode Angle - 57You should only repeat an image technique wise if you need to make a ______ change.50% Change
- 58Two #'s to remember mAs with when changing techniques.-30%
-Double/Half - 59Photons are created at the ______.Focal Spot
- 60The smaller the focal spot, the better the _____.Detail
- 61The bigger the focal spot, the worse the ______.Detail
- 62Manufacturers automatically control the ______ of radiation that the focal spots cam produce.Quantity
- 63Focal Spot routinely affects density? (TRUE/FALSE)False
- 64The Anode side of the tube, the beam is (More/Less) _______ intense. On the Cathode side of the tube, the beam is (More/Less) ______.-Less
-More - 65Beam intensity is measure in ______Roegtan or milliroegtan
- 66______ of the beam is not uniform throughout all parts of the beam.Intensity
- 67The variation in beam intensity is greater at a ______.Shorter SID
- 68Variation of intensity can be as much as ______% change between anode & cathode sides. **Can be more pronounced with steeper angle**45%
- 69The anode should be placed at the _____ of the bed.Head end of the table
- 70______ body part should be towards the cathode.Thickest
- 71______ part if the body should be towards the anode side of the table.Thinner
- 72The intensity of the beam is greater at the _______ side of the X-ray tube.Cathode
- 73Have a proper placement of the part means a more uniform density along the ______ ______ of the image.Long Axis
- 74Beam is weaker on the anode side of the tube than on the cathode side (Put anode side of tube by thinnest body part in the beam).Anode Heel Effect
- 75______ affects x-ray quantity. **Results in higher beam quality**Filtration
- 76Even though filters reduce the intensity of the primary beam, they do NOT reduce the intensity of the ____ ____ reaching the IR.Remnant Beam
- 77Radiographic density will (Increase/Decrease) ______ whenever filtration is added.Decrease
- 78Beam restrictors includes:-Collimation
-Aperture Diaphragms
-Cones/Cylinders - 79Reducing field size will ______ density. (Increase/Decrease)Decrease
- 80Why does reducing the field size decrease density?Because it will decrease unwanted scatter.
- 81The purpose of a grid is to remove:Scatter before it reaches the IR.
- 82The higher the grid ratio, the (More/Less) _____ for density.Less
- 83Adding, removing, or changing grids require an adjustment in _____ to maintain radiation exposure to the IR.mAs
- 84The amount of the beam that is absorbed by the patient depends on:-Thickness of part
-Type of tissue (Atomic #)
-Contrast Material
-Pathology - 85Thickness of body part can be altered by:-Patient's Age
-Pathology
-Body Habitus
-Body Development (PEDS/GER/ADULT)
-Cast Materials
-Tube Angulation
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- Fichas sobre Radiographic Exposure- Unit 4: Exposure Technique, creado por Alex Ertmer el 28/09/2017.
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- Alex Ertmer
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