grids, filtration Word Scramble

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Question	Answer
a device that moves the grid during a radiographic exposure is called a	Potter-Bucky diaphragm
a fixed kVp technique is fixed for a specific	range of part thickness
a grid absorbs	scatter radiation
a grid is used to improve	distortion
a Potter-Bucky diaphragm must move the grid___to the direction of the grid lines	perpendicular
a Thoreaus filter combines all of the following except; silver, copper, tin, aluminum	silver
air produces a ___image receptor exposure than any other body substance	greater
all filtration can be expressed in terms of the thickness of	Al/Eq
angulation across the long axis of a linear grid causes	grid cut-off
as a general rule, a grid is employed when the body part thickness exceeds___cm	10
as a general rule, a grid is employed when kVp exceeds	60
as kVp increases	scatter increases
as the lead content of a grid increases	the ability of the grid to remove scatter increases
attenuation is greater for elements with more___with which the photons may interacts	electrons
bone produces less image receptor___because it attenuates the x-ray beam more than soft tissue does	exposure
establishing the kVp steps in___cm increments permits simple halving or doubling of mAs to maintain density	4 to 5
filtration affects patient dose by	removing low-energy photons
filtration has what affect on patient dose	it decreases patient dose
filtration is the process of eliminating undesirable___by the insertion of absorbing materials into the primary beam	low-energy incident electrons
filtration permits the radiograper to___the photon emission spectrum into a more useful beam	narrow
fixed kVp systems	decrease patient dose, reduce x-ray tube wear, decrease time settings
fixed kVp systems	increase the consistency of image density, increase the consistency of image contrast, lengthen exposure latitude
fixed kVp systems	produce more scatter radiation than other systems
for a grid to be properly focused, the x-ray tube must be located along the___line	convergence
for a variable kVp exposure technique system, the kVp is primarily varied according to	measured body part thickness
how many half-value layers must be added to the primary beam to reduce its intensity to less than 20 percent of its original value	3
in a fixed kilovoltage system, the___is held constant	kVp
in a fixed kVp system, the kVp is held constant	for a given range of subject densities, contrasts, while the mAs is varied to achieve appropriate image density
in general, low-energy x-ray photons	are absorbed by the patient
in the early days of radiography, it was common practice to use a change of___kVp for every one cm of tissue thickness plus a constant	2
most of the inherent filtration of a typical x-ray equipment comes from the	wedge filter
once phantom images have been produced, they must be shown to	diagnosing radiologists and image quality control radiographers
photon absorption within the body occurs as the result of	photoelectric interaction
photons that pass through the body unaffected produce	radiographic contrast
steps formed for a variable kVp exposure system should be in groups of___cm increments	5
technique systems function best when a	large number of variables can be held constant, single factor is permitted to vary, method of consistency is used to produce a quality image
the advantages of the fixed kVp technique system include each of the following except; decreased contrast, decreased recorded detail, decreased mAs, max possible kVp	decreased contrast
the amount of material that will reduce the intensity of the primary beam to one-half its original value is the	half-value layer
the amount of scatter radiation increases with a/an	increase in patient thickness, larger field size, decrease in atomic number of the tissue
the collimator device is considered part of the___filtration	added
the degree of differential absorption is referred to as	subject contrast
the device used to measure part thickness is called a	caliper
the effective use of a variable kVp technique chart requires	precise part measurement
the greatest source of scatter during a radiographic exam is the	patient
the half-value layer is typically expressed in	Al/Eq
the higher the kVp, the	lower the patient dose
the interaction that produces scatter radiation is called___interaction	compton
the kVp has a profound effect on	contrast, type of interaction, average photon energy
the mAs values for a fixed kVp system must be set at minimum increments of ___percent	30
the most common filter material used is	aluminum
the number of grid lines per inch is the grid	frequency
the objective of optimal kVp is to determine the	highest kVp & lowest contrast
the optimal kVp must ensure	sufficient penetration of the subject, acceptable radiographic contrast, the availability of diagnostic information
the primary variable of a fixed kVp system is	mAs
the problem of unequal subject density is solved by a	Thoreaus filter
the purpose of moving the grid is to blur the	radiopaque strips
the radiopaque strips	absorb scatter, are made of dense material, have a high atomic number
the ratio of the height of the lead strips to the distance between the lead strips is the grid	ratio
the use of the max kVp as optimal causes a corresponding decrease in	mAs
the___the bidy part, the___the attenuation	thicker, greater
to reduce or eliminate the need for patient exposures, a___is used to develop a variable kVp exposure system	PEP
total filtration is equal to the sum of___filtration	inherent and added
variable kVp systems	produce higher contrast images than other systems do, enhance the visibility of detail, increase the perception of resolution
what term describes filtration that is part of the x-ray tube, the tube housing, and the collimation device	inherent
when AEC systems are used, the selection of___ factors is eliminated	time
when an x-ray beam passes through the body	it will pass throught the body unaffected, be absorbed by the body, interact with the body and change direction
when establishing a technique chart, the initial step involves	producing phantom images
when the lead strips run in a single direction in a grid, the grid pattern is described as	linear
when viewing phantom images, professionals are not asked to select the	single best image
which grid would have the greates distance between lead strips	6:1
which grid would most effectively reduce scatter	15:1
which of the following elements would attenuate a greater percentage of the x-ray beam; hydrogen, barium, oxygen, carbon	barium
which of the following elements would attenuate a lesser percentage of the x-ray beam; hydrogen, barium, oxygen, carbon	hydrogen
which of the following materials are used as a filter; glass, oil, aluminum	all of the above
___ compensating filters is used most commonly in thoracic spine radiography	wedge
the thickest portion of the wedge filter is placed over the less dense part of the patient	true
a grid is a series of radiopaque strips that alternate with radiolucent interspace strips	true
which term best describes the filtration that occurs as the primary beam passes through the glass window of the x-ray tube	inherent

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