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Rad Imag. 2

Ch 8-11

Question	Answer
Xrays in air are measured in	grays
The number of xrays in the useful beam define xray	quanitity, exposure, intensity
Xray quantity increases in direct proportion to increases in	mAs
If SID is reduced by one half the intensity of the image intensity increases	4 times
If filter thickness is increased then xray intensity is	reduced
If filter thickness is decreased then xray intensity is	increased
Which has the greater effect on increasing density, a 10% increase in kVp or a 10% increase in mAs?	kVp
If xray quantity is doubled, the optical density on the finished radiograph will be increased by a factor of	doubled
A change from 200 mAs to 400 mAs will cause intensity to ___ and optical density to ___	double; double
An increase of 15% in kVp is equivalent to increasing mAs	100%
The penetrability of an xray beam is called xray	quality
An xray that could pass through thick tissue would have high	penetrability and quality
Beam quality is affected by	kVp and filtration
Image contrast is affected by beam	quality and kVp
Xray beam quality is increased by increasing	filtration
A compensating filter is used to create	uniform optical density
The two primary forms of xray interaction in diagnostic range are	Compton scattering and photoelectric absorption
An xray interacts with an atom without ionization during	coherent interaction
An outer shell electron is ejected and the atom ionized during	Compton interation
Photoelectric absorption involves the ejection of	K shell electrons
Compton scatter is directed at ___ angle from the incident beam	any
There is compete absorption of the incident xray photon on	photoelectric interaction
Only at energies above 10MeV can	photodisintegration take place
K shell binding energy increases with increasing	atomic number
Bone has greater mass density than	fat, soft tissue, or air
Because of differential absorption about __% of incident beam contributes to the image	.5
Differential absorption depends on the	kVp of exposure, atomic number of absorber, and mass density of absorber
Attenuation is caused by	absorption and scatter
Barium is a good contrast agent because of its	high atomic number
A negative contrast agent is	air
____ kVp techniques reduce patient dose	high
If 5% of the incident beam are not attenuated then 95% were	absorbed or scattered
A high quality radiograph should always demonstrate	structures and tissues
Spatial resolution improves with decreased	screen, motion, and geometric blur
The ability to image two separate objects and visually detect one from the other is called	resolution
High speed IR generally produce images with	increased noise
The slope of the straight line portion of the characteristic curve shows the film	contrast
A transmission of 10% incident light corresponds to an optical density of	1
An IR with wide latitude can be used over a great range of	exposures
The three primary geometric factors affecting quality are	magnification, distortion, and focal spot blur
Way to minimize magnification	long SID and small OID
Focal spot blur can be reduced by using a	small focal spot, long SID, and small OID
Subject contrast is affected by	patient thickness, atomic number, density, and kVp selection
The chest has high subject contrast because of the wide differences in ____ and ____ tissue mass density between air and bone.	atomic number; greatest
Radiographic image quality is improved when source image distance is	increased
The primary control of radiographic contrast is by varying	kVp
Optical density is primarily controlled by	changing mAs
Image forming xray are those which have been transmitted without	interaction or absorbed or scattered through compton interaction
The % of Compton interaction increases as kVp	increases
Approximately ___ % of incident beam is transmitted through the patient.	0-9
Compton scatter contributes only to image	noise
Decreasing kVp will _____ patient dose	increase
Photoelectric interaction increases when kVp is	decreased
Scatter radiation increase as field size	increase
The most common beam restricting device Is the	variable collimator
Compression devices will	increase contrast
The use of collimation	improves contrast and reduces patient dose
Beam restriction with an aperture diaphragm is only accurate at a	fixed distance
You can improve image contrast with heavy patients without increasing patient dose by using	tight collimation

Created by: 10153696170312934

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