Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Radiographic Density

Ch 28

_______ is the degree of overall blackening of the film. (photographic property that comprise visibility of detail) Density
______ is the concept of density as it is displayed on a soft-copy monitor for digital images. brightness
________ describes the digital processing that produces changes in density/brightness. Window level
What range of OD is visible to the human eye? OD 0.25-2.50
What is the major consideration in assessing density verification? That proper densities are visible throughout the anatomical area of interest on the image.
The ____ image has received too many photons and has recorded too much information. overexposed
If any image is overexposed, the ________can be adjusted to fix the density of the image. window level
Whenever a choice must be made between excess and insufficient density, the best decision is always the choice that will produce the ________ image. overexposed
If exposure conditions push into the toe or shoulder regions of the curve, dramatic _____________ changes can be seen. film density
_______ is the controlling factor of density. mAs
______ is the influencing factor of density kVp
mAs should be used as a principle method for adjusting for _______ or _______ density. insufficient/excessive
_______is determined by the characteristics of the IR. density
_______ is the ability of the film to stop light. Opacity
If a region of a radiograph has an OD of 1.0 only _______ of the incident light is transmitted through the radiograph in that region. 10% or 1/10
The straight line portion of the D lo E curve, film density is _________ to the log relative exposure. approximately proportional
Will doubling the exposure result in a doubling the film density? NO
Image density/brightness on the display monitor is controlled by ___________. window leveling
Setting the correct ____ is still critical in determining the proper digital image receptor exposure. mAs
Digital image histograms are ____________ of the exposure to the IR. graphic representations
As mAs increases, ________ increases proportionally and ________ also increases. exposure/film density
The reciprocity law fails for __________ or _________ exposure times. extremely short or long
If the mAs used to create one image is the same as the mAs used to create a second image of the same structure, then both images should have the same __________. film density
The minimum change necessary to cause a visible shift in film density is ______ of mAs or any other influencing factors that would equal this change. 30%
_______ is mainly controlled by the radiographer, but can also be preset with a computerized exposure system. mAs
A _______ or _________ can eliminate the excess information and reveal details within the range of human visual ability. bright light/scanner
The general rule of thumb for mAs changes is to make adjustments in increments of ______ or ______. doubles/halves
Kilovoltage has a __________ effect on density. profound
Kilovoltage contols the average ____ of the x-ray photon produced at the anode target. energy
The 15% rule is used as a guide to maintain the same image receptor exposure film density when _______ changes. kilovoltage
The 15% rule will always change the ______ of the image. contrast
A radiograph of the elbow is produced using 4 mAs at 60 kVp. What kVp would be required to halve the exposure to the IR. 51 kVp
The 15% rule may vary from a 15% rule to a _____% rule. 25
Motion has what impact on density? none
What is grid ratio? 16:1 and 8:1; amount of lead strips in a grid
An increase in pt size will ______ density and a decrease in pt size will _____ density. decrease; increase
Increase in field size will ____ density. increase
An increase lead in the grid will ____ density. decrease
An increase in screen speed will ____ density.(more efficient) increase
What kind of relationship is distance to density? an inverse relationship (inverse square law)
A decrease in OID will result in an increase in density: this is an example of a _______. inverse relationship
Increased generator will result in an ______ density. (high field, more efficient) increase
A radiograph of the chest with pneumothorax will result in a a radiograph with more ______. density
Pulmonary edema would show on a radiograph with ______ density. Less
The two photographic factors that allow detail to be seen are ______ and ______. density/contrast
As developer solution temperature increases, film density will _______. increase
If a satisfactory exposure is obtained with 20 mAs at 72", what mAs will be required to maintain the same exposure at 40"? 6.2 mAs
If a satisfactory PA chest radiograph is made at 72" with 4 mAs, what mAs, will be required at 56"? 2.5 mAs
A radiograph of the elbow is produced using a 4 mAs at 60 kVp. What kVp would be required to halve the exposure to the IR? 51 kVp
___________ affects kVp's affect on density. generator efficiency
Thicker anatomical parts should be placed on the _____ side and smaller anatomical parts should be placed on the _____ side. cathode/anode
______ charged electrons cause a blooming effect. negatively
If a radiograph using 40 mAs (400mA at 0.10 sec.) produced a radiograph with satisfactory density, what new time should be used at 200 mA? 40 mAs/200mA = .20 sec
A radiograph of the forearm is produced using 4 mAs at 55kVp. What kVp would be required to double the exposure? 63 kVp (55 kVp + 8.25 kVp =63 kVp (63.25 kVp.)
An x-ray exposure of 240 mR is recorded at a distance of 20 inches. If the same technical factors are used, what will the exposure be if the distance is increased to 40 inches? mAs2=60
If a satisfactory density is obtained with 40 mAs at 72 in., what mAs is required to maintain the same density at 40 in.? mAs2=12
What is the proper mAs for use with an 80 RS system when technical factors of 55 kVp and 5 mAs produce an acceptable image with a 200 RS system? 12.5 mAs
An increase in patient size will ___________ density. A decrease in patient size will _______ density. decrease; increase
An increase in beam restriction will ________ density. decrease