Create an account
Beam Limiting Device (BLD)
It's purpose is to limit the size of the beam and area of exposure to patient, thereby reducing the harmful effects of scatter and to improve image contrast.
1.) Aperture Diaphragm
2.) Cones and Cylinders
3.) Variable Aperature Collimator
What are the types of beam limiting devices?
Lead or a Lead Lined Plate
In the aperture diaphragm there is ___ placed directly below the window of the x-ray tube.
The ___ of the aperture diaphragm is designed to just cover less than the size of the image receptor used.
NCRP guideline: Variable Aperture Collimator must be accurate to within ___% of the source-to-image distance.
Positive Beam Limiting (PBL) Device
Most variable aperture collimator are automatically adjusted when a film is inserted in a bucky, called a ___.
Positive Beam Limiting (PBL) Device are equipped with usually two or more ___ stacked one above the other.
Mirror and a Light Bulb
Positive Beam Limiting (PBL) Device uses a ___ as a guide for projection of the field know as a light localization apparatus.
Sheets of aluminum placed between the protective tube housing and external housing.
1.) Proper technique
2.) Proper positioning
3.) Appropriate marker
4.) Correct patient identification
Methods used to avoid repeated radiographs?
1.) Digestive organ motion
2.) Cardiac motion
3.) Muscle Spasms
Shorter exposure time is used for involuntary motion such as?
Radiographic examinations should be performed only during the first 10 days following the onset of the menstrual period.
To reduce the radiation exposure to the reproductive organs.
What is the purpose of patient shielding?
An effective means of reducing the risks of genetic defects for the whole population.
What is the importance of patient shielding?
1.) Flat contact
2.) Shadow shield
3.) Shaped contact shield
What are the types of shielding devices?
Patient shielding should be considered for all patients, especially children and those who are potentially ___.
Gonadal shielding should be used when the gonads lie in or within ___cm of a well-collimated field or the useful beam.
Positioning and Beam Collimation
Proper patient ____ should not be relaxed when gonad shields are in use.
Patient shielding should only be used when it does not ___ with obtaining the required diagnostic information.
2.) Hip (Except oblique)
3.) Upper femur
Shield males in what exams?
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together