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Manual technique charts are based on patient part measurements obtained using an x-ray caliper
thickness, in centimeters
The kVp that is sufficient to penetrate the body part adequately without excess exposure to the patient is called
The advantage of using a variable kVp technique chart are
Lower overall image contrast. Improved visibility of detail. ability to make small incremental changes in exposure technique.
How should a exposure factors be adjusted when there is the likelihood of motion?
increase mA , decrease exposure time
A satisfactory radiograph is made using 5 mAs with an image receptor relative speed (RS) of 400. How many mAs would be necessary to produce a radiographih of similar density if an RS 100 screen is used?
Which mA station can be used for the most average size patients to take advantage of the small focal spot?
If 10 mAs produces satisfactory results with a 5:1 ratio grid, what mAs would be needed if a 16:1 ratio grid is used?
What x-ray projections can benefit from the use of compensating filters?
Ateroposterior (AP) thoracic spine
Indicates the need for increased techniue
Indicates a decrease technique
Chronic obstructive pulmonary disease (COPD)
Which tool and which unit is used to measure body part thickness for radiography?
caliper - centimeters
Record detail - image clarity affected by
focal spot size
intensifying screen and film speed
devices that can be placed between the radiographic tube and IR to compensate for variations in tissue density. (attenuating devices)
Fixed kVp chart
optimum KvP vaule is established for each projection and the mAs is varied according to the patient/part thickness
A listing of varies radiograp[hic examinations performed in the facility. It provides exposure factors for each body part according to its thickness.
variable kVp chart
Chart based on a specific mAs vaule for each projection and to vary the kVp by 2 to 3 kVp/cm for changes in the patient/part size.
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