What is an advantage of the variable kVp technique chart?
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What is an advantage of the variable kVp technique chart?
One of the advantages of a variable kVp chart is that overall image contrast is higher, which may provide greater visibility of detail.
What is a fixed kVp system?
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.
Why is a technique chart important?
A technique chart provides a consistent method of choosing the proper radiograph settings without having to calculate all of the components by hand with each exposure. Taking the time to prepare a technique chart in the beginning will help to save time, money, and radiation exposure to both the patient and staff.
What is the purpose of radiographic technique chart?
Technique charts are developed to list average kVp, mA, time, distance, and film type used for various exams. Essentially it is a reference to aid the radiologic technologist in producing an optimal image on the first exposure, rather than taking a film that is too dark, too light, or under/over penetrated.
What is are the advantages of using high Kilovoltage technique?
One advantage of using high kV technique is shorter exposure time [1]. The higher the energy, the more photons will penetrate the body, the less that are absorbed. Although this reduces patient dose, image quality is compromised due to reduced contrast of a preferentially forward scattered radiation [2], [3].
What is the primary variable in a fixed kVp radiographic exposure technique system?
Primary Factors. The primary exposure technique factors the radiographer selects on the control panel are milliamperage, time of exposure, and kilovoltage peak (kVp).
What are the factors that influence a technique chart?
What factors can influence a technique chart? Speed of screens, age of screens, speed of film, source-image distance (SID), amount of beam filtration, temperature and time of film processing and type of grid.
What is variable kVp?
Variable kVp Advantages. -allows for small changes in exposure for small changes in part thickness. -higher contrast. Variable kVp Disadvantages. -more pt dose.