What is one of the benefits of using a higher kVp?
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 are the characteristics of a good radiograph?
DEFINITION • An Ideal Radiograph is one that provides a great deal of information, the image exhibits proper density and contrast, have sharp outlines and are of the same shape and size as the object being radiographed.
Why kVp is primary control for contrast?
The kVp controls both the quality and the quantity of the x-ray beam. As the kVp is increased, the energy of the photons in the beam is increased, changing its quality. The kVp is the primary controller of the penetration of x-rays.
What are the 2 major controlling factors of density?
Stack #132647
| Question | Answer |
|---|---|
| What is the controlling factor of density? | Mas |
| What factors secondarily influence density? | KVP, distance, beam restriction, anatomic part, grid, film/screen combination, processing, anode heel affect |
What happens to contrast when you increase kVp?
The more penetrating the radiation. The higher the kVp, the longer the scale of contrast on the film. Increasing the kVp increases the chances of more scatter or scatter radiation produced…. therefore it decreases Contrast.
Why mAs is the controlling factor for density?
mA is directly proportional to the intensity or quantity of the x-ray beam. This means that doubling the mA, doubles the number of x-rays and therefore doubles the density. mAs is called the total exposure because it controls the number of x-rays produced at exposure.
What is density in chest xray?
Densities in Chest X-Ray Basically, you can recognize air, water and bone density on chest x-ray. Lung fields appear dark because of air. Ninety-nine percent of the lung is air. The pulmonary vasculature, interstitium constitute 1% and give the lacy lung pattern. Heart, vessels, liver and diaphragm are liquid density.
What is the relationship between attenuation and contrast?
Objects with increased attenuation produce shadows. The image contrast produced by an object depends on its attenuation of the x-ray beam. Generally increased penetration through an object decreases contrast. In creased penetration through the total body generally decreases the radiation dose to the patient.