Question

What is x ray scattering?

How does scattering affect the contrast of the x ray image?

So how does scatteting affected by the x ray voltage and tube current?

What is the affect of tube voltage, current, target material and filtration on the x ray tube

Answer 1

X-ray scattering techniques are a family of nondestructive analytical techniques. Using these techniques, scientists obtain information about the crystal structure and chemical and physical properties of materials. Nowadays, different techniques are based on observing the scattered intensity of an X-ray beam hitting a sample as a function of incident and scattered angle, polarization, and wavelength.

Scattered X ray radiation leads to deterioration of image contrast, increases unsharpness and noise, and reduces background homogeneity. ... Thus, scattered X ray radiation exerts a significant effect on X ray imagequality, which makes the problem of suppression of scattered radiation quite important.

Tube voltage (kVp): adjusting the peak energy of the x-ray beam. Increasing kVp will change the contrast on an x-ray image. Increasing kVp will produce lower contrast.

Current (mAs): adjusting the amount of photons produced per unit of time. When all other factors are held constant, increasing mAs will produce a greater amount of photons that make up the x-ray image.

Changing kVp by 15% will have an affect similar to either doubling (kVp increase), or halving (kVp decrease) the mAs.

Target material (anode): Different materials (eg, Mo, Rh, W), with various atomic masses, are used as targets in x-ray generators. The higher the atomic mass, the greater the fluorescence of the target material. Depending on the application, the target material used is selected by the x-ray energy level requirements.

Adding a filter: Filters are used to attenuate the low-energy x-ray photons from the x-ray beam. These low-energy photons do not readily penetrate through the subject, thus increasing the absorbed dosage. The use of a filter improves the “quality” of the x-ray beam.