Medicine radiology is a branch of medicine that uses different radiaton for the purpose of diagnostic and treatment. Radiology for its basic documents uses radiological image. Radiographic image is the basis for setting specific diagnosis in cardiology. To ensure that image is quality we need to know the factors that affect it. This work finds its base in the two most important factors when creating the image such as density and contrast. Density or radiological density is a measure of the degree of opacity on film. Density is basically determined by the exposure, apropose we learn that the mAs are primary in density control. For a visible change in the density we need to change the mAs for 30% of the nitial value. Although the mAs are primary density control it is important to point out that no amount of mAs will never compensate insufficient kilovolt. Kilovolt and mAs are not the only factors affecting the density, so for the best quality we have to pay attention to other factors affecting the density to create image(automatic exposure control, distance of source, object and image receptor, grilles, filters, collimation, anode effect.). Second factor that we decribed to create a radiological image is contrast. Contrast is defined as difference in density of the two adjacent tissue. Radilogical contrast in the first place depends on kilovolts. In order to get a quality contrast we use lower values kolivolts. Visible change in contrast we will not have until we change the initial value for 15%. The contrast of the subject is very important beacuse the anatomical structures must have its physics contrast that would be visible on the radiographic image. Beside the contrast of the object the radilogical contrast depends on the type of receptors on which the image remains recorded. We know that movis as the major limitation carries relatively little dynamic width versus phosphorous plates and direct digital methods. All images must undergo certain forms of treatment. When we talk about the processing of the film it is important to keep an eye on the chemical composition of the developer, time of developing and temperature because of them depends the image quality including the contrast. For each radiological procedure we are using an optimal energy of x-rays in order to produce an image with the best contrast in relation to the dose. Comparing CT and conventional X-ray device we see that CT device has better contrast resolution. This conclusion is not suprise for us because we know that CT can show difference in density up to 0.25%, while conventional X-ray can show difference in density up to 10%. In the end we can say that the density and contrast are two closely related factors that affect the quality of the radiological image, and also allow us better visibility of details.