Mammography exams require an image resolution far above most general radiographic exams. Mammography machines must have a resolution below 200µm to accurately detect micro-calcification. This means that an x-ray tube with a target spot of 0.1 to 0.6mm must be used. Additionally, this means that the resolution of any detector for mammography must be greater than 10 lp/mm. The latest flat panel detectors for mammography have resolutions around 20lp/mm. Due to the expected frequency of x-ray mammography exams and x-ray exposure levels to women, many countries are currently considering legislation to reduced the allowed x-ray exposure for breast exams.
Patient exposure is a problem for mammography DR. As resolution rises, the x-ray exposure you need to get a clear image rises. In mammography detector design, everything must be carefully considered to deliver the greatest possible x-ray signal without increasing the patient’s exposure.
With increases of breast cancer, international organizations have started to increase interest in the root causes and how to screen and prevent early. The focus is how to find it fast at stage of cancer origin and how to significantly reduce the dose.
Most countries are now under consideration for revising the law which regulates x-ray dose. Most radiologists look especially for the micro-calcification inside of breasts relating to the early detection of malignance. It is statistically checked that the tumors associated with breast cancer start from the abnormalities less than 200µm. Radiologists require x-ray systems to provide high resolution images to detect the tiny lesions. The would like most x-ray system manufacturers to take care of decreasing dose in the stage of design.