Diagnostic radiology systems are used for evaluation, by means of static or dynamic radiologic images, both of normal anatomy and physiology and of alterations of normal tissue resulting from disease or injury. The great majority of these images are the result of passing a localized beam of X-rays through the part of the body being examined, producing a static image on film. The image, called a radiograph, or X-ray picture, can take several forms within diagnostic radiology systems. It may be: a plain radiograph, such as the common chest X-ray; a tomograph (Greek, tomes,"section"), which is a radiograph obtained by timing the X-ray exposure to coincide with simultaneous movement of the X-ray tube and film in opposite or irregular directions around a predetermined plane in the body; or, finally, a computerized axial tomography (CAT or CT) scan, the computer analysis of a sharply limited, thin X-ray beam passed circumferentially through an area of the body, producing a cross-sectional image. Distinctive feature of the diagnostic radiology systems is not simply the set of the complex and high-quality equipment, but also the harmonious system of devices, mobile magnetic resonance imaging, technologies, and experts. Magnetic Resonance Imaging (MRI), diagnostic medical imaging technique utilizing the principles of nuclear magnetic resonance. Although magnetic resonance images have been produced for over two decades, the basic research in this field was conducted in the 1930s and 1940s and included fundamental investigations by physicists into the interaction of atomic nuclei with magnetic fields.The casual observer may be overwhelmed by the multitude of medical imaging techniques and applications available using magnetic resonance imaging. MRI is viewed by many as the most versatile, powerful, and sensitive diagnostic imaging modality available. Its medical importance can be summarized briefly as having the ability to non-invasively generate thin section, functional images of any part of the body at any angle and direction in a relatively short period of time. In addition, later techniques have allowed visualization of the heart with exquisite anatomical detail at any angle and direction using the technique of electrocardiographic gating. Other advances in MRI allow the visualization of arteries and veins using the technique called magnetic resonance angiography. Furthermore, spectroscopic mobile magnetic resonance imaging allows maps of biochemical compounds corresponding to any anatomical slice of the human body. This produces exceedingly powerful basic biomedical and anatomical information with tremendous potential for diagnostic radiology systems, for fundamental new knowledge and early diagnosis of multiple diseases. The Association of medical physicists, working on scientific and technical programs of Ministry of Atomic Energy and Ministry of Health and uniting leading experts, possesses corresponding know how, qualification and experience in diagnostic radiology systems. The radiological center there is equipped with the complex of the modern radiological diagnostic equipment, a complex of the radiating therapeutic equipment, a complex of the equipment for prebeam preparations and dosimetric planning; a complex of equipment for radiating measurements and clinical dosimetry and a complex of the equipment for physical updating beam therapy and increase of its efficiency.