A medical specialty that is used in imaging is known as Radiology. The visualized diseases are diagnosed and treated with the help of the imaging.
A medical doctor who is specialized in diagnosing and treating diseases using imaging techniques is known as Radiologist, Radiographer or Radiologic technologist.
In the field of diagnostic radiology, Radiologists uses the following group of imaging technologies:
X-ray radiography – When x-rays are transmitted through a patient to a capture device, Radiographs are produced. Then radiographs are converted into an image for diagnosis. The common and unique imaging yields silver impregnated films.
Ultrasound – Ultrasound are high frequency sound waves. They are used to visualize soft tissue structures in the body. The quality of the ultrasound depends on the talent of ultrasonographer. Ionizing radiation is not involved in performing ultrasound. Ultrasound can’t image through air or bone. Ultrasound is used in medical ultrasonography.
Computed Tomography (CT) – X-rays are used in CT imaging in combination with computing algorithms to image the body. A ring shaped device revolves around a patient in which an X-ray generating tube opposite an X-ray detector is fitted. It produces a computer generated cross-sectional image (tomogram).
Nuclear medicine – Nuclear medicine uses radionuclides. It is a branch or specialty of medicine and medical imaging that relies on the process of radioactive decay in the diagnosis and treatment of disease.
Other elements are combined with elemental radionuclides to form chemical compounds, or else combined with existing pharmaceutical compounds, to form radiopharmaceuticals. These radiopharmaceuticals, once directed to the patient, can localize to specific organs or cellular receptors.
Positron Emission Tomography (PET) – It is a nuclear medicine imaging technique which produces three-dimensional image or picture of functional processes in the body. Biologically active molecule is introduced into the body through which the system senses pairs of gamma rays released indirectly by a positron-emitting radionuclide (tracer).
Magnetic Resonance Imaging (MRI) – Magnetic resonance imaging (MRI) is also known as nuclear magnetic resonance imaging (NMRI), or magnetic resonance tomography (MRT). It is used to visualize detailed internal structures. MRI uses the property of nuclear magnetic resonance (NMR) to image nuclei of atoms inside the body.