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As a medical specialty, radiology can be classified into two subfields. Diagnostic radiology is concerned with the use of various imaging modalities to aid in the diagnosis of disease. Interventional radiology uses these imaging modalities to guide minimally invasive surgical procedures.
Radiation therapy uses radiation to treat diseases such as cancer. While originally encompassed within radiology, therapeutic radiology -- or, as it is now called, radiation oncology -- is now a separate field.Commonly used imaging modalities include plain radiography, computed tomography ( CT), magnetic resonance imaging ( MRI), ultrasoundUltrasound is sound with a frequency greater than the upper limit of human hearing, approximately 20 kilohertz. Some animals, such as dogs, dolphins, and bats, have an upper limit that is greater than that of the human ear and thus can hear ultrasound., and nuclear imaging techniquesNuclear medicine also known as radionuclide imaging, nuclear scintigraphy or simply "Nuc Med" and abbreviated to "NM", is a radiological modality primarily used diagnostically to investigate physiological function. Nuclear medicine has applications in neu. These techniques are usually non-invasiveThe term non-invasive in Medicine has two meanings: A medical procedure which does not penetrates or breaks the skin or a body cavity, i. it doesn't require an ( invasive) incision into the body or the removal of biological tissue. An abnormal tissue grow. Each of these modalities has strengths and limitations which dictate its use in diagnosis.