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A contrast agent (or contrast medium) is a substance used to increase the contrast of structures or fluids within the body in medical imaging. [1] Contrast agents absorb or alter external electromagnetism or ultrasound , which is different from radiopharmaceuticals , which emit radiation themselves.
Contrast-enhanced ultrasound (CEUS) is the application of ultrasound contrast medium to traditional medical sonography. Ultrasound contrast agents rely on the different ways in which sound waves are reflected from interfaces between substances. This may be the surface of a small air bubble or a more complex structure.
The Molecular Imaging and Contrast Agent Database or MICAD is a freely accessible online source of information on in vivo molecular imaging agents. It was established as a key component of the "Molecular Libraries and Imaging" program of the NIH Roadmap, a set of major inter-agency initiatives accelerating medical research and the development of new, more specific therapies for a wide range of ...
A contrast medium for medical ultrasonography is a formulation of encapsulated gaseous microbubbles [64] to increase echogenicity of blood, discovered by Dr. Raymond Gramiak in 1968 [65] and named contrast-enhanced ultrasound. This contrast medical imaging modality is used throughout the world, [66] for echocardiography in particular in the ...
Iodinated contrast contains iodine.It is the main type of radiocontrast used for intravenous administration.Iodine has a particular advantage as a contrast agent for radiography because its innermost electron ("k-shell") binding energy is 33.2 keV, similar to the average energy of x-rays used in diagnostic radiography.
Contrast in ultrasound imaging relies on the difference in acoustic impedance, a function of both the speed of the ultrasound wave and the density of the tissues, [12] between tissues or regions of interest. [5] As the sound waves induced by ultrasound interact with a tissue interface, some of the waves are reflected back to the transducer.
An imaging agent may refer to: Contrast medium, which absorbs or alters external electromagnetism or ultrasound; Radiopharmaceutical, which emits radiation
Molecular imaging is a field of medical imaging that focuses on imaging molecules of medical interest within living patients. This is in contrast to conventional methods for obtaining molecular information from preserved tissue samples, such as histology .
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