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Imaging Techniques

MSI). Electrical impedance imaging (EIT) looks at the electrical conductivity and resistivity of the body. Optical imaging techniques using infrared thermography are also now becoming more widespread, and T-rays may one day replace x-rays. Ultraviolet light is used in imaging fluorescence emitted by tagged molecules using the microscope. Except in cases where contrast media are used, such as in some x-ray, CT, PET and MRI scans, imaging techniques are generally non-invasive and carry minimal risk to the patient.

Digital Infrared Thermal Imaging (DITI) is a non-invasive technique for medical imaging which allows the visualization and quantification of changes in the temperature of the skin surface (Meditherm, 2002). It has been used extensively in the United States, Europe and Asia for the last 20 years. DITI has the unique capability to show physiological changes and metabolic processes, and is a useful complementary procedure to such conventional procedures as x-rays, CT scans and MRIs. DITI is an objective test that graphically displays the changes in skin temperature which accompany pain states. It can show the combined effects of the autonomic nervous system and the vascular system, down to capillary dysfunction.

In DITI, an infrared scanning device is used to produce a thermogram that graphically maps the temperature of the body. The scanner converts infrared radiation emitted from the surface of the skin into electrical impulses which can be visualized on a color monitor. The spectrum of colors produced indicates increases and decreases in radiation emitted from the bodyÆs surface and since there is a high degree of thermal symmetry in the normal body, abnormal temperature symmetry is readily detectable.

Skin blood flow is under sympathetic nervous system control and neurothermography measures the somatic component of the sympathetic nervous system by assessing dermal blood flow. The somatic sympathe...

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Imaging Techniques. (1969, December 31). In LotsofEssays.com. Retrieved 01:16, March 29, 2024, from https://www.lotsofessays.com/viewpaper/1713327.html