Glossary

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ICD-9

International Classification of Diseases - 9th Edition. A statistical classification system that arranges diseases & injuries into groups according to established criteria. Diagnosis codes used for billing.

ICD9

See ICD-9i

IGRT

Image Guidance Radiation treatment (stereoscopic x-ray guidance) for localization of target volume for the delivery of radiation therapy.

Immobilization Device

Any type of restraining device that will conform to the patient's body contour to prevent motion during the treatment delivery phase, such as alpha cradle or aquaplast mask.

IMRT

Intensity Modulated Radiation Therapy. A method of very precisely delivering a high dose of radiation to a target area while protecting nearby sensitive structures.

Interstitial

The placement of needles through the skin or mucus membranes directly into tissues. Usually serving as the carrier for hyperthermia or radioactive sources.

Intracavitary

The placement of a hollow probe or other instrument directly into a body cavity, usually serving as the carrier for hyperthermia or radioactive sources.

Irradiate

To treat with radiation.

Isocenter

The center of the treatment area related to the isodose lines.

Isodose Line

A line or series of lines, following the paths of the same dosage distributed from external beams of radiation or surrounding a radioactive source.