Isocenter
Isocenter
The Isocenter (/ˈaɪsoʊˌsɛntər/; from Greek: ίσος, isos, "equal" and Latin: centrum, "center") is a term primarily used in the field of Radiology and Radiation Therapy. It refers to the point of convergence for the beams of radiation in three-dimensional space. This point is the center of rotation for the gantry, couch, and collimator of a linear accelerator.
Definition
In Radiation Therapy, the isocenter is the point in space where the beams of radiation intersect, regardless of the angle of the beam. This point is typically where the tumor or treatment area is located. The isocenter is crucial in ensuring that the radiation dose is accurately delivered to the target area while minimizing exposure to surrounding healthy tissues.
Usage
The concept of the isocenter is used in various medical imaging techniques such as Computed Tomography (CT), Magnetic Resonance Imaging (MRI), and Stereotactic Radiosurgery (SRS). In these techniques, the isocenter is the point around which the imaging device rotates, providing a three-dimensional view of the patient's body.
Related Terms
- Gantry: The part of a linear accelerator that rotates around the patient, directing the radiation beam towards the isocenter.
- Collimator: A device used in linear accelerators to shape the radiation beam and direct it towards the isocenter.
- Linear Accelerator: A device that generates high-energy x-rays or electrons for the treatment of cancer. The isocenter is a crucial component of this device.
Etymology
The term "isocenter" is derived from the Greek word "isos" meaning "equal" and the Latin word "centrum" meaning "center". This reflects the fact that the isocenter is the point where all beams of radiation meet, regardless of their angle of incidence.
External links
- Medical encyclopedia article on Isocenter
- Wikipedia's article - Isocenter
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