isocenter


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isocenter

[′ī·sō‚sen·tər]
(graphic arts)
The unique point common to the principal plane of a tilted photograph and the plane of an assumed truly vertical photograph taken from the same camera station and having an equal principal distance.

isocenter

isocenter
The points on a photograph intersected by the bisector of the angle between the plumb line and the photograph perpendicular (i.e., where the principal axis meets the positive or negative plane). On a vertical photograph, the isocenter and photonadir point coincide with the principal point.
References in periodicals archive ?
Together with Mevion's 6D robotic treatment couch, it enables detailed imaging of the tumor and organs at risk with the patient positioned at the treatment isocenter.
IMRT plans were designed to a planned total prescription dose at the isocenter of 78 Gy in 39 fractions (66 Gy in 33 fractions to PTV1 with a boost of 12 Gy to PTV2).
Evaluation of Isocenter Reproducibility in Telemedicine of 3D-Radiotherapy Treatment Planning.
Then value of planning isocenter coordinate was altered in some direction to simulate inaccuracy of position of patients in actual treatment.
According to Ofix, the Encompass has been used for intracranial radiotherapy treatments for nearly a year and is now cleared to achieve sub-millimeter immobilisation to precisely treat multiple lesions with a single isocenter.
However, the use of any conductive materials in the vicinity of the scanner's isocenter must be limited because of the potential for induced eddy currents to locally deform the magnetic field homogeneity.
First, the patent should be positioned with the targeted region isocenter in the gantry.
For future tests, special structures should be designed for every used head coil to position the phantom accurately to the isocenter of the coil.
Another possibility is to physically mark the patient's new isocenter subsequent to the image-guided shifts on a daily basis.
You just verify at the isocenter with an image in IMRT.