isocenter


Also found in: Medical, Wikipedia.

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 ?
Plan quality and treatment planning for single isocenter cranial radiosurgery with volumetric modulated arc therapy.
Elekta VMAT (Volumetric intensity Modulated Arc Therapy) overcomes these limitations and has the unique ability to use single or multiple gantry arcs that sweep non-stop over the target isocenter, while simultaneously controlling gantry speed, multileaf collimator leaves, dose rate and collimator angle.
Perfexion is an ideal system to treat metastases - particularly for patients with multiple lesions, as the system's advanced collimator facilitates rapid isocenter changes.
AlignRT([R]) for the HioArt platform will consist of two ceiling-mounted 3D camera units, each focused toward the external isocenter of the radiotherapy device.
Additionally, with Ziehm Imaging's implementation of intelligent virtual mechanics (IVM) technology, the isocenter can be chosen freely.
The relationship with Washington University School of Medicine has helped Philips Medical Systems develop cutting-edge technologies such as Philips exclusive Tumor LOC, a localization option that allows physicians to more quickly determine tumor isocenter and boundaries while the patient is present.
Once set-up is complete, the system is able to identify the tracker in 'real time' by using a high resolution optical camera and reference its position to the treatment machine's isocenter.
Critical data points are measured continually as a treatment progresses, ensuring that the system maintains a "true isocenter," or focal point of treatment.
Furthermore, because the system can be positioned in the isocenter of the magnet, it is ideal for high-quality orthopedic imaging.
The maximum dose delivery rate has been increased from 600 to 1000 monitor units (MU) per minute, and the machine's isocenter, or focal point, has been reduced to encompass a one millimeter diameter sphere.
I have been astonished and excited to see the degree to which the image isocenter matches the beam isocenter, at a level of precision I have never seen before.
We made the Trilogy system capable of delivering stereotactic radiosurgery by increasing its maximum dose delivery rate from 600 to 1000 monitor units (MU) per minute and by fine tuning the Clinac isocenter, or focal point, to a 1 millimeter diameter sphere," said Richard Stark, director of Varian's Delivery Systems product group.