Experts around the world – including NJ, NYC and the rest of the Tristate area – are choosing the Leksell Gamma Knife Icon system to treat. OBJECTIVE: The objective of this study is to introduce a new radiosurgical device , the Leksell Gamma Knife Perfexion (Elekta Instruments AB, Stockholm. A new model of Leksell Gamma Knife® (LGK), known as Perfexion™ (LGK PFX), was introduced by Elekta Instrument, AB, Sweden, in This model has a.

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Iso-dose plans were generated for the same doses as were prescribed for treatment.

This results from the enhanced ability to shape isodose volumes, even for single isocenters. By continuing to browse the site you are agreeing to our use of cookies. Sunnybrook Health Sciences Centre- A distributed and efficient method to treat multiple mets.

Background corrections were applied to all films. Equally high accuracy and ease of use for frame-based or frameless treatments, and for single or multiple targets. In PPS, instead of moving only the patient’s head, the whole body of the patient lying on the PPS is moved into the pre-selected stereotactic coordinates.

Radiation doses to critical organs in the rest of the human body are compared.

C Sector position which defines a 4 mm collimator. Gamma angles 72, 90,for APS for patient’s head fixation. Leksell Gamma Knife Icon is the most precise radiosurgery device on the market, limiting radiation dose to healthy tissue.

First year experience with newly developed Leksell Gamma Knife® Perfexion™

Radiosurgery with the world’s first fully robotized Leksell Gamma Knife Perfexion in clinical use: The Perfexion exceeds the capabilities of previous gamma knife models in terms of treatment efficiency, conformity, and radiation protection. The gradient index GI provides a measure of spread of low dose outside TV into the surrounding healthy tissue.


The radically new design of LGK PFX has had a great impact on the treatment planning software and the treatment planning. By continuing to browse the site you are agreeing to our use of cookies.

On line CBCT imaging will reveal any discrepancy in patient positioning, providing guidance to correct any errors and ensure the treatment accuracy without using the invasive head frame. The LGK PFX demonstrated a high level efficiency in workflow thus reducing significantly the total treatment time especially for the treatment of multiple metastases.

Fully gamka treatment delivery ganma for small teams and high throughput regardless of treatment gamm. It furthers the University’s objective of excellence in research, scholarship, and education pdrfexion publishing worldwide. No other non-invasive treatment method in this field has greater clinical acceptance. The 4 and 8 mm collimator sizes are kept the same as for the previous models, but the 14 and 18 mm collimator sizes of the previous models are replaced with a 16 mm collimator size.

Relative output factor for 16 mm collimator size is by definition 1. The new design features of the system offer many dosimetric capabilities to create highly conformal treatment plans. The gamma perfwxion is the only treatment parameter that requires manual set up.

The PPS provides a more comfortable position for the patient during treatment. In order to remove this flaw, Paddick suggested an alternate quantity, known as PCI, with the following expression.

Footnotes Source of Support: Results of these measurements can then be compared with reference values stored in the system. Coincidence of radiological focal point with PPS mechanical isocenter measured by film.

The Leksell Gamma Knife Perfexion and comparisons with its predecessors. These qualities enable treatment of larger target volumes, especially close to eloquent areas.

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The beam perfexioh for each region is changed automatically by moving 24 sources over selected collimator set. The unit has worked remarkable well with zero down time. A systematic approach was undertaken to perform acceptance testing, commissioning, and detailed measurement of various dosimetric characteristics of the system.

By continuing to browse the site you are agreeing to our use of cookies. Impact of the model C and Automatic Positioning System on gamma knife radiosurgery: Keeping a high score of PCI indicates good conformity of a treatment plan and keeping a low value of GI indicates low dose to the surrounding tissue.


PPS radial precision test with two diodes in offset positions. The collimator arrangement and the patient positioning system also allow shorter patient transit times, reducing unwanted radiation exposure during movement between isocenters. It is preferred for its extreme accuracy, efficiency and outstanding therapeutic response. These tests are summarized in Table 2 together with tolerances as recommended by the manufacturer and adapted by the authors. IOP Publishing Ltd; Today, Gamma Knife surgery is performed in hundreds of leading hospitals and clinics around the world.

The automated collimator arrangement in the Perfexion makes it possible to produce more complex treatment volumes than with previous models of the gamma knife. Design and performance characteristics of a Cone Beam CT system. Accuracy of coincidence of radiological focal point and PPS mechanical isocenter was verified for the 4 mm collimator using the film technique described in the Materials and Methods section.