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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Radiation doses to critical organs in the rest of the human body are compared. The treatment unit has been in lekselo use since September, The manufacturer’s specification required initial output to be more than 3.

A simple scoring ratio to index the conformity of radiosurgical treatment plans. This results in significantly lower extra cranial radiation to the patient compared to the earlier models U, B, C and 4C. Background corrections were applied to all films.

Gamma angles 72, 90,for APS for patient’s head fixation. These qualities enable treatment of larger target volumes, especially close to eloquent areas. The diode test tool yielded results for radial deviation of the central diode position that were well within the manufacturers recommended values. Twenty-one patients underwent radiosurgical treatment of multiple brain metastases using median 9 isocenters on LGK PFX. E Sector position which defines a 16 mm collimator. Sector transition dose was measured to be 0.

This results from the enhanced ability to shape isodose volumes, even for single isocenters. Coincidence of mechanical and dosimetric isocenter was established by using a special phantom which has a small needle located exactly at the geometric isocenter and can hold EBT films in the central position.

It is the delivery of a single, high dose of irradiation to a small and critically located intra-cranial volume through the intact skull. American Association of Physicists in Medicine.


Each GammaKnife contains about Co radioactive sources that are used to non-invasively deliver a high dose of radiation to treat brain disorders. A simple dose gradient measurement tool to complement the conformity index. These patients would have been treated using three shots median 8 on LGK 4C.

Individual treatment Equally high accuracy and ease of use for frame-based or frameless treatments, and for single or multiple targets. The Full-Width-at-Half-Maximum FWHM were obtained from measured beam profiles and compared with manfacture values stored in the treatment planning system.


Evidence-based performance Clinically proven, extensively published and expertly supported technology. Measurements of ROFs were repeated five times for each of collimator. Series of 28 Cases. Most of these tests also become part of routine daily, monthly or annual quality assurance tests. Most users should sign in with their email address. The goals of this paper oeksell manifold: Introduction Features Clinical confidence Outstanding performance Lekksell out with the best See the evidence.

Nil Conflict of Interest: Physics of Gamma Knife approach on convergent beams perfexin stereotactic radiosurgery. Every feature reflects patient and staff safety and comfort. The sector movement is performed by servo-controlled motors with linear scales located at the rear of the radiation unit. The docking of the patient into the PPS is done by means of a frame adapter that attaches to the standard stereotactic Leksell G frame with the help of three clips.

Performance-related features in the design of lsksell new radiosurgical system are described, and the ability to create complex shapes of isodose volumes even leeksell a single isocenter is demonstrated.

Radiation Therapy Oncology Group: Radiosurgery with the world’s first fully robotized Leksell Gamma Knife Perfexion in clinical knie From Simple Decompression to Sling Transposition. No other non-invasive treatment method in this field has greater clinical acceptance.


In addition to the diode measurements, film method was also used. The collimator arrangement and the patient positioning system also allow shorter patient transit times, reducing unwanted radiation exposure during movement between isocenters.

Plenum Publishing Corporation; This arrangement of sources differs substantially from the previous hemispherical arrangements of 60 Co sources in the U, B, C and 4C units and results in different source-to-focus distance for each ring varying from mm to mm. In order to remove this flaw, Paddick suggested an alternate quantity, known as PCI, with the following expression.

Paddick suggested that the definition of CI as given in Eqn. This diode detector can scan X, Y, Z profiles for 4, 8 or 16 mm collimators and dosimetric center for each axis can be calculated percexion the three measured profiles.

The Leksell Gamma Knife Perfexion and comparisons with its predecessors.

Deviations between measured and calculated values are given in parenthesis. Please see elongated shape of these three shots and blocking pattern of sectors. First clinical experience with the automatic positioning system and Leksell gamma knife model C, Technical note.

Congress of Neurological Surgeons members Sign in via society site. Future-safe technology Well-defined upgrade paths and proactive support through Elekta Care service. 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. Today, cranial radiosurgery with Perfexion is performed in hundreds of perfeixon hospitals and clinics around the world.