August 18, 2019 posted by

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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Sign In or Create an Account. The concept of “dynamic shaping” of dose distribution is introduced as a means of decreasing the exposure to structures outside the target. Fully integrated system design — with no moving parts during delivery — ensures minimal downtime.

Design and performance characteristics of a Cone Beam CT system. 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.

Pefexion results from the enhanced ability to shape isodose volumes, even for single isocenters.

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. Icon is the only technology with microradiosurgery capabilities allowing for the treatment of virtually all disorders in the brain with ultrahigh precision.

IOP Publishing Ltd; The collimator arrangement and the patient positioning system also allow shorter patient transit times, reducing unwanted radiation exposure during movement between isocenters. Radiation doses to critical organs in the rest of the human body are compared. It is preferred for its extreme accuracy, efficiency and outstanding therapeutic response.

The most significant change seen in treatment planning is the ability to generate a single isocenter composed of different beam diameters.

Related articles in Google Scholar. Bristol – Adaptive fractionated treatment of Metastatic Oesophageal Carcinoma. D Sector position which defines a 8 mm collimator.


The Full-Width-at-Half-Maximum FWHM were obtained from measured beam profiles and compared with manfacture values stored in the treatment planning system. 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.

Leksell Gamma Knife® Perfexion™

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. Physics of Gamma Knife approach on convergent beams in stereotactic radiosurgery. Sign in via your Institution Sign in. The sector movement is performed by servo-controlled motors with linear scales located at the rear of the radiation unit. The result lnife improved image quality for better image guidance.

To purchase short term access, please sign in peksell your Oxford Academic account above.

The Icon system provides the precision and accuracy for which Gamma Knife has long been known while giving us the flexibility to deliver treatment in single or multiple sessions. This site uses cookies. The patient’s head can be locked in one of the three different gamma angles head rotations: Before exposing the films to radiation, the films were punched with a needle. Oxford University Press is a department of the University of Oxford.

Congress of Neurological Surgeons members Sign in via society site. Different sector colors indicate different collimator size used: Lower dose to healthy tissue times lower dose to healthy brain and lowest dose to rest of body compared to other SRS modalities 2 2 Ma L, Nichol A, Hossain S, et perfexiln.


The Perfexion exceeds the capabilities of previous gamma knife models in terms of treatment efficiency, conformity, and radiation protection.

The PPS provides a more comfortable position for the patient during treatment. An evaluation of the Model C gamma knife with automatic patient positioning. A patient can now be positioned on the treatment couch and then imaged without moving from one device to another. Plenum Publishing Corporation; Coincidence of mechanical and dosimetric isocenter was established by using a peerfexion phantom which has a small needle located exactly at the geometric isocenter and can hold EBT films in the central position.


Planned dose equals delivered dose with guaranteed system accuracy over lifetime of device 1. Dose plans for the Leksell Gamma Knife Models B, 4C, and Perfexion have been created for target pathologies to illustrate how the software and hardware of the new radiosurgical system can increase treatment quality, decrease treatment time, and increase patient comfort.

In addition to importing into MOSAIQ treatment plans and treatments records generated by Gamma Jnife, users can automate the billing and scheduling processes and save valuable time and resources.

A sector containing 24 sources can be moved into one of the five different positions: Sc February 6th, Results for measured X, Y, Z profiles for 4, 8 and 16 mm collimators are given in Table 4. The beam size for each region is changed automatically by prrfexion 24 sources over selected collimator set. Sector transition dose was measured to be 0. Paddick suggested that the definition of CI as given in Eqn.

Open in a separate window. Total treatment time on the LGK PFX even for patients with very complex treatments brain tumors never exceeded two hours. Accuracy of co-registration of planning images with Cone Beam CT images.

Gamma angles 72, 90,for APS for patient’s head fixation.

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

The automated collimator arrangement in the Perfexion makes it possible to produce more complex treatment volumes than with previous models of the gamma knife. The indices discussed in this appendix are useful tools to compare competing treatment plans for the same patient. This result was much better than manufacture required specification 0.