General Introduction

Professor and neurosurgeon, Lars Leskell of the Karolinska Institute in Stockholm, Sweden, first recognized the need for an instrument to target deep-seated intracranial structures without the risks of invasive open skull surgery in the late 1940s, and introduced the concept of stereotactic radiosurgery. After 20 years of further research, he developed the first functional Gamma Knife along with Professor Borge Larsson, and the Elekta Company in 1968.

Through advanced imaging, and three-dimensional planning techniques, gamma knife radiosurgery delivers multiple, very narrow beams of gamma radiation to small targets inside the brain. It sends radiation beams through holes in a device called the collimator helmet. Only at the point where all the gamma beams converge at a single, finely focused point is enough radiation delivered to treat the diseased tissue while the surrounding healthy tissue is left unharmed.

In August 1999, MASEP developed the rotary gamma system in China. The rotary gamma system uses 25 Cobalt sources distributed in a spiral mode, and rotates with collimator to precisely target a selected lesion. The rotary gamma system features the precision focusing of the Leskell gamma knife, yet allows for dynamic gamma beams, instead of the static beams provided by the non-rotational Leskell design. The advantage is obvious.
It delivers the same dose rate at the focal point while reducing the number of radioactive sources. This technique provides less harm to healthy tissues. The focal point is sharp and crystal clear.

A variety of indications including AVM, benign and malignant tumors, and functional diseases can be treated
with Gamma radiosurgery. Many previously untreatable conditions are now treatable. There is minimal risk of  of post-treatment complications, plus a high cure rate. In addition, the procedure is painless, and patients can return to their regular daily schedules within a couple of days. The gamma system uses 25  Cobalt-60 sources distributed on the surface of a hemispherical shell in spiral mode.  Passing through collimators, gamma rays are precisely converged in the center of the sphere forming the focus. During treatment, the stereotactic system aligns the selected lesion with the focus. The rotary gamma system retains the precision focusing design in similar device while greatly enhancing the focal quality as a result of rotary concept.

In similar Gamma Knife, each gamma beam is static.  MASEP focusing is dynamic and rotating in 360 degrees. However, both static and dynamic focusing deliver the same amount of radiation to destroy intracranial lesions.  At the same time, the radiation of gamma rays to surrounding healthy tissues is small so that the damage to surrounding healthy tissues is minimized.
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