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MNPS results from a 22-year-development of stereotactic procedure planning techniques based on personal computers and neuroimages [1]. It began in 1990 with the name NSPS, and from 1994 to 2003 was distributed with the name of MSPS.

MNPS has versions for the following stereotactic apparatus: FiMe, Bramsys, Macom, Micromar, Leksell, CRW, ZD and Riechert-Mundinger.

All techniques are tridimensional (3D) and based on the parametrization of each tomographic, magnetic resonance and stereotactic angiography section plane.

In order to ease functional surgery procedure planning, two stereotactic atlases (Schaltenbrand-Wahren and Talairach) were digitalized to vectorial shape and various resources incorporated to achieve the maps overlay over reformatted stereo-tomographies slices. Many parameters guarantee control over the atlas space orientation in relation to the patient's brain, being the anterior and the posterior commissure essential to that.

In order to include magnetic resonance to the plan, lowering the impact of its geometric distortion, a multimode image fusion technique was created. This method considers stereo-tomography space as a rigid volume and allows a slight plasticity in resonance volume (with control over the módulo de rigidez). The algorythm is of 3D domain, semi-automatic, not being critical in case of superposition of partial volumes, and is stable when applied in images with artifacts and retrospective studies.

There are no principle limitations in mutual orientation of tomography and resonance cuts to be fused.[2] 

The incorporation of such methods raises the safety of procedures, lowers their invasion and reduces surgical time.
Another MNPS resource is the module for Radiosurgery planning.

The MNPS System can be configured for different models of Stereotaxis and Radiosurgery equipments

[1] - "A Stereotactic Surgical Planning System for the IBM 386/486 PC Family", A. Alaminos, I. Ortega, H. Molina, P. Valladares. Stereotac Funct Neurosurg 1994; 63.

[2] – "Desenvolvimento de uma técnica para fusão de imagens como complemento ao planejamento cirúrgico em condições estereotáxicas", Armando Lázaro Alaminos Bouza, Tesis presentada a la Universidade Federal de São Paulo – Escola Paulista de Medicina – para la obtención del título de Master en Neurociencias. 1999.

 Evolution of the System

Version History
Version 10.33.04
•   Z-bar support can be defined for every planned trajectory, so that you can have different Z-bar positions simultaneously on the same plan.
•   When closing the fusion mode with F5, MNPS jumps to the closest point to the active cursor in a stereotactic axial image.
•   MNPShell now asks if the DICOM image set is for “Stereotactic”, “Virtual Fiducials Mode” or “Non Stereotactic”. If you select the Virtual Fiducials, MNPS will create a new plan with Virtual Fiducials.
•   “Virtual Fiducial Mode” extended to Radionics CRW system.
•   “Virtual Fiducial Mode” can handle MRI sequences of sagittal and coronal images after the definition of AC, PC and IHP. Previous version of MNPS was not able to handle non-axial image sets.
•   MNPS now imports POIs from the external set, as well as ROIs. Only POIs with different names are imported to avoid overwriting.
•   When a functional atlas is being shown on the main window, the nucleus where the cursor lays is reported on the windows caption.
•   Move the cursor to a point corresponding with specific commissural coordinates entered manually (keyboard). Activate this option with CTRL-X or via <F1> (help menu). Before this option is use, make sure that AC, PC, and IHP are defined. The cursor goes to the closest pixel with the desired commissural coordinates over an axial plane parallel to AC-PC.
•   Added support for Adeor Zeppelin stereotactic apparatus.
•   For “Clean Image”, the retouch now accepts the use of mouse. “Clean Image” is mandatory for Radiosurgery planning.
•   Increased maximum depth of dose representation for radiosurgery beams (was 280mm, now is 320mm).
•   Faster and safer search for control points inside PTV and OHT for Radiosurgery optimization.
•   Improved automatic fiducials recognition for the ZD frame when the frame is tilted inside the CT gantry.
•   Increased vertical resolution for the internal density cube.
•   Bug removed that crashed MNPS when the user clicked at the lower right border of the main window.
•   Better control of gray window on fusion mode.