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Specifications

MNPS

Features

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.

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 Evolution of the System

Version History
Version 10.36.05
•  New: Support for DBS systems manufactured by SceneRay. Lead models 1200, 1210 and 1211 are now implemented on MNPS code.
•  New buttons were included into the initial menu of MNPS, CAT3D and TRACKER. They allow direct access to the following functions: “Home-Open Plan”, “Recent Plans” and “Export for Fusion”.
•  Additional tools for rendering KPTS files opening menu with <ALT-K>.
•  Rendering mode of the ROIs in the reformatted images (right side of planning window) can be changed with a small button at the top right corner.
•  The spacing between control points for SRS optimization is smaller, so the number of control points is greater, for PTV, OAR and OHT.
•  “Add ROIs” now can add up to 8 ROIs to create a new one. Previous version added only 2 ROIs.
•  Tool for estimation of lesion diameter and length resulting from radiofrequency heated tissue.
•  The conversion of atlas nucleus into ROI had a bug. The polygons of the ROIs were created in CW and CCW orientation. That creates errors evaluating volumes for mixed oriented ROIs. Now all polygons are converted to CCW after creation.
•  Check of distance AC-PC, AC-IHP and PC-IHP to avoid zero division conditions for wrong or malicious atlas setup.
•  Current controlled DBS systems now allows positive and negative signal to each lead.
•  Registration of X-ray pairs based on internal POIs shows the mean error of the registration after entering 6 or more markers. This allows the operator to detect a gross error locating the markers. The error is in screen pixel. Good registrations usually get error bellow 1.0 pixel.
•  While registering the X-ray image with POIs, the <BACKSPACE> key removes the last entered marker.
•  Template for centering targets in radiosurgery with Leksell stereotactic frame.
•  Template for centering targets in radiosurgery with “BrainLab” stereotactic frame.
•  Implemented Virtual Fiducials Mode for “BrainLab” frames.
•  Dicom importer allows frame selection based on diffusion gradient b-value equal to zero.
•  Extended syntax for IMAGE_TO_FLORED. If “IMAGE_TO_FOLDER = ID” in MNPS.INI or CAT3D.INI, the folder for patient images and plan starts with the ID, as presented in the Dicom file, followed by patient’s name.