Surgical navigation system

The Pari-Path surgical navigation system is a stereotactic accessory for Computed Tomography (CT) and Ultrasound imaging systems.

It displays the simulated image of an interventional instrument (a tracked insertion tool), such as a biopsy needle, an ablation needle, or probe, on a computer monitor that shows an image model of the target organs along with the current and projected path of the interventional instrument.
It is intended for treatment planning and intra-operative guidance for surgical procedures.
This FDA cleared imaging system is intended for visualizing anatomical structures during clinical interventions.
Good accuracy for navigation direction. It is about 0.5~1 degree in a wide region when using in good condition;
Sensor reusable. Expensive sensors are re-used for every procedur. Other disposal parts are affordable;
Applicable for different needle instruments. Sensors can be easily mounted on different needle-liked instruments;
Easy registering just on mouse click. There are no skin markers to handle; 
Easy CT and Ultrasound fusion. CT and Ultrasound are overlapped easily for better observation. No need for surgeons to select common spots on CT images and Ultrasound images. 
Strong 3D imaging functions. Surgical planning and real-time navigation are based on 3D image models of patients;
Detailed specified surgical planning feature. Simulating ablation area and needle placement are planned for needle tip to cover whole lesion region for optimal region treatment.


Pari-path surgical navigation

Other surgical navigation

Position accuracy

about 1~2 mm* in a wide region

In a region close to sensor

Direction accuracy

about 0.50~10 * in a wide region



popular needle-liked instruments

special needles only



expensive, disposal

Register method


(mapping image with world space)

pari-pathTM method

1. accurate in a wide region

2. register accuracy <1 mm*

displayed on screen

3. no need surgeons to handle markers

just a mouse click


metal-markers method

1.accurate in a wide region

2.need to handle markers

sensors as markers

1. good accurate in a region near to sensors

2. poor accurate in a region far from sensors

3. no need to handle markers

Fusion of CT & US


1. robust accuracy about

1~2 mm*

2. no need surgeons to select common spots on images

1. accuracy not robust, maybe poor to ~cm

2. need surgeons to select common spots on images

*Parameters (in root mean square) are typical on static objects with normal operations, may vary and are not guaranteed.


Operation steps:

Step ID 

Use par-pathTM navigation system

Time        (min)

Without navigation system

Time  (min)


Attach localization box on the skin

about 1

Attach localization metal grids on the skin

about 1


CT scanning

about 3

CT scanning

about 3


Transfer CT images to the navigation system via local network

about 0.3




Software operation:

segment, route plan and register.

optional operation: connect ultrasound, fuse CT and ultrasound

about 2

Software operation on CT system:     

measure,route plan

about 1


Attach reusable sensor clip

to the needle 

about 1








Measure and

mark an inserting point on the skin surface

about 1


Advance needle:

few times


Advance needle:

multiple times




For different functionsClick to play video.​