Overlapping Image Localization for Surgical Instrument Tracking
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Solution Overview
Problem
Current image-guided surgery techniques require frequent X-ray exposures, leading to increased radiation exposure for patients and medical personnel, and often result in inaccurate instrument positioning due to virtual representation drift and patient motion, necessitating a system that can accurately position instruments with minimal X-ray usage and real-time accuracy.
Innovation Solution
A computer-assisted imaging localization system that displays actual instrument positions using overlapping images, allowing for precise alignment with limited X-ray exposure by tracking the instrument's movement and recalibrating based on low-dose images, mimicking live fluoroscopy without continuous radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequent X-ray exposures are used for image-guided surgery, then instrument positioning accuracy is improved, but radiation exposure to patient and medical personnel increases
Solution Approach 1:
The patent creates a virtual copy of the patient's anatomy using pre-operative CT or MRI scans to generate a 3D model. This virtual anatomical model is then overlaid with real-time instrument tracking data, allowing surgeons to visualize instrument positions relative to anatomical structures without requiring frequent X-ray exposures. The virtual model serves as a radiation-free reference that can be continuously updated and displayed.
Solution Approach 2:
The patent replaces the mechanical X-ray imaging system with an optical/electronic tracking system. Instead of using X-rays to capture instrument positions, the system uses optical markers and cameras to track instrument locations. This substitution eliminates radiation exposure while maintaining the ability to monitor instrument positions throughout the procedure.
2Object-affected harmful factors
If X-ray exposure is reduced to minimize radiation, then safety is improved, but instrument positioning accuracy deteriorates due to virtual representation drift
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously compares the tracked instrument position with the virtual anatomical model and provides real-time visual feedback to the surgeon. The overlay display shows the instrument's actual position relative to the planned trajectory and anatomical landmarks, allowing for immediate correction of any drift or positioning errors without requiring additional X-ray verification.
Solution Approach 2:
The patent performs preliminary actions by creating a detailed virtual anatomical model before the surgical procedure begins. This pre-operative planning phase includes defining the surgical trajectory, identifying anatomical landmarks, and establishing reference points. By preparing this comprehensive virtual roadmap in advance, the system eliminates the need for intraoperative X-rays to guide positioning decisions.
3Object-affected harmful factors
If virtual representation is used to guide surgery, then radiation exposure is reduced, but positioning accuracy deteriorates due to drift and patient motion
Solution Approach 1:
The patent implements self-service through automatic registration and tracking algorithms that continuously align the virtual anatomical model with the patient's actual anatomy. The system automatically detects and compensates for patient motion by tracking reference markers on the patient's body and adjusting the virtual model's position accordingly. This self-adjusting capability maintains alignment stability without requiring manual intervention or additional imaging.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system enhances accuracy and reduces radiation exposure by allowing real-time instrument positioning with minimal X-ray usage, maintaining precision and safety during surgical procedures.
Implementation Method 1
The C-arm includes a radiation source that is positioned beneath the patient and that directs a radiation beam upward to the receiver
Implementation Method 2
Fluoroscopy, or fluoro, is one form of intraoperative X-ray and is taken by a fluoro unit, also known as a C-arm. The C-arm sends X-ray beams through a patient and takes a picture of the anatomy in that area
Data Source
AI summary
A computer-assisted imaging and localization system assists the physician in positioning implants and instruments into a patient's body. The system displays overlapping images—one image of the surgical site with the patient's anatomy and another image showing the implant(s) or instrument(s). The overlapping image of the implant/instrument is moved over the static image of the anatomy as the implant/instrument is moved. The moving image of the implant/instrument can be an unaltered image or an image altered to intensify or mitigate the anatomical or non-anatomical aspects of the moving image. Sliding these images over one another helps the surgeon in positioning devices or instruments with a high degree of accuracy and with a limited number of additional x-rays.