Estimating Deflated Lung Shape for VATS
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Solution Overview
Problem
During minimally invasive thoracic surgery, the deflation of the lung changes its shape, making pre-surgical plans based on CT images less applicable, and it is not practical to perform another CT scan during the procedure, necessitating a solution to accurately update surgical plans in real-time.
Innovation Solution
A system and method for estimating the deflated lung shape using a computing device, which includes a total air volume estimation unit, an outflow air volume estimation unit, and a pre-operative plan transformation unit, allowing for the updating of surgical plans based on the estimated lung shape by comparing pre-surgical CT images with video images captured during the procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If pre-surgical plans are based on CT images of inflated lung, then surgical planning can be performed in advance, but the plans become inaccurate when lung is deflated during surgery
Solution Approach 1:
The system changes the parameter of lung volume from inflated state (CT scan) to deflated state (video image) by calculating air volume loss and applying geometric transformation to the 3D lung model, thereby adapting the pre-surgical plan to the actual intraoperative lung shape
Solution Approach 2:
The system creates a 3D copy of the lung from CT images and then transforms this digital model to represent the deflated state by removing air volume, allowing the surgical plan to be applied to the actual deflated lung geometry without requiring another CT scan
2Measurement precision
If another CT scan is performed during VATS procedure, then accurate lung shape information can be obtained, but it is not practical due to additional time and resources
Solution Approach 1:
The system replaces the mechanical CT scanning process with a computational method that uses video images and 3D modeling to estimate deflated lung shape, eliminating the need for additional imaging hardware and reducing procedural time
Solution Approach 2:
The system performs preliminary 3D lung model construction from preoperative CT images before surgery, enabling real-time transformation and adaptation during the actual surgical procedure without requiring additional preoperative imaging
3Ease of operation
If lung is deflated during VATS, then surgical access is improved, but the pre-surgical plan based on inflated lung shape becomes less applicable
Solution Approach 1:
The system dynamically transforms the static 3D lung model from inflated to deflated state by calculating volume loss and applying geometric deformation, allowing the surgical plan to adapt to the dynamic change in lung shape during the procedure
Data Source
Figure 1
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Figure 3a~3b
AI summary
The present teaching relates to surgical procedure assistance. In one example, a first volume of air inside a lung is obtained based on a first image of the lung captured prior to a surgical procedure. The lung has a first shape on the first image. A second volume of air deflated from the lung is determined based on a second image of the lung captured during the surgical procedure. A second shape of the lung is estimated based on the first shape of the lung and the first air volume inside the lung and second volume of air deflated from the lung. A surgical plan is updated based on the estimated second shape of the lung.