Adjustable Registration Frame for Medical Device Tracking
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Solution Overview
Problem
Existing image-guided medical procedures require the insertion device to be partially included in the scanned volume, leading to excessive radiation exposure for patients and medical staff, as determining the device's position and orientation relative to the image space is challenging when it is outside the scanned volume.
Innovation Solution
The use of an adjustable registration frame mounted on the patient's body, which transforms from a moldable to a structurally stable state, allowing for real-time determination of the device's position and orientation using registration members positioned either on or inside the mounting pad, minimizing the scanned volume and reducing radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the device is included in the scanned volume to determine its position and orientation, then measurement precision is improved, but radiation exposure increases
Solution Approach 1:
The system divides the tracking function into two parts: registration markers remain on the device while separate registration members are placed in the scanned volume. This segmentation allows position determination without including the entire device in the scan, reducing radiation exposure while maintaining measurement precision.
Solution Approach 2:
Registration members act as intermediaries between the device and the imaging system. These members are placed within the scanned volume and provide reference points for position determination, eliminating the need to include the device itself in the scan while still enabling accurate tracking.
2Object-affected harmful factors
If the scanned volume is reduced to minimize radiation exposure, then radiation exposure is reduced, but measurement precision deteriorates
Solution Approach 1:
The critical tracking elements (registration members) are extracted from the device and placed independently in the scanned volume. This allows the scanned volume to be minimized to only what is necessary for tracking, reducing radiation exposure while maintaining the ability to determine device position and orientation through the registered relationship between markers and members.
Data Source
AI summary
A system for determining the position and orientation of a medical device relative to an image space during image-guided medical procedures. The system comprises a flexible pad mounted on the subject such that a part covers the region of interest. The pad incorporates detectable registration members. Prior to the procedure, the device is coupled to the pad, which is then rigidized, so that there is no movement of the registration members relative to each other and relative to the device. The fixed relationship between the device and the registration members is determined from initial images, for example using detectable markers attached to the device, enabling the pose of the device relative to the image space of images of the region of interest to be determined later, even if the device is remote from the region of interest. This minimizes exposure of the subject and medical staff to radiation.