Instrument Shape Assessment for Registration Accuracy
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Solution Overview
Problem
The existing registration procedures for image-guided interventional procedures are often prolonged and inaccurate due to inadequate preparation of the instrument shape, leading to inefficient registration processes and potential inaccuracies during the actual procedure.
Innovation Solution
An assessing device that determines shape feature values, such as curvature values along the instrument, to provide a suitability value indicating the instrument's shape suitability for registration, allowing users to modify the shape for accurate registration without increasing the overall procedure time, and potentially reducing radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the registration procedure is performed without assessing instrument shape suitability first, then the registration process can start immediately, but the registration accuracy deteriorates and may require repetition
Solution Approach 1:
The patent applies preliminary action by assessing the instrument shape suitability before starting the registration procedure. The assessing device calculates shape feature values and determines suitability in advance, allowing users to modify the instrument shape if needed before registration begins. This prevents inaccurate registration and potential repetition while maintaining efficient workflow.
2Measurement precision
If multiple images are acquired during registration to ensure accurate alignment, then the registration accuracy improves, but the radiation exposure increases
Solution Approach 1:
The patent reduces radiation exposure by performing shape assessment and suitability evaluation before any imaging occurs. By determining whether the instrument shape is suitable for registration in advance using non-radiation methods, the system minimizes the number of images that need to be acquired during the registration procedure, thereby reducing cumulative radiation exposure to the patient.
Solution Approach 2:
The assessing device provides feedback on shape suitability based on calculated shape feature values. This feedback mechanism allows users to adjust the instrument shape before registration, ensuring that the first acquired images are likely to be suitable for accurate registration, thereby reducing the need for additional images and associated radiation exposure.
3Productivity
If the instrument shape is not properly prepared before registration, then the preparation time is reduced, but the registration accuracy deteriorates leading to procedure repetition
Solution Approach 1:
The patent implements preliminary shape assessment to evaluate instrument suitability before registration begins. This allows for quick determination of whether the current instrument shape is appropriate, enabling users to make minor adjustments if needed without extensive preparation, thereby maintaining high registration efficiency while ensuring accurate results.
Data Source
AI summary
The invention relates to an assessing device (13) for assessing the suitability of a shape of an instrument like a guidewire for a registration of a position and shape determination device (10) like an optical shape sensing device with an imaging device (2). Curvature values being indicative of the curvature at several positions along the instrument are determined, which are used for determining shape feature values. These shape feature values are then used for determining a suitability value being indicative of the suitability of the shape of the instrument for the registration procedure, wherein an output is provided to a user based on the determined suitability value. The user can therefore modify the shape until the output indicates that the shape of the instrument is suitable for the registration, without requiring any image. This can reduce a radiation dose if the image is, for instance, an x-ray image.