Motion Compensation via Active Marker Tracking in Medical Imaging
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Solution Overview
Problem
Conventional medical imaging techniques struggle to accurately compensate for intrafraction movement, particularly respiratory motion, leading to image artifacts that affect diagnosis and treatment planning, with existing methods like breath-hold and breathing coaching being limited in effectiveness and applicability.
Innovation Solution
An imaging and localization system that uses implantable active markers to track the real-time location of a planning target volume within the thoracic cavity, synchronizing raw image data with localization data to produce motion-compensated images, thereby accounting for non-linear and unpredictable motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If breath-hold or breathing coaching techniques are used to compensate for respiratory motion, then image artifacts are reduced to some extent, but these techniques are limited in effectiveness and applicability (only about 40% of lung cancer population can hold breath adequately, and breathing coaching cannot account for irregular motion)
Solution Approach 1:
The patent replaces mechanical breath-hold and breathing coaching techniques with an automated electromagnetic tracking system. The system uses active markers implanted in the lung and electromagnetic sensors to automatically detect and track respiratory motion in real-time, eliminating the need for patient cooperation and providing continuous, accurate motion monitoring regardless of breathing pattern.
Solution Approach 2:
The patent implements a feedback mechanism where the electromagnetic tracking system continuously monitors respiratory motion and provides real-time position data to the imaging system. This feedback allows the imaging system to dynamically adjust and compensate for motion during the scanning process, improving both reliability and adaptability.
2Productivity
If conventional imaging techniques are used without motion compensation, then the imaging process is simple and quick, but imaging artifacts (blur, distortion) are produced that affect diagnosis and treatment planning
Solution Approach 1:
The patent performs preliminary action by implanting active markers in the lung before the imaging scan. These markers serve as reference points that will be tracked throughout the scanning process, enabling real-time motion compensation without delaying the actual imaging acquisition.
Solution Approach 2:
The patent creates a multi-functional system where the electromagnetic tracking system serves multiple purposes: it tracks respiratory motion, provides real-time position data for motion compensation, and can potentially guide treatment delivery. This universal approach improves image quality without requiring separate specialized equipment for each function.
Data Source
AI summary
Medical imaging and localization methods and systems for producing a motion-compensated image of a planning target volume (PTV) of a patient. In one embodiment, an imaging and localization system includes sensors that are positioned to receive an electromagnetic location signal from one or more active markers affixed to or adjacent a PTV. A signal processing component can produce real-time localization data corresponding to the location signal, and a system interface can receive such localization data. The system interface can also receive raw image data from an imaging subsystem and process the raw image data based on the localization data. For example, the imaging subsystem can include a computed tomography (CT) imaging system and image slices or frames can be binned based on the localization data.