Nuclear Medicine Motion Gating From List Mode Data
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Solution Overview
Problem
Nuclear medicine image gathering is affected by respiration and heartbeat motions, and existing synchronous reconstruction techniques using external devices cause burden and inaccuracies.
Innovation Solution
A nuclear medicine diagnostic apparatus that analyzes respiration and heartbeat motions using list mode data without external devices, generating synchronized images by dividing data sets for specific phases and applying motion vectors to combine images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If external devices are attached to measure respiration and cardiac pulsation for synchronous reconstruction, then image quality is improved by suppressing motion influences, but burden on subject and operator increases
Solution Approach 1:
The nuclear medicine diagnostic apparatus performs self-measurement of respiration and cardiac pulsation using its own detection capabilities and list mode data, eliminating the need for external measurement devices. The system analyzes its own operational data to extract motion information, thereby serving itself rather than requiring external assistance.
Solution Approach 2:
List mode data serves as an intermediary that connects the nuclear medicine detection system with motion analysis. By using the temporal and spatial information already captured during nuclear medicine imaging, the system derives respiration and cardiac pulsation signals without requiring separate external measurement apparatus.
2Measurement precision
If external devices are used for synchronous reconstruction, then respiration and cardiac pulsation phases can be measured, but measurement accuracy is reduced due to device-related inaccuracies
Solution Approach 1:
The system uses its own list mode data to measure respiration and cardiac pulsation phases, eliminating measurement errors introduced by external devices. The internal detection system captures motion information with the same reliability and precision as the primary imaging function.
3Ease of operation
If list mode data is divided for respective respiration phases and cardiac pulsation phases without external devices, then burden on subject and operator is reduced, but image reconstruction accuracy may be compromised
Solution Approach 1:
The list mode data is segmented into respective respiration phases and cardiac pulsation phases based on analysis of the data itself. This segmentation enables separate reconstruction for each phase, maintaining image reconstruction accuracy while eliminating the need for external devices.
Solution Approach 2:
The system uses feedback from list mode data analysis to guide the segmentation and reconstruction process. By continuously analyzing the detected data to identify motion phases and using this information to guide further processing, the system maintains accuracy without external intervention.
Data Source
AI summary
A nuclear medicine diagnostic apparatus includes processing circuitry configured to analyze respiration motion based on list mode data obtained through nuclear medicine scan on a subject having respiration motion and heartbeat motion, generate first images from respective division data sets obtained by dividing the list mode data for respective respiration phases as phases of the respiration motion, analyze the heartbeat motion for the respective respiration phases based on the list mode data, and generate second images from respective division data sets obtained by dividing phase data, obtained by dividing the list mode data for the respective respiration phases, for respective cardiac pulsation phases as phases of the heartbeat motion.