Nuclear Medicine Detector Pivoting for Extended Axial Field of View
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Nuclear Medicine (NM) imaging systems with limited axial field of view struggle to capture dynamic studies of larger regions of interest, requiring multiple images at different times, which are not clinically useful for comprehensive diagnostics.
Innovation Solution
An imaging system with a gantry and translatable bed, allowing NM detectors to iteratively move between axial positions to acquire imaging information, reconstructing images with a larger axial field of view than the detectors' capabilities, enabling simultaneous or concurrent imaging of multiple regions of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a nuclear medicine imaging system uses detectors with a fixed axial field of view, then the system can acquire images quickly, but it cannot image larger portions of the body or organs that extend beyond the field of view
Solution Approach 1:
The system dynamically adjusts the axial position of the detector head during the imaging process. The detector head moves along the axial direction to scan different regions of the subject, enabling coverage of a larger volume than the static field of view would allow. This dynamic positioning resolves the contradiction by making the field of view coverage adaptable rather than fixed.
Solution Approach 2:
The system adds axial movement capability to the detector head, transforming a 2D field of view into an effective 3D coverage volume. By introducing movement along the axial dimension, the system expands its imaging capability from a limited planar view to a volumetric coverage, allowing imaging of larger portions of the body without proportionally increasing acquisition time.
2Volume of moving object
If the system acquires a series of images at different times to cover larger regions, then it can image larger portions of the body, but the images are not as clinically useful for dynamic studies
Solution Approach 1:
The system performs continuous or near-continuous scanning along the axial direction, maintaining uninterrupted data acquisition throughout the extended field of view. This continuous action ensures that dynamic processes are captured without temporal gaps, preserving the clinical utility for dynamic studies while achieving comprehensive volumetric coverage.
Solution Approach 2:
The system pre-plans the axial scanning trajectory and timing to ensure all required regions are covered within the optimal time window for dynamic studies. By preparing the scan path in advance and executing it efficiently, the system captures all necessary anatomical regions during the critical dynamic phase, maintaining clinical reliability.
3Volume of moving object
If the system uses multiple detector heads or moves detector heads to different positions, then it can image larger regions, but the device complexity increases
Solution Approach 1:
The system divides the imaging task into multiple axial segments by moving the detector head to different positions along the axial direction. Instead of using multiple detector heads simultaneously, a single detector head sequentially scans different axial segments, achieving comprehensive coverage while keeping the hardware configuration simple and manageable.
Solution Approach 2:
The detector head is designed to perform multiple functions: it can detect radiation from different axial positions and acquire data for various anatomical regions. This multi-functional capability allows a single detector head to replace what would otherwise require multiple fixed detector heads, reducing device complexity while maintaining comprehensive imaging coverage.
Data Source
AI summary
An imaging system includes a rotating gantry, a bed, plural nuclear medicine (NM) imaging detectors, and a processing unit. The rotating gantry has a bore. The NM detectors are disposed about the bore of the gantry. The NM detectors each have an in-plane field of view, and are configured to pivot about a corresponding axis with respect to the gantry to change the in-plane field of view. The processing unit is configured to acquire first NM imaging information at a first gantry rotational position, with the in-plane fields of view of the NM imaging detectors parallel to a predetermined direction; actuate the gantry to rotate to a second gantry rotational position; actuate the NM imaging detectors to pivot such that the in-plane fields of view are parallel to the predetermined direction; acquire additional NM imaging information at the second gantry rotational position; and reconstruct a planar image of the object.