Continuous Bed Motion Scanning With Variable-Speed Sensitivity Zones
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Solution Overview
Problem
Current medical imaging systems using continuous bed motion (CBM) suffer from over-scanning, which results in inefficiencies and complications due to scanning areas above and below the target areas, leading to increased randoms, dead time, and pulse pile-up, especially when medical equipment is present.
Innovation Solution
A high sensitivity continuous bed motion (HS-CBM) scan protocol is implemented, which maximizes scan sensitivity within the area of interest by dividing the scan into zones with varying movement rates, eliminating over-scanning and optimizing bed movement to focus solely on the area of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous bed motion scanning is performed at constant speed over extended area, then complete scanning coverage is achieved, but over-scanning of areas above and below target areas occurs leading to increased randoms, dead time, and pulse pile-up
Solution Approach 1:
The scan area is divided into multiple zones along the bed movement direction, with each zone having optimized scanning parameters. The first zone corresponds to the target area of interest while the second zone corresponds to the over-scan area, allowing different movement rates to be applied to each zone to eliminate unnecessary over-scanning complications.
Solution Approach 2:
The bed movement rate is changed from constant to variable throughout the scan. The system operates at a first movement rate in the first zone (target area) and a second movement rate in the second zone (over-scan area), dynamically adjusting the scanning speed to maximize sensitivity in the area of interest while minimizing over-scanning effects.
2Productivity
If bed movement rate is increased to reduce scan time, then productivity improves, but scan sensitivity decreases
Solution Approach 1:
Different movement rates are applied to different zones of the scan area. The first zone (target area) uses a first movement rate optimized for sensitivity, while the second zone (over-scan area) uses a second movement rate optimized for speed, allowing local optimization of both sensitivity and productivity in their respective regions.
Data Source
AI summary
Various systems and computer-implemented methods for high sensitivity continuous bed motion (HS-CBM) scans are disclosed. A HS-CBM scan protocol comprising at least a first zone and a second zone is calculated. The HS-CBM scan maximizes scan sensitivity within an area of interest. A moveable bed is operated at a first movement rate within an imaging field of view of an imaging modality. The first movement rate corresponds to the first zone. The moveable bed is operated at a second movement rate within the imaging field of view of the imaging modality. The second movement rate corresponds to the second zone. A medical image is generated using scan data obtained in the first zone and the second zone.