Adaptive Contrast Bolus Timing for Stroke Imaging
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Solution Overview
Problem
Current diagnostic imaging protocols for acute stroke management, such as CT angiography and perfusion studies, face challenges in timing the administration of second contrast agent boluses, leading to non-diagnostic images due to venous contrast contamination or delayed patient treatment.
Innovation Solution
The method involves estimating the arterial inflow and venous outflow functions based on initial contrast agent injection data, using machine learning models to determine the optimal timing for the second contrast bolus administration, ensuring precise timing to avoid contamination while minimizing scan duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a timing bolus scan is performed to determine optimal contrast timing, then the contrast timing precision is improved, but the total scan time increases by five minutes
Solution Approach 1:
The system performs preliminary monitoring of contrast agent concentration in the venous system during the first bolus passage to predict when venous return to baseline will occur. This preliminary action eliminates the need for a separate timing bolus scan, as the monitoring data collected during the first contrast passage is sufficient to determine optimal timing for the second bolus administration.
2Measurement precision
If CTA and CTP studies are performed separately, then the diagnostic accuracy is improved, but the time required for both acquisitions increases by five to seven minutes
Solution Approach 1:
The system merges the CTA and CTP acquisitions into a single continuous scan protocol. By using the monitored venous return to baseline timing from the first contrast bolus, the system can immediately administer the second bolus and perform both CTA and CTP acquisitions without the traditional five to seven minute wait time, thereby reducing total acquisition time while maintaining diagnostic accuracy.
3Productivity
If the second contrast bolus is administered too early, then the scan time is reduced, but venous contrast contamination occurs degrading image quality
Solution Approach 1:
The system uses real-time monitoring of contrast agent concentration in the venous system as feedback to determine the optimal timing for administering the second contrast bolus. By measuring when the venous concentration returns to baseline levels after the first bolus, the system can precisely time the second bolus administration to avoid venous contrast contamination while minimizing wait time.
4Object-affected harmful factors
If the second contrast bolus is administered too late, then venous contrast contamination is avoided, but patient treatment is delayed
Solution Approach 1:
The system replaces the traditional mechanical waiting period (five to seven minutes) with an intelligent timing system that uses contrast concentration monitoring and predictive algorithms. This substitution allows the second bolus to be administered at the precise moment when venous contrast has returned to baseline, eliminating unnecessary waiting time while ensuring no venous contamination occurs.
Data Source
AI summary
Methods and systems are provided for adaptive scan control. In one embodiment, a method includes upon a first contrast injection, processing acquired projection data of a subject to measure a contrast signal of the first contrast injection, estimating a time when a venous return to baseline (VRTB) of the first contrast injection is to occur based on the contrast signal, and commanding initiation of a second contrast injection at the estimated time.