Adaptive Contrast Agent Imaging Protocol Selection
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Solution Overview
Problem
Current imaging systems face challenges in accurately acquiring medical images with contrast agents due to varying peak times among patients, leading to potential over-radiation or incomplete data collection, which can result in inaccurate Cerebral Blood Volume (CBV) calculations and diagnosis issues, especially in patients with poor cardiac output.
Innovation Solution
A system that monitors contrast agent peak in real-time and adaptively adjusts image acquisition protocols based on patient-specific timing, using a computer-implemented system to select appropriate image acquisition protocols and post-processing methods, associating different contrast agent peak times with corresponding imaging protocols to optimize data collection and minimize radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If imaging is performed at longer time intervals to capture patients with later contrast agent peaks, then complete data collection is improved, but temporal resolution deteriorates and over-radiation occurs
Solution Approach 1:
The imaging system dynamically adjusts the time intervals between image acquisitions based on real-time detection of contrast agent peak timing. For patients with later peaks (e.g., poor cardiac output), the system extends imaging duration and adjusts intervals adaptively, rather than using fixed intervals. This resolves the contradiction by making the imaging protocol flexible and patient-specific, ensuring complete data collection without unnecessary over-radiation.
Solution Approach 2:
The system uses real-time feedback from contrast agent concentration measurements to adjust imaging parameters. By monitoring the actual contrast agent peak timing during the scan and comparing it to expected values, the system can adaptively modify subsequent imaging intervals to ensure adequate sampling of the contrast bolus tail, thereby maintaining both data completeness and temporal resolution.
2Measurement precision
If imaging is performed at shorter time intervals to improve temporal resolution, then measurement precision is improved, but over-radiation increases and data collection efficiency deteriorates
Solution Approach 1:
The system applies different imaging intervals to different time periods and patient types. Rather than using a uniform short interval for all patients, the system identifies patients who need higher temporal resolution (those with abnormal contrast kinetics) and applies shorter intervals only to them, while using longer intervals for patients with normal kinetics. This localizes the high-resolution imaging to where it is most needed, reducing overall radiation exposure.
Solution Approach 2:
The system changes the imaging parameter (time interval) based on detected contrast agent behavior. When the contrast agent peak occurs later than expected or the bolus tail extends longer, the system automatically adjusts the imaging interval to capture the extended timing, rather than maintaining a fixed short interval. This parameter adaptation ensures adequate temporal resolution only when necessary.
3Ease of operation
If a single stable scan protocol is used for majority of patients, then ease of operation is improved, but adaptability to individual patient variations deteriorates
Solution Approach 1:
The imaging system performs self-adjustment by automatically detecting contrast agent peak timing and selecting appropriate imaging protocols without requiring manual intervention. The system includes built-in logic to compare detected peak times against expected ranges and automatically modify acquisition parameters, making the system both easy to operate (automatic) and highly adaptable (patient-specific).
Solution Approach 2:
The imaging system incorporates multiple imaging protocols within a single system framework, allowing it to serve both the majority of patients with normal contrast kinetics (using standard protocol) and minority patients with abnormal kinetics (using extended protocols). This multi-functionality enables the system to maintain simplicity for common cases while providing adaptability for special cases.
Data Source
AI summary
An imaging system selects a medical imaging protocol using a repository of information associating multiple ranges of contrast agent peak time with corresponding different imaging protocols. An imaging protocol comprises a method for acquiring images using an imaging system and using data identifying at least one of (a) an imaging rate within an imaging scan cycle and (b) an interval between imaging scans. A contrast agent peak time comprises a time a contrast agent concentration substantially reaches a peak value in an anatomical region of interest of a patient relative to a time of start of contrast agent injection. A contrast agent peak time detector detects a contrast agent peak time. An imaging processor adaptively selects an imaging protocol from the imaging protocols in response to a comparison of a detected contrast agent peak time with at least one of the plurality of ranges.