Multi-sector CT Image Reconstruction via ECG-Gated Sector Combination
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Solution Overview
Problem
Conventional CT systems face limitations in achieving high temporal resolution due to limited scan time and image artifacts associated with motion in dynamic imaging contexts, such as cardiac imaging, where increased temporal resolution is necessary to capture clear images of moving anatomy.
Innovation Solution
The method involves acquiring projection data over an angular range of less than 180° plus a fan angle during multiple heartbeats, combining these data sets to generate a complete set of projection data, and reconstructing volumetric images at a specific cardiac phase, utilizing a CT imaging system with an X-ray source and detector rotating around the patient, and controlling the X-ray source activation based on heart cycle data to improve temporal resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If projection data is acquired over multiple heartbeats to increase temporal resolution, then temporal resolution is improved, but scan time increases and image artifacts appear at boundaries
Solution Approach 1:
The patent divides the full 360-degree scan into multiple sectors (e.g., 0-90°, 90-180°, 180-270°, 270-360°) and acquires each sector during different heartbeats. This segmentation allows temporal resolution improvement by using data from multiple cardiac cycles while reducing the scan time for each individual sector acquisition.
Solution Approach 2:
The patent utilizes the periodic nature of cardiac cycles to acquire projection data at specific phases of the heartbeat. By synchronizing data acquisition with the periodic cardiac rhythm and combining data from multiple periods, the system achieves high temporal resolution without requiring continuous scanning throughout the entire cardiac cycle.
2Measurement precision
If projection data is acquired over multiple heartbeats to increase temporal resolution, then temporal resolution is improved, but image artifacts appear at boundaries
Solution Approach 1:
The patent combines projection data from multiple heartbeats by merging the segmented sectors into a complete 360-degree data set. This merging process, when performed correctly, eliminates boundary artifacts while preserving the temporal resolution benefits of multi-heartbeat acquisition.
Solution Approach 2:
The patent employs feedback mechanisms to monitor and adjust the data acquisition process. By using ECG signals and real-time feedback about cardiac phase and data quality, the system can optimize the acquisition timing and parameters to minimize artifacts while maximizing temporal resolution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances temporal resolution in CT imaging, reducing motion artifacts and allowing for clearer imaging of the heart at specific phases, which can be applied to various dynamic imaging contexts beyond cardiac imaging.
Implementation Method 1
technologies such as computed tomography (CT) use various physical principles, such as the differential transmission of X-rays through the target volume, to acquire projection data
Data Source
AI summary
An approach is disclosed for acquiring multi-sector computed tomography scan data. The approach includes activating an X-ray source during heartbeats of a patient to acquire projection data over a limited angular range for each heartbeat. The projection data acquired over the different is combined. An image having good temporal resolution is reconstructed using the combined projection data.