Contrast Agent Injection Curve for CT Scan Parameter Optimization
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Solution Overview
Problem
Conventional methods for contrast agent-enhanced CT imaging fail to ensure uniform contrast quality across all areas of the body during imaging, particularly in CT angiography, due to mismatched contrast agent protocols and changing blood flow rates, leading to suboptimal contrast in certain regions.
Innovation Solution
A method for automatically determining a contrast agent protocol that involves an overview recording to identify the precise positions of structures within the body, defining recording time points, and creating a contrast agent injection curve to optimize contrast agent distribution and concentration, synchronizing it with imaging parameters like rotation time and collimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional bolus-tracking scan or test-bolus scan is used to determine contrast agent parameters, then the starting time for CT imaging can be determined, but the contrast agent concentration and flow rate cannot be optimized for different z-positions during the imaging process
Solution Approach 1:
The imaging region is divided into multiple z-positions (first, second, third positions along the z-axis), and separate recording time points are determined for each position. This segmentation allows independent optimization of contrast agent timing for each anatomical level, resolving the contradiction between achieving uniform contrast quality and adapting to varying blood flow rates at different positions.
Solution Approach 2:
The system dynamically adjusts the contrast agent injection parameters by determining position-specific recording time points based on the imaging protocol. The contrast agent flow rate and concentration are optimized for each z-position according to its specific blood flow characteristics, enabling temporal matching throughout the imaging process rather than using a single fixed protocol.
2Productivity
If high-speed rotation and high feed rate are used in modern multi-line CT devices, then imaging speed is improved, but the imaging may overtake the contrast agent bolus resulting in non-optimum contrast
Solution Approach 1:
The system performs preliminary determination of position-specific recording time points before the actual imaging process. By calculating the optimal imaging timing for each z-position in advance based on the contrast agent injection curve, the system ensures that the high-speed imaging will capture images at the precise moments when optimal contrast is present, preventing the imaging from overtaking or missing the contrast bolus.
Solution Approach 2:
The system uses feedback from the contrast agent injection curve and blood flow rate characteristics to continuously optimize the imaging timing. The recorded attenuation values and contrast agent concentration measurements feed back into the system to adjust and refine the recording time points for each z-position, ensuring that the high feed rate imaging remains synchronized with the contrast agent bolus throughout the examination.
3Device complexity
If fixed contrast agent parameters are used during CT imaging, then the imaging protocol is simple, but it is not possible to predict how the contrast will develop at different times at different positions
Solution Approach 1:
The system changes multiple parameters including contrast agent concentration, flow rate, and recording time points for each z-position based on measured blood flow rates and attenuation values. By dynamically adjusting these parameters according to position-specific characteristics, the system achieves accurate prediction of contrast development throughout the imaging process while maintaining manageable protocol complexity through automated calculation.
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 ensures consistent and optimal contrast quality throughout the imaging process by precisely controlling the contrast agent flow and concentration at specific times and positions, improving image quality in all areas of interest.
Implementation Method 1
projection measured data can be acquired via a computed tomography system (CT systems)... The patient is irradiated with X-rays from the X-ray source during one or more cycles, wherein projection measured data or X-ray projection data is acquired via the opposite X-ray detector
Implementation Method 2
When visualizing functional relationships and structures of patients' bodies, so-called contrast agents are used during medical imaging... an attenuation value in a larger vessel, for example the aorta, is measured as a function of the time following the commencement of the contrast agent injection
Data Source
AI summary
A method for the automatic determination of a contrast agent protocol for a contrast agent-enhanced medical imaging method is described. The method includes an overview recording of a region of interest of an object under examination. In addition, an image recording protocol including a plurality of recording parameters is defined on the basis of the overview recording. Furthermore, recording time points are determined for a plurality of z-positions of the region of interest on the basis of the image recording protocol. In addition, the structures acquired with the overview recording are assigned to the recording time points determined. Finally, a contrast agent protocol including the temporal course of a contrast agent injection curve is defined as a function of the acquired structures and the assigned recording time points. A contrast agent protocol determination device is also described, as well as an imaging medicinal device.