CT Planning Projection for Scan Range Accuracy
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Solution Overview
Problem
Current computer tomography (CT) planning methods are inefficient in accurately determining scanable regions and dose distribution, leading to potential errors and repeated X-ray exposure.
Innovation Solution
A method involving the recording of a 2D topogram, determining position-dependent information, and projecting this information onto the examination object using a projection device, such as a light projector, to clearly display scannable and non-scannable areas, reducing planning errors and enabling early user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a 2D topogram is recorded to plan the CT examination, then overview information is obtained, but position-dependent information (scan ranges, dose distribution) is not accurately displayed
Solution Approach 1:
The patent projects position-dependent information from the 2D topogram onto the 3D surface of the patient's body. This dimensional transformation allows scan ranges and dose distribution data to be displayed in their correct spatial context on the patient's anatomy, enabling accurate visualization of position-dependent information that cannot be effectively conveyed in a flat 2D image alone.
2Ease of operation
If scan ranges are planned using 2D topogram without projection, then planning is simpler, but errors in scan range determination occur
Solution Approach 1:
The patent creates a visual copy of the scan ranges and dose distribution information by projecting it directly onto the patient's body surface. This projected copy serves as an accurate reference that can be viewed from multiple angles, allowing planners to verify scan range accuracy without complex calculations, thus maintaining operational simplicity while improving reliability.
3Measurement precision
If repeated topograms are recorded to verify scan ranges, then planning accuracy improves, but X-ray dose increases
Solution Approach 1:
The patent performs the projection of position-dependent information onto the patient's body surface during the initial planning phase, before any additional topogram recordings are considered. This preliminary visualization of scan ranges and dose distribution allows accurate verification without requiring repeated X-ray exposures, thereby preventing unnecessary radiation dose while maintaining planning accuracy.
4Productivity
If position-dependent information is not projected onto the patient, then device complexity is lower, but user understanding of scan ranges is poorer
Solution Approach 1:
The patent utilizes the existing projection device, already present in the CT system for other purposes, to also project position-dependent information such as scan ranges and dose distribution onto the patient's body. This multi-functional use of the projection device avoids adding significant system complexity while enhancing examination efficiency through improved visual communication of planning parameters.
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 simplifies and enhances CT planning by accurately displaying scan ranges and dose distribution directly on the patient, reducing errors and preventing unnecessary exposures, thereby improving patient safety and examination efficiency.
Implementation Method 1
projecting the information, which has been ascertained from the overview image, onto the surface of the examination object in a correct position
Data Source
AI summary
An embodiment of the invention relates to a method for planning support for a computer tomography recording of an examination object by means of a computer tomography device, including the following steps: recording a 2-D overview image (topogram) of the examination object by means of the computer tomography device, determining position-dependent information by means of the overview image, forwarding the information to a projection device, and correct positioned displaying the information on the surface of the examination object.