Dental 3D X-ray Volume Positioning via Graphical Overlay
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Solution Overview
Problem
Current cone-beam X-ray devices face challenges in accurately preselecting the position and size of the volume to be radiographed, especially for smaller regions of interest, leading to complexity in positioning aids and potential misalignment during the creation of dental 3D radiographs.
Innovation Solution
The method involves using a graphical representation of the object, which can include optical images or existing 3D images, to accurately position and size the volume to be radiographed before creating a 3D radiograph, allowing for real-time adjustment of the X-ray emitter and detector's position and rotation parameters based on the graphical data, ensuring precise alignment and correct placement of the volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical or optical positioning aids are used to preselect the position and size of the volume, then the positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent uses a graphical representation (copy) of the object's surface or contour to display the volume to be radiographed. This graphical copy allows the operator to visually identify and position the volume of interest without requiring complex mechanical or optical positioning aids, thereby improving positioning accuracy while reducing device complexity.
2Measurement precision
If the size of the volume to be examined decreases, then the imaging precision is improved, but the positioning difficulty increases
Solution Approach 1:
The patent transitions from 2D radiographic images to a 3D volumetric representation with graphical overlay. By displaying the volume to be radiographed as a graphical representation superimposed on the object's surface or contour, the system enables precise positioning of small volumes of interest in three-dimensional space, making it easier to detect and measure small regions while maintaining high imaging precision.
3Measurement precision
If the volume position is preselected based on graphical representation, then the placement accuracy is improved, but the time for position determination increases
Solution Approach 1:
The patent performs preliminary action by displaying the graphical representation of the volume to be radiographed on the object's surface or contour before actual radiography. This pre-display allows the operator to identify and confirm the correct position and size of the volume of interest in advance, improving placement accuracy while the rapid display capability minimizes time loss.
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 enables more accurate and precise positioning of the volume of interest, reducing the likelihood of incorrect placement and improving the quality of the 3D radiograph by aligning external and internal features of the object, allowing for better selection of the region of interest based on anatomical structures.
Implementation Method 1
a system comprising an X-ray emitter (4) and an X-ray detector (6), by means of which it is possible to reproduce a volume in the form of a 3D radiograph from a plurality of projected images
Implementation Method 2
an optical camera is provided on an X-ray emitter for creating an optical image of the patient's head being X-rayed by said emitter
Data Source
AI summary
In a method for the creation of a dental 3D radiograph of at least a subregion, forming a volume, of an object using an X-ray apparatus, the volume is recorded as a 3D radiograph from a plurality of projected images during a revolution around the object. At least a part of the object is displayed in a graphical representation before the radiograph of the volume is created, the position of the graphical representation relative to the current position of the apparatus and the patient being known. The volume to be radiographed, governed by the positioning of the object relatively to the apparatus and by the choice of the settings data and/or control data, is placed in the graphical representation in an at least approximately correct position, and when there is a change in position and/or size of the volume to be radiographed within the graphical representation, the settings data and/or control data for the creation of the 3D radiograph are defined.