X-ray CT Gantry Rotation for Scanogram Imaging
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Solution Overview
Problem
Conventional X-ray CT apparatuses require significant time for data acquisition due to the need for couch movement during scanogram imaging, which is used to determine scanning conditions, leading to inefficiencies and increased setup times.
Innovation Solution
An X-ray CT apparatus that includes an X-ray tube, area detector, rotary frame, generation circuitry, and controller, allowing for the generation of a reference image without couch movement by radiating cone beam-shaped X-rays and setting imaging conditions based on this image, thereby reducing setup time and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scanogram imaging is performed by driving and moving the couch, then positioning and reference image acquisition are achieved, but data acquisition time and setup time increase significantly
Solution Approach 1:
The gantry is rotated to a predetermined position in advance, and the X-ray tube radiates X-rays to acquire projection data before the main scanning process begins. This preliminary action eliminates the need for couch movement during reference image acquisition, thereby reducing data acquisition time while maintaining positioning accuracy through the pre-positioned gantry.
Solution Approach 2:
The patent replaces the mechanical couch movement system with a gantry rotation system for acquiring reference images. Instead of moving the couch to different positions for scanogram imaging, the gantry is rotated to predetermined positions to acquire projection data from multiple angles, substituting mechanical table movement with rotational positioning that is faster and more efficient.
2Adaptability or versatility
If scanogram imaging is performed in multiple directions, then comprehensive positioning information is obtained, but the number of couch movements and setup time increase
Solution Approach 1:
The gantry rotation system serves multiple functions: it can acquire projection data from different predetermined positions (0°, 90°, 180°, 270°) to provide comprehensive positioning information, and it can also perform the main scanning function. This multi-functional approach eliminates the need for separate couch movements for each imaging direction, reducing operational complexity while maintaining complete positioning information.
Solution Approach 2:
The patent transitions from linear couch movement to rotational gantry movement, adding a rotational dimension to the imaging process. By rotating the gantry to predetermined angular positions, the system acquires projection data from multiple directions without requiring repeated linear couch movements, thereby simplifying operations while maintaining comprehensive positioning coverage.
3Manufacturing precision
If conventional scanogram imaging is used to determine scanning conditions, then accurate imaging parameters are set, but the overall examination time is prolonged
Solution Approach 1:
Projection data is acquired from predetermined gantry positions before the main scanning begins, allowing scanning conditions to be determined in advance. This preliminary data acquisition provides accurate information for setting imaging parameters such as tube current and voltage, while occurring in parallel with or before patient positioning, thereby maintaining imaging condition accuracy without prolonging the overall examination time.
Solution Approach 2:
The gantry rotation for acquiring projection data at predetermined positions is integrated into the continuous workflow without requiring interruption for couch movement. The X-ray tube continuously radiates X-rays while the gantry rotates to predetermined positions, maintaining continuous useful action and eliminating idle time, thus preserving imaging condition accuracy while improving examination throughput.
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 allows for faster data acquisition and reduced setup times by eliminating the need for couch movement during reference image generation and subsequent scanning, while also reducing X-ray exposure and improving imaging efficiency.
Implementation Method 1
an X-ray tube configured to radiate cone beam-shaped X-rays
Implementation Method 2
an area detector configured to detect the X-rays having radiated from the X-ray tube and passed through a subject
Data Source
AI summary
According to one embodiment, an X-ray computed tomography (CT) apparatus includes an X-ray tube, an area detector, a rotary frame, generation circuitry, processing circuitry, and a controller. The generation circuitry is configured to generate a reference image of the subject based on an output from the area detector that is given in response to radiation of the X-rays from a predetermined position around the rotational axis for a period required to perform on/off control of radiation of the X-rays. The processing circuitry is configured to set, based on the reference image, an imaging condition for use in scanning for the subject. The controller is configured to control the scanning based on the set imaging condition.