Iso-centering in C-arm CT Using Scout Image Geometry
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Solution Overview
Problem
Current methods for iso-centering in C-arm examination apparatuses require multiple position adjustments and exposure to X-ray radiation, which are time-consuming and expose both patients and clinical staff to radiation.
Innovation Solution
An apparatus and method that utilize pre-acquired scout images, processed with geometrical calculations, to select and adapt iso-centering images for display, allowing for precise alignment of the object of interest with the iso-center without the need for additional X-ray exposure, using a patient support unit, acquisition unit, data processing, and display unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional iso-centering methods using fluoroscopy and multiple position adjustments are used, then the iso-center position can be verified, but both patient and clinical staff are exposed to X-ray radiation and the process is time-consuming
Solution Approach 1:
The system performs preliminary actions by acquiring scout images before the actual CBCT scan and using these images to determine the iso-center position. The method calculates the iso-center coordinates (Xc, Yc, Zc) from pre-acquired scout images at different table positions, allowing the iso-center to be identified without additional radiation exposure during the positioning phase.
Solution Approach 2:
The system creates a copy of the anatomical structure information from scout images and uses this copied data to determine the iso-center position. Instead of using real-time fluoroscopy during positioning, the method works with copied image data from previously acquired scout images, eliminating the need for continuous radiation exposure during the iso-centering process.
2Measurement precision
If multiple scout images are acquired at different table positions to determine iso-center, then accurate positioning can be achieved, but the time required for CBCT preparation increases
Solution Approach 1:
The system replaces the mechanical/physical process of moving the C-arm to different positions for fluoroscopy verification with a computational approach. Instead of physically repositioning equipment and acquiring new images, the method uses geometric calculations on existing scout image data to determine the iso-center, significantly reducing preparation time.
Solution Approach 2:
The system performs self-service by automatically calculating the iso-center position from the acquired scout images without requiring manual intervention or additional verification steps. The data processing unit automatically determines the iso-center coordinates (Xc, Yc, Zc) from the scout images, eliminating the need for time-consuming manual positioning and verification.
3Measurement precision
If the C-arm is moved between AP and lateral positions to verify iso-center from different views, then comprehensive position verification is achieved, but the process becomes more complex and time-consuming
Solution Approach 1:
The system achieves multi-functionality by using a single imaging setup (the scout image acquisition system) to obtain all necessary information for iso-center determination. Instead of requiring separate fluoroscopy setups in AP and lateral positions, the method processes scout images to extract iso-center information from multiple perspectives through geometric calculations, simplifying the overall process.
Data Source
AI summary
An apparatus for medical imaging of a patient, including an object of interest, is provided. The apparatus comprises a patient support unit, a processor, and a display. The patient support unit is configured to receive a patient. The processor is configured to receive scout images of the patient acquired in respective positions of the apparatus. Each respective position is represented by a position parameter. The processor is further configured to select at least one iso-centering image from the scout images by geometrical calculation using the position parameter of each scout image and a position parameter representing a present position of the apparatus. The processor is further configured to adapt the appearance of the at least one iso-centering image according to the present position of the apparatus. The display is configured to present the at least one adapted iso-centering image.