X-ray CT Apparatus Displacement Correction for Puncture Guidance
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Solution Overview
Problem
Misalignments between MPR images created during CT fluoroscopy and planned images from puncturing plans occur due to posture changes of the subject, leading to difficulties in accurate and efficient puncturing procedures.
Innovation Solution
The X-ray CT apparatus calculates and adjusts for displacement between initial and subsequent scan positions using an image processor and display controller to create a new planned image, ensuring alignment and accuracy during puncturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CT fluoroscopy is performed to obtain real-time images during puncturing, then the ability to verify needle position and guide puncturing is improved, but misalignments occur between MPR images and planned images due to subject posture changes
Solution Approach 1:
The system performs repeated CT fluoroscopy scanning during puncturing to obtain updated volume data, calculates displacement between initial and current subject positions, and uses this feedback to correct the planned passage display. This closed-loop feedback mechanism ensures the displayed planned passage remains aligned with the actual subject position despite posture changes.
Solution Approach 2:
The system performs preliminary CT scanning to create initial volume data and planned passage before puncturing begins. This preliminary action establishes the baseline reference that will be used for subsequent displacement calculations and image correction during the puncturing procedure.
2Reliability
If repeated CT fluoroscopy scanning is performed during puncturing, then real-time verification capability is improved, but scanning time and processing time increase
Solution Approach 1:
The system automatically calculates displacement between initial and current volume data and performs corrective processing without requiring manual intervention. This self-service automation reduces the time operators would otherwise spend on manual alignment and verification, making the repeated scanning process more efficient.
3Manufacturing precision
If manual alignment of MPR images and planned images is performed, then image accuracy can be improved, but operational complexity and time consumption increase
Solution Approach 1:
The system replaces manual mechanical alignment operations with automated computational processing. The image processor automatically calculates displacement based on volume data comparison and applies corrective transformations to the planned passage display, eliminating the need for manual image registration and simplifying the operator's task.
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 solution enables accurate and efficient puncturing by aligning the puncture needle's position with the planned trajectory, reducing errors and improving procedural efficiency.
Implementation Method 1
the X-ray CT apparatus exposes X-rays to a subject multiple times from different directions, detects the X-rays transmitted through the subject by an X-ray detector
Data Source
AI summary
It is to provide an X-ray CT apparatus, which can realize accuracy and efficiency in a puncturing work. An X-ray CT apparatus 1 creates volume data based on a result obtained by X-ray scanning of a subject E for medical practice with a puncture needle. The X-ray CT apparatus 1 comprises an image processor 42, and a display controller 44. The image processor 42 creates an image of the subject E obtained by scanning, which is performed in a state that the puncture needle is being inserted to the subject E, based on the volume data. The image processor 42 also creates a new planned image, based on displacement between a position of a specific region on an image based on second volume data and a position of a corresponding specific region in a first planned image, which is created based on a first volume data in advance and includes an image I of an insert passage for the puncture needle with respect to the subject E. The display controller 44 allows a display 46 to display a new planned image.