X-ray CT Detector Signal Bundling for Resolution and Noise
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Solution Overview
Problem
X-ray CT apparatuses face challenges in achieving optimal spatial resolution and signal-to-noise ratio due to limitations in the arrangement and processing of X-ray detecting elements, which affects image quality.
Innovation Solution
The X-ray CT apparatus employs a multi-row detector with a bundling controlling unit that combines signals from multiple detecting elements in various modes (four-element, two-element, and non-combining modes) to adjust spatial resolution and noise resistance, using Data Acquisition Systems (DASs) to process signals from groups of detecting elements and a contactless data transfer system to enhance image data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple X-ray detecting elements are used to improve spatial resolution, then image detail is enhanced, but noise increases and signal-to-noise ratio deteriorates
Solution Approach 1:
The patent combines signals from multiple detecting elements (e.g., four detecting elements in the channel direction and four in the slice direction, totaling 16 elements) into a single bundled signal. This merging approach maintains spatial resolution information while averaging out noise across multiple elements, thereby improving the signal-to-noise ratio without sacrificing image detail.
2Reliability
If signal bundling is applied to improve signal-to-noise ratio, then noise resistance is enhanced, but spatial resolution may be compromised
Solution Approach 1:
The patent segments the detecting elements into specific groups (four elements in channel direction, four in slice direction) and applies different bundling strategies to each segment. This segmented approach allows the system to maintain spatial resolution information through structured grouping while achieving noise reduction through signal bundling within each segment.
3Device complexity
If detecting elements are arranged in a fixed pattern, then device structure is simplified, but adaptability to different imaging requirements is reduced
Solution Approach 1:
The patent implements a dynamic signal bundling system that can adaptively adjust the bundling configuration based on imaging requirements. The system can switch between different bundling modes (e.g., 4x4 element combinations, 2x8 combinations, or other configurations) allowing flexible optimization of spatial resolution and signal-to-noise ratio for different diagnostic scenarios without changing the physical detector arrangement.
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 flexible adjustment of spatial resolution and signal-to-noise ratio, improving image quality by effectively combining signals from multiple detecting elements, thereby enhancing noise resistance and achieving desired image characteristics.
Implementation Method 1
an X-ray tube configured to generate X-rays by rotating around a body axis of a subject
Implementation Method 2
a multi-row detector that includes a plurality of X-ray detecting elements arranged in a channel direction and a slice direction
Data Source
AI summary
An X-ray CT apparatus includes: an X-ray detector in which detecting elements that detect X-rays are arranged in a body-axis direction and a rotation direction; an acquiring unit that acquires signals of the X-rays detected by at least one group of detecting elements which includes a predetermined quantity of detecting elements and in which detecting elements are arranged in at least the rotation direction and that, when reading the signals detected by the detecting elements arranged in the rotation direction from the X-ray detector, sequentially reads the signals at times that vary among the detecting elements arranged in the rotation direction; a correction signal acquiring unit that, in accordance with the signal reading times, acquires correction signals used in a correcting process performed when an image is generated; and an image generating unit that generates the image by applying each correction signal to a corresponding one of the signals.