Medical Image Processing Apparatus Grid Pattern Elimination
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Solution Overview
Problem
Conventional medical image processing methods struggle to accurately eliminate grid patterns with uneven pitches in radiation images, leading to decreased diagnosis efficiency and image quality due to the inability to effectively suppress the grid pattern across the entire detector width.
Innovation Solution
A medical image processing apparatus and method utilizing multiple filters with different filter characteristics applied to specific areas of the radiation image to precisely extract subject information, eliminating grid patterns by matching filter characteristics to the grid pitch and density variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single filter is used to eliminate grid patterns, then the filtering process is simple, but grid patterns with uneven pitches cannot be accurately eliminated across the entire detector width
Solution Approach 1:
The detector width is divided into multiple regions (first region and second region), and different filters are applied to each region. This segmentation allows each filter to be optimized for the specific grid pitch characteristics of its region, thereby accurately eliminating grid patterns with uneven pitches across the entire detector width.
Solution Approach 2:
Different filter characteristics are assigned to different regions of the detector based on the local grid pitch variations. The first filter is designed for the first region with a first grid pitch, while the second filter is designed for the second region with a second grid pitch different from the first. This local quality approach ensures optimal grid pattern elimination in each specific area.
2Measurement precision
If multiple filters with different characteristics are applied to different areas, then grid pattern elimination accuracy is improved, but the device complexity increases
Solution Approach 1:
The filtering system is segmented into multiple independent filter units, each responsible for a specific region. This segmentation allows for modular implementation where each filter can be independently optimized and applied, managing complexity through structured division rather than a single complex filter.
Solution Approach 2:
The filtering system dynamically selects and applies different filters based on the spatial position within the detector width. The system adapts its filtering characteristics to match the local grid pitch variations, achieving high accuracy without requiring a single overly complex static filter design.
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 the reliable elimination of grid patterns with uneven pitches, enhancing image quality and reducing the suppression of high-frequency components, resulting in sharper, high-quality radiation images.
Implementation Method 1
radiation absorption layers made of lead or the like having high radiation absorption rate, and radiation transmittance layers made of aluminum, paper, wood, synthetic resin or the like having low radiation absorption rate are alternately laminated
Implementation Method 2
a radiation image recording/regenerating method with the use of 'photostimulable phosphor', which accumulates and records irradiated radiation energy, and which emits light according to the accumulated-recorded radiation energy when excitation light is irradiated thereto
Data Source
AI summary
A medical image processing apparatus which performs an image processing on a radiation image including a grid pattern obtained by performing radiography with a grid for eliminating scattered radiation, the grid being stationary and located between a subject and a detector for recording subject information, includes: a filtering section for extracting only the subject information from the radiation image by using a plurality of filters having different characteristics from each other, to eliminate the grid pattern.