MRI Respiratory Display Using Fixed-Center Size Cues
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Solution Overview
Problem
Existing respiratory motion display techniques induce body motions other than respiration due to visual cues that are difficult to see for subjects with poor visual acuity, leading to image quality deterioration in diagnostic imaging.
Innovation Solution
A respiratory motion display device using a processor to generate a rotationally symmetric figure that changes in size with respiratory motion, displayed on a fixed center, with distinct figures for maximum and minimum respiratory values, aiding subjects in recognizing their respiratory motion without moving their visual line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a moving indicator is displayed to match respiratory motion, then the subject can recognize respiratory depth, but the visual line moves and induces body motion other than respiratory motion
Solution Approach 1:
The patent uses a rotationally symmetric figure (circle) that changes in size rather than moving position. This symmetric shape centered on a fixed point allows the subject to maintain a fixed visual line on the center while still perceiving respiratory depth through size changes, eliminating the harmful effect of visual line movement.
Solution Approach 2:
Instead of representing respiratory motion through horizontal or vertical movement (1D translation), the patent uses radial expansion and contraction (size change in 2D space). This dimensional transformation allows the indicator to convey respiratory information without translating position, thus keeping the visual line fixed.
2Illumination intensity
If gradations or light-emitting location are used to indicate respiratory depth, then the subject can see respiratory state, but the visual line moves and induces body motion
Solution Approach 1:
The patent employs a rotationally symmetric circular figure that maintains its centered position while varying in size. This symmetry ensures the visual line remains fixed on the center point, eliminating the harmful effect of visual line movement that occurs with asymmetric indicators like moving light spots or gradations.
Solution Approach 2:
The patent uses brightness or luminance changes of the circular indicator to represent respiratory depth. The indicator's size varies with respiratory phase while its brightness provides additional visual feedback, allowing respiratory state indication without positional movement that would shift the visual line.
3Loss of information
If the first indicator moves upward and downward to match respiration, then respiratory motion is visualized, but subjects with poor visual acuity have difficulty seeing both indicators clearly
Solution Approach 1:
The patent uses a rotationally symmetric figure (circle) centered on a fixed point that changes in size rather than moving position. This symmetric design concentrates visual information in a single location, making it easier for subjects with poor visual acuity to perceive respiratory motion without the complexity of tracking moving indicators.
Solution Approach 2:
The patent combines multiple visual feedback elements (size variation, brightness changes) into a single stationary circular indicator. This merging of information channels at one fixed location eliminates the need to track separate moving indicators, reducing visual demand for subjects with poor acuity.
Data Source
AI summary
Provided are a respiratory motion display device, an operation method thereof, and an image diagnostic system that enable a subject to better recognize a his/her respiratory motion without moving a visual line. In a respiratory motion display device including a processor, a projector that displays a video in an aspect that is visible to a subject during an examination of the subject by an MRI apparatus, and a respiration sensor including a first camera and a second camera that detects a respiratory motion of the subject, the processor is configured to: generate a first figure that is rotationally symmetric about a fixed center and that changes in size in accordance with displacement of a respiratory waveform corresponding to the respiratory motion detected by the respiration sensor; and project the generated first figure onto a ceiling in a bore of the MRI apparatus by the projector as the video.