MRI Bore Motion Display Using Symmetric Visual Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic resonance imaging (MRI) apparatuses are affected by subject movement during data acquisition, leading to reduced image quality, and existing methods to notify subjects of their movement, such as using graphics, can cause unwanted head and body movements due to line of sight adjustments.
Innovation Solution
A body movement display apparatus using a processor and display that shows a rotationally symmetric graphic whose size changes with the subject's movement, allowing the subject to recognize their movement without shifting their gaze, accompanied by additional graphics and warnings to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a graphic display method is used to notify the subject of body movement, then the subject can recognize their movement, but the subject moves their line of sight to check the graphic, which induces unwanted head and body movements
Solution Approach 1:
The patent uses a rotationally symmetric graphic (circle) with an asymmetric internal structure - a vertical line dividing the circle into left and right portions. This allows the graphic to be rotationally symmetric (reducing line of sight movement) while still providing directional information through the asymmetric internal elements that indicate movement direction.
Solution Approach 2:
The patent employs a circular (spheroidal) graphic display that is rotationally symmetric about a fixed center. This circular shape allows the subject to recognize body movement magnitude through the changing size of the circle without needing to move their line of sight, as the rotational symmetry ensures the graphic appears identical from any angular position.
2Manufacturing precision
If the subject is notified of body movement to reduce movement during imaging, then image quality improves, but the notification method causes the subject to move their line of sight, which induces head and body movement
Solution Approach 1:
The patent implements a feedback mechanism where the subject is continuously notified of their body movement magnitude through the graphic display. The graphic shows the detected body movement (from acceleration sensors) and provides visual feedback that helps the subject adjust their posture to reduce movement, thereby improving image quality without causing additional movement through line of sight adjustments.
Solution Approach 2:
The circular, rotationally symmetric graphic allows the subject to monitor their body movement in real-time without moving their line of sight, as the rotational symmetry ensures the graphic appears identical from any angular position. This enables continuous feedback while preventing line of sight-induced head and body movements.
3Object-generated harmful factors
If a rotationally symmetric graphic with fixed center is used, then line of sight movement is suppressed, but the graphic must still convey body movement magnitude information
Solution Approach 1:
The patent uses changes in the graphic's visual properties (such as size, brightness, or color intensity) to encode body movement magnitude information. The rotationally symmetric graphic maintains its fixed center and shape, while variations in these visual attributes convey the magnitude of detected body movement to the subject without requiring line of sight movement.
Solution Approach 2:
The circular graphic with rotational symmetry about a fixed center allows the subject to keep their line of sight stationary while still perceiving changes in body movement magnitude through visual changes in the graphic's appearance, such as size expansion/contraction or brightness variations.
Data Source
AI summary
Provided are a body movement display apparatus, an operation method thereof, and an image diagnostic system that reduce a movement of a line of sight of a subject and enable the subject to satisfactorily recognize his/her own body movement. A body movement display apparatus includes a processor that displays an image in a manner that is visible to a subject during an examination of the subject using an MRI apparatus, and a body movement detection sensor including a first camera and a second camera that detect a body movement of the subject, in which the processor generates a first graphic that is rotationally symmetric about a fixed center and whose size changes according to a magnitude of the body movement of the subject detected by the body movement detection sensor, and projects the generated first graphic into a bore of the MRI apparatus as the image using the projector.