MRI Bed Frame Positioning Control for Bore Protrusion

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Solution Overview

Problem

Existing medical image diagnosis apparatuses face challenges in accurately correcting the position of the table top and support frame within a bore to prevent protrusion during movement, leading to bending and vibration issues that affect image quality.

Innovation Solution

A medical image diagnosis apparatus with a gantry, first frame, second frame, and movement control circuitry, where the first frame supports the table top for longitudinal movement towards the gantry, and the second frame supports the first frame for vertical movement, using an X link and base to correct positional changes and reduce protrusion through precise control of the gantry/bed driving system.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the table top and support frame move forward and backward while moving up and down, then the table top can be positioned within the bore, but the table top inevitably protrudes during positioning

Engineering Contradiction:

Improvepositioning accuracyVSAvoidprotrusion occurrence

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The system performs preliminary positioning in the forward-backward direction before moving up and down. The control unit calculates the required forward-backward adjustment based on the vertical movement distance, and executes this adjustment beforehand to prevent protrusion during the positioning process

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses detection units to monitor the actual positions of the table top and support frame, feeds this information back to the control unit, which then calculates and adjusts the forward-backward position to compensate for protrusion and achieve accurate positioning

Inventive Principle:

Principle #23Feedback

2Manufacturing precision

If movement information in directions other than forward-backward is converted to correct position in forward-backward direction, then positioning can be attempted, but the position cannot be corrected accurately

Engineering Contradiction:

Improveposition correction accuracyVSAvoidconversion process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The system replaces complex mechanical conversion mechanisms with a computational approach. The control unit uses detection information and calculated relationships to directly determine the required forward-backward position adjustment, eliminating the need for physical conversion mechanisms and achieving high precision through calculation rather than mechanical transformation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS10548541B2Medical image diagnosis apparatus and bed apparatus

Publication Date: 2020.02.04 CANON MEDICAL SYST CORP

AI summary

According to one embodiment, a medical image diagnosis apparatus includes a gantry, a first frame, a second frame, a support base, and control circuitry. The first frame supports a table top. The table top is movable in a longitudinal direction of the table top. The second frame supports the first frame. The first frame is movable in the longitudinal direction. The support base is equipped with an X link that supports the second frame. The second frame is movable in a direction vertical to a floor surface. The control circuitry moves the first frame in the longitudinal direction based on operation information of a drive shaft of the support base to correct a change in position of the first frame in the longitudinal direction in accordance with movement of the second frame in the vertical direction.