X-ray Diagnostic Apparatus Constant Velocity Fluoroscopy Control

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Solution Overview

Problem

In X-ray diagnostic apparatuses, the need to adjust the imaging system to accommodate imaging ranges wider than the X-ray detector size leads to suspended observations, increased examination time, and higher radiation doses due to manual positioning and continuous fluoroscopy, causing inconvenience and increased burden on both the user and the object being imaged.

Innovation Solution

An X-ray diagnostic apparatus with processing circuitry that controls the movement of the X-ray tube, detector, and variable diaphragm to maintain a constant velocity of the irradiation region relative to the imaging range, allowing for automatic fluoroscopy without manual intervention, thus reducing the need for manual positioning and minimizing radiation exposure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the imaging range is widened beyond the X-ray detector size, then the user can observe a larger area, but the user must suspend observation and perform complicated positioning adjustments

Engineering Contradiction:

Improveimaging rangeVSAvoidpositioning operation

Core Design Contradiction:

Area of stationary objectVSEase of operation

Solution Approach 1:

The system automatically controls the movement of the X-ray tube, detector, and variable diaphragm to maintain the irradiation region within the detector boundaries, eliminating the need for manual positioning operations by the user

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces manual mechanical positioning operations with automated control by processing circuitry that calculates and executes precise movements of the X-ray tube, detector, and diaphragm based on detected position information

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If manual positioning adjustments are performed, then the imaging system can be repositioned, but the examination time increases

Engineering Contradiction:

Improveposition adjustmentVSAvoidexamination time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The fluoroscopy continues without interruption during positioning adjustments as the system automatically coordinates the movement of the X-ray tube, detector, and diaphragm to maintain continuous imaging of the target area

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The processing circuitry pre-calculates and coordinates the sequence of movements for the X-ray tube, detector, and diaphragm before execution, ensuring smooth transitions and minimizing interruption to the imaging process

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If fluoroscopy is continued during positioning, then the user can observe the target continuously, but the radiation dose of the object increases

Engineering Contradiction:

Improvecontinuous observationVSAvoidradiation dose

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The system uses periodic detection and control cycles where the detector detects position information, the processing circuitry calculates required adjustments, and the X-ray tube, detector, and diaphragm are moved in coordinated periodic steps, optimizing the balance between continuous imaging and radiation exposure

Inventive Principle:

Principle #19Periodic action

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

Enables continuous, efficient fluoroscopic imaging of areas wider than the X-ray detector width by maintaining a constant velocity of the irradiation region, reducing examination time and radiation dose, and simplifying the imaging process for the user.

Implementation Method 1

an X-ray tube that emits X-ray beams

Methodology Applied

Scientific EffectX-ray generation: X-Ray

Implementation Method 2

an X-ray detector that detects the X-ray beams

Methodology Applied

Scientific EffectX-ray detection: Photoelectric Effect

Data Source

PatentUS12257095B2X-ray diagnostic apparatus and control method thereof

Publication Date: 2025.03.25 CANON MEDICAL SYST CORP

AI summary

According to one embodiment, an X-ray diagnostic apparatus includes an X-ray tube, an X-ray variable diaphragm, an X-ray detector, and processing circuitry. The X-ray tube irradiates X-rays. The X-ray variable diaphragm limits an irradiation region of the X-rays. The X-ray detector detects the X-rays that have passed through an object. The processing circuitry controls a movement of the X-ray tube, the X-ray detector, and an aperture of the X-ray variable diaphragm such that, when the irradiation region on the X-ray detector moves within an imaging range, a movement velocity of the irradiation region relative to the imaging range is maintained constant.