Charged-Particle Beam Scanning Speed Control for Irradiation Accuracy

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Solution Overview

Problem

Existing charged-particle beam irradiation devices face challenges in accurately controlling the irradiation amount due to unstable beam intensity, making it difficult to modulate the irradiation with high precision, especially in applications like tumor treatment where only the target area should be irradiated.

Innovation Solution

A charged-particle beam irradiation device and method that sets specific scanning speeds at target positions on the scanning line, using a scanning member and control unit to stabilize and adjust the scanning speed for precise control of the irradiation amount, incorporating position/speed feedback control to maintain accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If beam intensity is used to control irradiation amount, then irradiation can be delivered to target areas, but control accuracy deteriorates due to unstable beam intensity

Engineering Contradiction:

Improveirradiation amount control accuracyVSAvoidbeam intensity stability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent changes the control parameter from beam intensity to scanning speed. By controlling the scanning speed of the charged particle beam along the scanning line, the irradiation amount can be precisely controlled without being affected by beam intensity fluctuations. The control amount is now the scanning speed at each position rather than the beam intensity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces feedback control where the actual scanning speed is measured and compared with the target scanning speed, and the scanning control is adjusted based on this feedback to maintain accurate irradiation amount control despite variations in beam intensity or scanning conditions.

Inventive Principle:

Principle #23Feedback

2Manufacturing precision

If scanning speed is controlled to adjust irradiation amount, then irradiation precision improves, but device complexity increases due to speed control mechanisms

Engineering Contradiction:

Improveirradiation amount control accuracyVSAvoidscanning speed control system

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent replaces mechanical intensity modulation systems with an electromagnetic scanning speed control system. Instead of mechanically adjusting beam intensity, the system uses electromagnetic fields to control the scanning speed of the charged particle beam, which is inherently more precise and easier to control in particle beam systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS8294127B2Charged-particle beam irradiation device, charged-particle beam irradiation method, and computer readable medium

Publication Date: 2012.10.23 SUMITOMO HEAVY IND LTD

AI summary

A charged-particle beam irradiation device, which irradiates an object to be irradiated with a charged-particle beam, includes a scanning member that scans the object to be irradiated with the charged-particle beam; an irradiation amount setting unit that sets an irradiation amount of the charged-particle beam at a plurality of target scanning positions on a scanning line of the charged-particle beam with which the scanning member scans the object to be irradiated; and a scanning speed setting unit that sets a target scanning speed of the charged-particle beam at each of the target scanning positions on the basis of the irradiation amount set by the irradiation amount setting unit.