A heuristic approach for actuator layout designs in deformable mirror devices based on current value optimization

Yamaki, Yuto; Sato, Yuki; Izui, Kazuhiro; Yamada, Takayuki; Nishiwaki, Shinji; Hirai, Yoshikazu; Tabata, Osamu

doi:10.1007/s00158-018-1968-5

Cited by 9 publications

(2 citation statements)

References 26 publications

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“…On the other hand, Yamaki et al (2018) proposed an actuator layout design method for deformable mirrors in fundus imaging modality. Their method can obtain the optimal layout of a minimum number of actuators while keeping the error of mirror surface deformation small enough.…”

Section: Introductionmentioning

confidence: 99%

Layout optimization of the beam spot locations scanned by electromagnets in particle beam therapy

Sakamoto

NAGASHIMA

Sato

et al. 2022

Mechanical Engineering Journal

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This paper presents a layout optimization method of the spot locations of pencil beam scanning for particle beam cancer therapy. With the pencil beam scanning technique, the particle beam is scanned from spot to spot in the tumor by using scanning magnets. To provide clinically ideal dose distributions and less-invasive treatment to the patients, both the spot locations and the number of particles given to each spot should be optimized. However, the spot layout is fixed with a lattice pattern in many prior studies. We propose the optimization method to derive the non-lattice spot layout to realize an acceptable dose distribution with a reduced number of spots. With the proposed method, a large enough number of spots were located densely at the initial state, and then the spots with the smallest contribution were removed one by one through iterations. The number of particles given to each spot was determined by solving a quadratic problem. Furthermore, we also propose the idea to accelerate the optimization process by simultaneously removing multiple spots. The algorithm was confirmed by numerical examples of both two-dimensional and three-dimensional cases. The dose quality with the optimized spot layout was better than that with the conventional lattice spot patterns, with all tested cases. In the optimized spot layout, the spots were located on the closed lines which were concentric to the target contour. We also confirmed the proposed method of multiple-remotion can accelerate the optimization process without violating the dose quality.

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Section: Introductionmentioning

confidence: 99%

Layout optimization of the beam spot locations scanned by electromagnets in particle beam therapy

Sakamoto

NAGASHIMA

Sato

et al. 2022

Mechanical Engineering Journal

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“…Although the literature abounds with many theoretical and applicable studies on this topic, the actuator placement problem for adaptive optics systems is rarely studied. Energy consumption-based optimization is studied via the heuristic way in Yamaki et al (2018). However, the dynamics of the DM and the aberrations are not taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Optimal actuator placement in adaptive optics systems

Altıner

Erol

Delibaşı

2021

Journal of Vibration and Control

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Adaptive optics systems are powerful tools that are implemented to degrade the effects of wavefront aberrations. In this article, the optimal actuator placement problem is addressed for the improvement of disturbance attenuation capability of adaptive optics systems due to the fact that actuator placement is directly related to the enhancement of system performance. For this purpose, the linear-quadratic cost function is chosen, so that optimized actuator layouts can be specialized according to the type of wavefront aberrations. It is then considered as a convex optimization problem, and the cost function is formulated for the disturbance attenuation case. The success of the presented method is demonstrated by simulation results.

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Integrated structural-electromagnetic optimization of cable mesh reflectors considering pattern degradation for random structural errors

Zhang

Duan

2020

Struct Multidisc Optim

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A heuristic approach for actuator layout designs in deformable mirror devices based on current value optimization

Cited by 9 publications

References 26 publications

Layout optimization of the beam spot locations scanned by electromagnets in particle beam therapy

Layout optimization of the beam spot locations scanned by electromagnets in particle beam therapy

Optimal actuator placement in adaptive optics systems

Integrated structural-electromagnetic optimization of cable mesh reflectors considering pattern degradation for random structural errors

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