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Study on Laser Spot Size Measurement by Scanning-Slit Method Based on Back-Injection Interferometry [PDF]

Optics and Laser Technology
Spot size is an important parameter of the laser, which not only represents the resolution of laser, but is also involved in the calculation of other parameters.
Wei-Hsin Liao, Hay Wong, Mubasher Ali
exaly   +4 more sources

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Spot scanning system for proton radiotherapy

Medical Physics, 1980
In order to provide a uniform and desirable dose distribution over a large radiation field, spot beam scanning is one of the most useful methods. A new spot beam scanning system was constructed for a 70 MeV proton beam. The lateral dose distribution was uniform with ±2.5% for an 18 cm square field.
T, Kanai, K, Kawachi, Y, Kumamoto, H, Ogawa, T, Yamada, H, Matsuzawa, T, Inada   +6 more
openaire   +2 more sources

Spot scanning proton therapy for craniopharyngioma

Practical Radiation Oncology, 2012
Craniopharyngiomas are histologically benign tumors that represent the third most common pediatric brain tumor. Despite their benign appearance, craniopharyngiomas are locally invasive with a propensity for recurrence. Historically craniopharyngiomas were treated with surgery alone.
Mark J, Amsbaugh, X Ronald, Zhu, Matthew, Palmer, Falk, Poenisch, Mary F, McAleer, Anita, Mahajan, David R, Grosshans   +6 more
openaire   +2 more sources

Copying of holograms by spot scanning approach

Applied Optics, 2018
To replicate holograms, contact copying has conventionally been used. In this approach, a photosensitive material is fixed together with a master hologram and illuminated with a coherent beam. This method is simple and enables high-quality copies; however, it requires a large optical setup for large-area holograms.
Makoto, Okui, Koki, Wakunami, Ryutaro, Oi, Yasuyuki, Ichihashi, Boaz Jessie, Jackin, Kenji, Yamamoto   +5 more
openaire   +2 more sources

Spot scanning control system for heavy ion therapy

High Power Laser and Particle Beams, 2014
为了实现重离子治疗肿瘤点扫描,对扫描磁铁进行相应的控制.治疗计划进行剂量与肿瘤适形数据的生成,并传输至点扫描控制器与剂量控制器.同时也向点扫描控制器中存入事例数据,以纳入整个加速器控制时序,等待同步时间事例系统的事例触发.点扫描控制器根据剂量控制器的脉冲控制换点治疗操作以及进行换点治疗的扫描磁铁插值算法平滑处理.剂量控制器对气体电离室前端电子学已经刻度的剂量脉冲进行计数.当达到治疗剂量时,控制法拉第筒来阻挡束流,实现点扫描安全治疗.实验证明在现有的电源与磁铁等设备条件以及束流品质下 ...
刘伍丰 Liu Wufeng, 黄继江 Huang Jijiang, 乔卫民 Qiao Weimin, 敬岚 Jing Lan, 刘楠嶓 Liu Nanbo, 张玮 Zhang Wei, 张世杰 Zhang Shijie   +6 more
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Spot-Scanning-Based Proton Therapy for Extracranial Chordoma

International Journal of Radiation Oncology*Biology*Physics, 2011
To evaluate effectiveness and safety of spot-scanning-based proton-radiotherapy (PT) for extracranial chordomas (ECC).Between 1999-2006, 40 patients with chordoma of C-, T-, and L-spine and sacrum were treated at Paul Scherrer Institute (PSI) with PT using spot-scanning.
Staab, Adrian, Rutz, Hans Peter, Ares, Carmen, Timmermann, Beate, Schneider, Ralf, Bolsi, Alessandra, Albertini, Francesca, Lomax, Antony, Goitein, Gudrun, Hug, Eugen   +9 more
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PROTON SPOT SCANNING RADIOTHERAPY OF SPONTANEOUS CANINE TUMORS

Veterinary Radiology & Ultrasound, 2009
Thirty dogs with spontaneous tumors were irradiated with proton therapy using a novel spot scanning technique to evaluate the safety and efficacy of the system, and to study the acute and late radiation reactions. Nasal tumors, soft tissue sarcomas, and miscellaneous tumors of the head were treated with a median total dose of 52.5 Gy given in 3.5 Gy ...
Mayer-Stankeová, Simona, Fidel, Janean, Wergin, Melanie C., Hauser, Beat, Sumová, Andrea, Goitein, Gudrun, Pedroni, Eros, Lomax, Anthony J., Schneider, Uwe, Blattmann, Hans, Kaser-Hotz, Barbara   +10 more
openaire   +3 more sources

Spot-Scanning Proton Arc (SPArc) Therapy: The First Robust and Delivery-Efficient Spot-Scanning Proton Arc Therapy

International Journal of Radiation Oncology*Biology*Physics, 2016
To present a novel robust and delivery-efficient spot-scanning proton arc (SPArc) therapy technique.A SPArc optimization algorithm was developed that integrates control point resampling, energy layer redistribution, energy layer filtration, and energy layer resampling.
Xuanfeng Ding, Xiaoqiang Li, J. Michele Zhang, Peyman Kabolizadeh, Craig Stevens, Di Yan   +5 more
openaire   +2 more sources

Computed limitations of spot scanning for therapeutic proton beams

International Journal of Bio-Medical Computing, 1988
A calculation depending on the computed fit of a novel mathematical model of the depth dose distribution for a therapeutic proton beam in water and its relevance to a spot scanning system are described. The resulting requirements for lateral and longitudinal precision of the irradiated spots are derived using the standard criterion for allowed dose ...
C V, Levin, R, Gonin, S, Wynchank
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Characteristics of fast beam switching for spot scanning

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2003
Abstract An irradiation method for spot scanning has been developed in order to provide accurate irradiation even for an irregular target shape. In spot scanning irradiation, the beam is turned off while the beam position is shifted to the next spot for precise dose management.
T Furukawa, K Noda, E Urakabe, M Muramatsu, M Kanazawa, K Maeda   +5 more
openaire   +1 more source