SU-E-T-299: Proton Pencil Beam Spot Scanning Phase Space in the IBA System and the Clinical Implications for Superficial Targets

2012 ◽  
Vol 39 (6Part14) ◽  
pp. 3772-3772
Author(s):  
L Lin ◽  
C Ainsley ◽  
D Dolney ◽  
M Closset ◽  
F Dessy ◽  
...  
Keyword(s):  
Phase Space ◽  
Clinical Implications ◽  
Pencil Beam ◽  
Beam Spot ◽  
Spot Scanning

SU-D-304-05: Validation of Low-Dose-Tail Modeling for Proton Pencil Beam Spot Scanning Using a Quality Assurance Test Pattern

2015 ◽  
Vol 42 (6) ◽  
pp. 3208-3209
Author(s):  
L Lin ◽  
S Huang ◽  
M Kang ◽  
T Solberg ◽  
J McDonough ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Low Dose ◽  
Test Pattern ◽  
Pencil Beam ◽  
Beam Spot ◽  
Spot Scanning

Technical Note: Validation of halo modeling for proton pencil beam spot scanning using a quality assurance test pattern

2015 ◽  
Vol 42 (9) ◽  
pp. 5138-5143 ◽  
Author(s):  
Liyong Lin ◽  
Sheng Huang ◽  
Minglei Kang ◽  
Timothy D. Solberg ◽  
James E. McDonough ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Test Pattern ◽  
Technical Note ◽  
Pencil Beam ◽  
Beam Spot ◽  
Spot Scanning

scholarly journals Clinical Implementation of Proton Therapy Using Pencil-Beam Scanning Delivery Combined With Static Apertures

2021 ◽  
Vol 11 ◽  
Author(s):  
Christian Bäumer ◽  
Sandija Plaude ◽  
Dalia Ahmad Khalil ◽  
Dirk Geismar ◽  
Paul-Heinz Kramer ◽  
...  
Keyword(s):  
At Risk ◽  
Proton Therapy ◽  
Target Volume ◽  
Delivery Mode ◽  
Pencil Beam ◽  
Clinical Implementation ◽  
Beam Scanning ◽  
Pencil Beam Scanning ◽  
Spot Scanning ◽  
The Mean

Proton therapy makes use of the favorable depth-dose distribution with its characteristic Bragg peak to spare normal tissue distal of the target volume. A steep dose gradient would be desired in lateral dimensions, too. The widespread spot scanning delivery technique is based, however, on pencil-beams with in-air spot full-widths-at-half-maximum of typically 1 cm or more. This hampers the sparing of organs-at-risk if small-scale structures adjacent to the target volume are concerned. The trimming of spot scanning fields with collimating apertures constitutes a simple measure to increase the transversal dose gradient. The current study describes the clinical implementation of brass apertures in conjunction with the pencil-beam scanning delivery mode at a horizontal, clinical treatment head based on commercial hardware and software components. Furthermore, clinical cases, which comprised craniopharyngiomas, re-irradiations and ocular tumors, were evaluated. The dosimetric benefits of 31 treatment plans using apertures were compared to the corresponding plans without aperture. Furthermore, an overview of the radiation protection aspects is given. Regarding the results, robust optimization considering range and setup uncertainties was combined with apertures. The treatment plan optimizations followed a single-field uniform dose or a restricted multi-field optimization approach. Robustness evaluation was expanded to account for possible deviations of the center of the pencil-beam delivery and the mechanical center of the aperture holder. Supplementary apertures improved the conformity index on average by 15.3%. The volume of the dose gradient surrounding the PTV (evaluated between 80 and 20% dose levels) was decreased on average by 17.6%. The mean dose of the hippocampi could be reduced on average by 2.9 GyRBE. In particular cases the apertures facilitated a sparing of an organ-at-risk, e.g. the eye lens or the brainstem. For six craniopharyngioma cases the inclusion of apertures led to a reduction of the mean dose of 1.5 GyRBE (13%) for the brain and 3.1 GyRBE (16%) for the hippocampi.

scholarly journals A parameter study of pencil beam proton dose distributions for the treatment of ocular melanoma utilizing spot scanning

2009 ◽  
Vol 3 (1) ◽  
pp. 16-22
Author(s):  
Kenneth Sutherland ◽  
Satoshi Miyajima ◽  
Hiroyuki Date ◽  
Hiroki Shirato ◽  
Masayori Ishikawa ◽  
...  
Keyword(s):  
Ocular Melanoma ◽  
Parameter Study ◽  
Pencil Beam ◽  
Dose Distributions ◽  
Spot Scanning ◽  
Beam Proton ◽  
Proton Dose

Using variable beam spot scanning to improve the efficiency of stereolithography process

2013 ◽  
Vol 19 (2) ◽  
pp. 100-110 ◽  
Author(s):  
Cao Yi ◽  
Li Dichen ◽  
Wu Jing
Keyword(s):  
Beam Spot ◽  
Spot Scanning

scholarly journals Impact of range shifter material on proton pencil beam spot characteristics

2015 ◽  
Vol 42 (3) ◽  
pp. 1335-1340 ◽  
Author(s):  
Jiajian Shen ◽  
Wei Liu ◽  
Aman Anand ◽  
Joshua B. Stoker ◽  
Xiaoning Ding ◽  
...  
Keyword(s):  
Pencil Beam ◽  
Beam Spot
Sign in / Sign up

Export Citation Format

Share Document