Treatment Planning for Stereotactic Radiosurgery with Photon Beams

2003 ◽  
Vol 2 (2) ◽  
pp. 93-104 ◽  
Author(s):  
Cedric Yu ◽  
David Shepard
Keyword(s):  
Stereotactic Radiosurgery ◽  
Treatment Planning ◽  
Photon Beams ◽  
Stereotactic Techniques ◽  
Multileaf Collimators ◽  
Treatment Techniques ◽  
X Band ◽  
Planning Methods ◽  
Technological Developments ◽  
Planning Strategies

Stereotactic Radiosurgery (SRS) has evolved as a unique discipline that combines aspects of both surgery and radiation oncology. Technological developments in the past few decades have provided a wide array of treatment techniques, including (i) the Gamma KnifeTM; (ii) Linac-based stereotactic techniques using circular collimators or using micro multileaf collimators (mMLCs); (iii) the Cyber KnifeTM, using an x-band linac mounted on a robotic arm; and (iv) serial and spiral tomotherapy. This paper provides a review of the treatment planning methods for stereotactic radiosurgery. Because of the differences in planning strategies used for each SRS technique, this paper will provide both a general review of the pre-requisites and common features of SRS treatment planning and the planning techniques specific to each of the SRS techniques.

Commissioning 6 MV photon beams of a stereotactic radiosurgery system for Monte Carlo treatment planning

2003 ◽  
Vol 30 (12) ◽  
pp. 3124-3134 ◽  
Author(s):  
Jun Deng ◽  
C.-M. Ma ◽  
Jenny Hai ◽  
Ravinder Nath
Keyword(s):  
Monte Carlo ◽  
Stereotactic Radiosurgery ◽  
Treatment Planning ◽  
Photon Beams

scholarly journals A hybrid automated treatment planning solution for esophageal cancer

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Chifang Ling ◽  
Xu Han ◽  
Peng Zhai ◽  
Hao Xu ◽  
Jiayan Chen ◽  
...  
Keyword(s):  
Esophageal Cancer ◽  
Treatment Planning ◽  
Treatment Plan ◽  
Estimation Model ◽  
Knowledge Based ◽  
Plan Optimization ◽  
Dose Volume ◽  
Knowledge Based Planning ◽  
Planning Methods ◽  
Planning Strategies

Abstract Objective This study aims to investigate a hybrid automated treatment planning (HAP) solution that combines knowledge-based planning (KBP) and script-based planning for esophageal cancer. Methods In order to fully investigate the advantages of HAP, three planning strategies were implemented in the present study: HAP, KBP, and full manual planning. Each method was applied to 20 patients. For HAP and KBP, the objective functions for plan optimization were generated from a dose–volume histogram (DVH) estimation model, which was based on 70 esophageal patients. Script-based automated planning was used for HAP, while the regular IMRT inverse planning method was used for KBP. For full manual planning, clinical standards were applied to create the plans. Paired t-tests were performed to compare the differences in dose-volume indices among the three planning methods. Results Among the three planning strategies, HAP exhibited the best performance in all dose-volume indices, except for PTV dose homogeneity and lung V5. PTV conformity and spinal cord sparing were significantly improved in HAP (P < 0.001). Compared to KBP, HAP improved all indices, except for lung V5. Furthermore, the OAR sparing and target coverage between HAP and full manual planning were similar. Moreover, HAP had the shortest average planning time (57 min), when compared to KBP (63 min) and full manual planning (118 min). Conclusion HAP is an effective planning strategy for obtaining a high quality treatment plan for esophageal cancer.

scholarly journals A Hard Copper Open X-Band RF Accelerating Structure Made by Two Halves

Instruments ◽  
2022 ◽  
Vol 6 (1) ◽  
pp. 5
Author(s):  
Bruno Spataro ◽  
Mostafa Behtouei ◽  
Fabio Cardelli ◽  
Martina Carillo ◽  
Valery Dolgashev ◽  
...  
Keyword(s):  
X Band ◽  
Accelerating Structure ◽  
Technological Developments

This communication focuses on the technological developments aiming to show the viability of novel welding techniques [...]

scholarly journals Stereotactic diffusion tensor imaging tractography for Gamma Knife radiosurgery

2016 ◽  
Vol 125 (Supplement_1) ◽  
pp. 139-146 ◽  
Author(s):  
Cormac G. Gavin ◽  
H. Ian Sabin
Keyword(s):  
Diffusion Tensor Imaging ◽  
White Matter ◽  
Stereotactic Radiosurgery ◽  
Treatment Planning ◽  
Vestibular Schwannoma ◽  
Diffusion Tensor ◽  
Gamma Knife Radiosurgery ◽  
Optic Radiation ◽  
Arcuate Fasciculus ◽  
Stereotactic Frame

OBJECTIVEThe integration of modern neuroimaging into treatment planning has increased the therapeutic potential and safety of stereotactic radiosurgery. The authors report their method of integrating stereotactic diffusion tensor imaging (DTI) tractography into conventional treatment planning for Gamma Knife radiosurgery (GKRS). The aim of this study was to demonstrate the feasibility of this technique and to address some of the technical limitations of previously reported techniques.METHODSTwenty patients who underwent GKRS composed the study cohort. They consisted of 1 initial test case (a patient with a vestibular schwannoma), 5 patients with arteriovenous malformations, 9 patients with cerebral metastases, 1 patient with parasagittal meningioma, and 4 patients with vestibular schwannoma. DT images were obtained at the time of standard GKRS protocol MRI (T1 and T2 weighted) for treatment, with the patient's head secured by a Leksell stereotactic frame. All studies were performed using a 1.5-T magnet with a single-channel head coil. DTI was performed with diffusion gradients in 32 directions and coregistered with the volumetric T1-weighted study. DTI postprocessing by means of commercially available software allowed tensor computation and the creation of directionally encoded color–, apparent diffusion coefficient–, and fractional anisotropy–mapped sequences. In addition, the software allowed visualized critical tracts to be exported as a structural volume and integrated into GammaPlan as an “organ at risk” during shot planning. Combined images were transferred to GammaPlan and integrated into treatment planning.RESULTSStereotactic DT images were successfully acquired in all patients, with generation of correct directionally encoded color images. Tract generation with the software was straightforward and reproducible, particularly for axial tracts such as the optic radiation and the arcuate fasciculus. Corticospinal tract visualization was hampered by some artifacts from the base of the stereotactic frame, but this was overcome by a combination of frame/MRI volume adjustment and DTI seeding parameters. Coregistration of the DTI series with the T1-weighted treatment volume at the time of imaging was essential for the generation of correct tensor data. All patients with the exception of the vestibular schwannoma cases had treatment pathology in the vicinity of eloquent tracts and/or the cortex. No new neurological deficits due to radiation were recorded at the short-term follow-up.CONCLUSIONSRecent reports in the medical literature have suggested that white matter tracts (particularly the optic radiation and arcuate fasciculus) are more vulnerable to radiation during stereotactic radiosurgery than previously thought. Integration of stereotactic tractography into GKRS represents a promising tool for preventing GKRS complications by reduction in radiation doses to functional organs at risk, including critical cortical areas and subcortical white matter tracts.

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