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Robotized radiosurgery

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https://www.readbyqxmd.com/read/29656632/long-term-survival-in-patients-treated-with-a-robotic-radiosurgical-device-for-liver-metastases
#1
Sebastian Stintzing, Jobst von Einem, Christoph Fueweger, Alfred Haidenberger, Michael Fedorov, Alexander Muavcevic
Purpose: The treatment of liver metastases with local procedures is a fast progressing field. For the most, long-term survival data is missing raising questions with regard to the efficacy of such modalities when compared to surgical resection. Radiosurgery using the CyberKnife device enables the treatment of liver lesions with a single-session approach. Here we present long-term survival data to explore the curative potential of this strategy. Materials and Methods: Patients with oligo-metastatic disease limited to the liver have been treated with single-session or hypo-fractioned radiosurgery in curative intent and prospectively followed until death...
April 16, 2018: Cancer Research and Treatment: Official Journal of Korean Cancer Association
https://www.readbyqxmd.com/read/29621319/dosimetric-impact-of-intra-fraction-prostate-motion-under-a-tumour-tracking-system-in-hypofractionated-robotic-radiosurgery
#2
Yuhei Koike, Iori Sumida, Hirokazu Mizuno, Hiroya Shiomi, Keita Kurosu, Seiichi Ota, Yasuo Yoshioka, Osamu Suzuki, Keisuke Tamari, Kazuhiko Ogawa
For CyberKnife-mediated prostate cancer treatment, a tumour-tracking approach is applied to correct the target location by acquiring X-ray images of implanted fiducial markers intermittently. This study investigated the dosimetric impact of intra-fraction prostate motion during CyberKnife treatment. We retrospectively analyzed 16 patients treated using the CyberKnife (35 Gy delivered in five fractions). Using log files of recorded prostate motion, the intra-fraction prostate motion was simulated. We defined the worst-case intra-fraction prostate motion as the difference between pre- and post-deviation on log files and shifted structure sets according to the corresponding offsets for each beam...
2018: PloS One
https://www.readbyqxmd.com/read/29605528/cyberknife-stereotactic-radiosurgery-and-radiation-therapy-treatment-planning-system
#3
REVIEW
Chuxiong Ding, Cheng B Saw, Robert D Timmerman
CyberKnife is an image-guided stereotactical dose delivery system designed for both focal irradiation and radiation therapy (SRT). Focal irradiation refers the use of many small beams to deliver highly focus dose to a small target region in a few fractions. The system consists of a 6-MV linac mounted to a robotic arm, coupled with a digital x-ray imaging system. The radiation dose is delivered using many beams oriented at a number of defined or nodal positions around the patients. The CyberKnife can be used for both intracranial and extracranial treaments unlike the Gamma Knife which is limited to intracranial cases...
March 28, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29554321/robotic-radiosurgery-for-brain-metastases-diagnosed-with-either-space-or-mprage-sequence-cyber-space-a-single-center-prospective-randomized-trial
#4
Rami A El Shafie, Angela Paul, Denise Bernhardt, Kristin Lang, Thomas Welzel, Tanja Sprave, Adriane Hommertgen, Johannes Krisam, Daniela Schmitt, Sebastian Klüter, Kai Schubert, Christina Klose, Meinhard Kieser, Jürgen Debus, Stefan Rieken
BACKGROUND: Stereotactic radiosurgery (SRS) of brain metastases (BM) is recommended in oligometastatic scenarios as a less toxic treatment alternative to whole-brain radiotherapy. Recent findings support SRS for patients with multiple (>3) BM. Furthermore, advances in MR imaging have facilitated the detection of very small BM, as advances in SRS technology have facilitated the highly conformal and simultaneous treatment of multiple target lesions. OBJECTIVE: To compare efficacy and toxicity of repeated frameless robotic SRS of up to 10 simultaneous BM through a single-center prospective randomized trial...
March 15, 2018: Neurosurgery
https://www.readbyqxmd.com/read/29552780/patient-specific-quality-assurance-for-intracranial-cases-in-robotic-radiosurgery-system
#5
Canan Koksal, Ugur Akbas, Nazmiye Donmez Kesen, Murat Okutan, Hatice Bilge, Gonul Kemikler
PURPOSE: The purpose of this study was to perform pretreatment patient-specific quality assurance (QA) for intracranial irradiation using CyberKnife with an ion chamber. METHODS: Twenty-five intracranial plans created using the ray-tracing algorithm were used for this study. Computed tomography (CT) images of the water-equivalent RW3 slab phantom with PinPoint ionization chamber were acquired with 1-mm slice thickness and transferred to the MultiPlan treatment planning system (TPS)...
January 2018: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/29544504/in-silico-assessment-of-the-dosimetric-quality-of-a-novel-automated-radiation-treatment-planning-strategy-for-linac-based-radiosurgery-of-multiple-brain-metastases-and-a-comparison-with-robotic-methods
#6
Krzysztof Slosarek, Barbara Bekman, Jacek Wendykier, Aleksandra Grządziel, Antonella Fogliata, Luca Cozzi
BACKGROUND: To appraise the dosimetric features and the quality of the treatment plan for radiosurgery of multiple brain metastases optimized with a novel automated engine and to compare with plans optimized for robotic-based delivery. METHODS: A set of 15 patients with multiple brain metastases was selected for this in silico study. The technique under investigation is the recently introduced HyperArc. For all patients, three treatment plans were computed and compared: i: a HyperArc; ii: a standard VMAT; iii) a CyberKnife...
March 15, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29480166/methodology-to-reduce-six-dimensional-patients-positional-shifts-into-a-three-dimensional-linear-shift-and-its-verification-in-frameless-stereotactic-radiotherapy
#7
Biplab Sarkar, Jyotirmoy Ray, Tharmar Ganesh, Arjunan Manikandan, Anusheel Munshi, Sasikumar Rathinamuthu, Harpreet Kaur, Satheeshkumar Anbazhagan, Upendra Kumar Giri, Soumya Roy, Kanan Jassal, Bidhu Kalyan Mohanti
The aim of this article is to derive and verify mathematical formulation for the reduction of the six dimensional (6D) positional inaccuracies of patients (lateral, longitudinal, vertical, pitch, roll and yaw) to three-dimensional (3D) linear shifts. 
 The formulation was mathematically and experimentally tested and verified for 169 stereotactic radiotherapy patients. The mathematical verification involves the comparison of any ( one) of the calculated rotational coordinate with the corresponding value from the 6D shifts obtained by cone beam computed tomography (CBCT)...
February 26, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29429125/cyberknife-robotic-radiosurgery-in-the-multimodal-management-of-acromegaly-patients-with-invasive-macroadenoma-a-single-center-s-experience
#8
Elisa Sala, Justin M Moore, Alvaro Amorin, Hector Martinez, Aprotim C Bhowmik, Layton Lamsam, Steven Chang, Scott G Soltys, Laurence Katznelson, Griffith R Harsh
Surgery is the primary treatment for acromegaly. However, surgery may not be curative of some tumors, particularly invasive macroadenomas. Adjuvant radiation, specifically robotic stereotactic radiosurgery (rSRS), may improve the endocrine outcome. We retrospectively reviewed hormonal and radiological data of 22 acromegalic patients with invasive macroadenomas treated with rSRS at Stanford University Medical Center between 2000 and 2016. Prior to treatment, the tumor's median maximal diameter was 19 mm (2...
February 10, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29376195/efficacy-safety-and-outcome-of-frameless-image-guided-robotic-radiosurgery-for-brain-metastases-after-whole-brain-radiotherapy
#9
Laura-Nanna Lohkamp, Peter Vajkoczy, Volker Budach, Markus Kufeld
Estimating efficacy, safety and outcome of frameless image-guided robotic radiosurgery for the treatment of recurrent brain metastases after whole brain radiotherapy (WBRT). We performed a retrospective single-center analysis including patients with recurrent brain metastases after WBRT, who have been treated with single session radiosurgery, using the CyberKnife® Radiosurgery System (CKRS) (Accuray Inc., CA) between 2011 and 2016. The primary end point was local tumor control, whereas secondary end points were distant tumor control, treatment-related toxicity and overall survival...
January 29, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29363282/to-frame-or-not-to-frame-cone-beam-ct-based-analysis-of-head-immobilization-devices-specific-to-linac-based-stereotactic-radiosurgery-and-radiotherapy
#10
Steven Babic, Young Lee, Mark Ruschin, Fiona Lochray, Alex Lightstone, Eshetu Atenafu, Nic Phan, Todd Mainprize, May Tsao, Hany Soliman, Arjun Sahgal
PURPOSE: Noninvasive frameless systems are increasingly being utilized for head immobilization in stereotactic radiosurgery (SRS). Knowing the head positioning reproducibility of frameless systems and their respective ability to limit intrafractional head motion is important in order to safely perform SRS. The purpose of this study was to evaluate and compare the intrafractional head motion of an invasive frame and a series of frameless systems for single fraction SRS and fractionated/hypofractionated stereotactic radiotherapy (FSRT/HF-SRT)...
March 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29326012/stereotactic-body-radiotherapy-sbrt-for-patients-with-locally-advanced-pancreatic-cancer-a-single-center-experience
#11
Raphaël Jumeau, Guila Delouya, David Roberge, David Donath, Dominic Béliveau-Nadeau, Marie-Pierre Campeau
INTRODUCTION: Despite advances in treatment, notably in systemic therapy, the prognosis of pancreatic adenocarcinoma (PADC) remains dismal. Stereotactic body radiotherapy (SBRT) is an emerging tool in the complex management of PADC. We review outcomes of SBRT for PADC at our institution. METHODS: We reviewed patients treated with SBRT for either unresectable PADC or locally recurrent PADC after surgery. Treatment was delivered using a robotic radiosurgery system with respiratory tracking...
April 2018: Digestive and Liver Disease
https://www.readbyqxmd.com/read/29300187/a-treatment-planning-comparison-between-a-novel-rotating-gamma-system-and-robotic-linear-accelerator-based-intracranial-stereotactic-radiosurgery-radiotherapy
#12
Muhammad M Fareed, Ahmed Eldib, Stephanie E Weiss, Shelly B Hayes, Jinsheng Li, Charlie C-M Ma
To compare the dosimetric parameters of a novel rotating gamma ray system (RGS) with well-established CyberKnife system (CK) for treating malignant brain lesions. RGS has a treatment head of 16 cobalt-60 sources focused to the isocenter, which can rotate 360° on the ring gantry and swing 35° in the superior direction. We compared several dosimetric parameters in 10 patients undergoing brain stereotactic radiosurgery including plan normalization, number of beams and nodes for CK and shots for RGS, collimators used, estimated treatment time, D 2 cm and conformity index (CI) among two modalities...
February 2, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29152420/treatment-planning-for-self-shielded-radiosurgery
#13
John R Adler, Achim Schweikard, Younes Achkire, Oliver Blanck, Mohan Bodduluri, Lijun Ma, Hui Zhang
A five degree of freedom, robotic, radiosurgical system dedicated to the brain is currently under development. In the proposed design, the machine is entirely self-shielded. The main advantage of a self-shielded system is the simplification of the system's installation, which can reduce the cost of radiosurgery. In this way, more patients can benefit from this minimally invasive and highly effective type of procedure. For technical reasons, space inside the shielded region is limited, which leads to constraints on the design...
September 8, 2017: Curēus
https://www.readbyqxmd.com/read/29131807/towards-frameless-maskless-srs-through-real-time-6dof-robotic-motion-compensation
#14
Andrew H Belcher, Xinmin Liu, Steven Chmura, Kamil Yenice, Rodney D Wiersma
Stereotactic radiosurgery (SRS) uses precise dose placement to treat conditions of the CNS. Frame-based SRS uses a metal head ring fixed to the patient's skull to provide high treatment accuracy, but patient comfort and clinical workflow may suffer. Frameless SRS, while potentially more convenient, may increase uncertainty of treatment accuracy and be physiologically confining to some patients. By incorporating highly precise robotics and advanced software algorithms into frameless treatments, we present a novel frameless and maskless SRS system where a robot provides real-time 6DoF head motion stabilization allowing positional accuracies to match or exceed those of traditional frame-based SRS...
November 13, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29105011/modern-robot-assisted-radiosurgery-of-cerebral-angiomas-own-experiences-system-comparisons-and-comprehensive-literature-overview
#15
Thomas Feutren, Andres Huertas, Julia Salleron, René Anxionnat, Serge Bracard, Olivier Klein, Didier Peiffert, Valérie Bernier-Chastagner
Cerebral arteriovenous malformations (AVMs) are rare vascular lesions potentially responsible for substantial neurological morbidity and mortality. Over the past four decades, radiosurgery has become a valid therapeutic option for many patients with small intracranial AVMs, but reports describing the use of robotic stereotactic radiosurgery (SRS) are rare. The purposes of this study are to describe the efficacy and toxicity of robotic SRS for AVMs and to review the literature. The reports of 48 consecutive patients treated with SRS were reviewed...
November 5, 2017: Neurosurgical Review
https://www.readbyqxmd.com/read/29065601/development-of-a-prototype-robotic-system-for-radiosurgery-with-upper-hemispherical-workspace
#16
Sun Young Noh, Kyungmin Jeong, Yong-Chil Seo, Chang-Hoi Kim, Jongwon Park, Yoo Rark Choi, Sung Uk Lee, Yeong-Geol Bae, Seungho Kim
This paper introduces a specialized robotic system under development for radiosurgery using a small-sized linear accelerator. The robotic system is a 5-DOF manipulator that can be installed above a patient to make an upper hemispherical workspace centered in a target point. In order to determine the optimal lengths of the link, we consider the requirements for the workspace of a linear accelerator for radiosurgery. A more suitable kinematic structure than conventional industrial manipulators is proposed, and the kinematic analysis is also provided...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29064585/the-dosimetric-impact-of-the-prescription-isodose-line-idl-on-the-quality-of-robotic-stereotactic-radiosurgery-srs-plans
#17
Qianyi Xu, Jiajin Fan, Jimm Grimm, Tamara LaCouture, Sucha Asbell, Joo Han Park, Gregory Kubicek
PURPOSE: There is no consensus on the optimal prescription isodose line (IDL) in CyberKnife (CK) SRS. We designed a strategy to search for optimal CK plans at different levels of IDLs and investigated the dosimetric impact on the quality of CK plans. METHODS AND MATERIALS: The retrospective study consisted of 13 CK patients with 16 brain tumors. The mean volume and size of the tumors was 9.7 ± 10.4 cc and 30.3 ± 10.9 mm, respectively. Four shells were created at distances of 2-3 mm to 60 mm from the target...
December 2017: Medical Physics
https://www.readbyqxmd.com/read/28983373/rectal-toxicity-after-extremely-hypofractionated-radiotherapy-using-a-non-isocentric-robotic-radiosurgery-system-for-early-stage-prostate-cancer
#18
Naoto Shikama, Yu Kumazaki, Kazunari Miyazawa, Keiji Nihei, Shinpei Hashimoto, Nobuhiro Tsukamoto
BACKGROUND: The aim of the study was to evaluate toxicity after extremely hypofractionated radiotherapy (EHF-RT) using a non-isocentric robotic radiosurgery system for early stage prostate cancer. METHODS: Eligibility criteria of this feasibility study were 50 - 84 years old, and low-risk to intermediate-risk disease. The prescribed dose to the iso-dose line of 95% of planning target volume was 35 Gy in five fractions over 2 weeks. The primary endpoint was the incidence of ≥ grade 2 acute toxicity which indicated symptoms requiring medications...
December 2016: World Journal of Oncology
https://www.readbyqxmd.com/read/28917250/emerging-technologies-in-stereotactic-body-radiotherapy
#19
Lijun Ma, Lei Wang, Chia-Lin Tseng, Arjun Sahgal
Stereotactic body radiation therapy (SBRT) stems from the initial developments of intra-cranial stereotactic radiosurgery (SRS). Despite similarity in their names and clinical goals of delivering a sufficiently high tumoricidal dose, maximal sparing of the surrounding normal tissues and a short treatment course, SBRT technologies have transformed from the early days of body frame-based treatments with X-ray verification to primarily image-guided procedures with cone-beam CT or stereoscopic X-ray systems and non-rigid body immo-bilization...
September 2017: Chinese Clinical Oncology
https://www.readbyqxmd.com/read/28856078/participating-in-an-international-stereotactic-radiotherapy-patient-registry-the-establishment-of-data-collection-pathways
#20
Aylin Yahya, Eva Arneric, Elizabeth Kernutt, Fiona Baldacchino, Claire Haworth, Mary-Anne Kedda, Colin Tang, Sean Bydder, Tammy Corica
Aim To describe data collection pathways and practical challenges experienced by an academic comprehensive cancer centre aiming to record clinical data for patients being treated with a novel radiotherapy treatment modality. Methods Various options to capture data from all patients treated with the CyberKnife Robotic Radiosurgery System at Sir Charles Gairdner Hospital (SCGH) in Western Australia were explored. An international multicenter web-based secure database established and maintained by the Radiosurgery Society the RSSearch® Patient Registry was selected...
June 29, 2017: Curēus
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