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spine radiosurgery

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https://www.readbyqxmd.com/read/28068232/analysis-of-the-factors-contributing-to-vertebral-compression-fractures-after-spine-stereotactic-radiosurgery
#1
David Boyce-Fappiano, Erinma Elibe, Lonni Schultz, Samuel Ryu, M Salim Siddiqui, Indrin Chetty, Ian Lee, Jack Rock, Benjamin Movsas, Farzan Siddiqui
PURPOSE: To determine our institutional vertebral compression fracture (VCF) rate after spine stereotactic radiosurgery (SRS) and determine contributory factors. METHODS AND MATERIALS: Retrospective analysis from 2001 to 2013 at a single institution was performed. With institutional review board approval, electronic medical records of 1905 vertebral bodies from 791 patients who were treated with SRS for the management of primary or metastatic spinal lesions were reviewed...
February 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28048874/su-f-t-616-comparison-of-different-techniques-using-rtog0631-guidelines-in-spine-sbrt
#2
H Acar, M Cebe, H Mabhouti, G Codel, P Pacaci, E Serin, E Sanli, N Kucuk, E Kucukmorkoc, M Doyuran, D Canoglu, A Altinok, H Caglar
PURPOSE: Stereotactic body radiosurgery (SBRT) for spine metastases involves irradiation using a single high dose fraction. The purpose of this study was to investigate a Hybrid VMAT/IMRT technique which combines volumetric modulated arc therapy (VMAT) and intensity modulated radiation therapy (IMRT) for spine SBRT in terms of its dosimetric quality and treatment efficiency using Radiation Therapy Oncology Group (RTOG) 0631 guidelines. METHODS: 7 fields IMRT, 2 full arcs VMAT and Hybrid VMAT/IMRT were created for ten previously treated patients...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048752/tu-a-brb-02-panel-member
#3
L Ma
: Brain stereotactic radiosurgery (SRS) and spine stereotactic body radiation therapy (SBRT) are commonly treated by a multidisciplinary team of neurosurgeons, radiation oncologists, and medical physicists. However the treatment objectives, constraints, and technical considerations involved can be quite different between the two techniques. In this interactive session an expert panel of speakers will present clinical brain SRS and spine SBRT cases in order to demonstrate real-world considerations for ensuring safe and accurate treatment delivery and to highlight the significant differences in approach for each treatment site...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048618/tu-h-campus-tep1-03-magnetically-focused-proton-irradiation-of-small-volume-radiosurgery-targets
#4
G A McAuley, J M Slater, A J Wroe
PURPOSE: To investigate the use of magnetic focusing for small volume proton radiosurgery targets using a triplet combination of quadrupole rare earth permanent magnet Halbach cylinder assemblies METHODS: Fourteen quadrupole magnets consisting of 24 segments of radiation hard samarium-cobalt adhered into k=3 Halbach cylinders with various field gradients (100 to 250 T/m) were designed and manufactured. Triplet combinations of the magnets were placed on a positioning track on our Gantry 1 treatment table...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048210/su-g-jep1-10-feasibility-of-cyberknife-tracking-using-the-previously-implanted-permanent-brachytherapy-seed-cloud
#5
J Cheung, J Cunha, A Sudhyadhom, C McGuinness, M Roach, M Descovich
PURPOSE: Robotic radiosurgery is a salvage treatment option for patients with recurrent prostate cancer. We explored the feasibility of tracking the bolus of permanent prostate implants (PPI) using image recognition software optimized to track spinal anatomy. METHODS: Forty-five inert iodine seeds were implanted into a gelatin-based prostate phantom. Four superficial gold seeds were inserted to provide ground-truth alignment. A CT scan of the phantom (120 kVp, 1 mm slice thickness) was acquired and a single-energy iterative metal artifact reduction (MAR) algorithm was used to enhance the quality of the DRR used for tracking...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047363/tu-a-brb-00-panel-discussion-sbrt-srs-case-studies-brain-and-spine
#6
David Schlesinger
: Brain stereotactic radiosurgery (SRS) and spine stereotactic body radiation therapy (SBRT) are commonly treated by a multidisciplinary team of neurosurgeons, radiation oncologists, and medical physicists. However the treatment objectives, constraints, and technical considerations involved can be quite different between the two techniques. In this interactive session an expert panel of speakers will present clinical brain SRS and spine SBRT cases in order to demonstrate real-world considerations for ensuring safe and accurate treatment delivery and to highlight the significant differences in approach for each treatment site...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047275/tu-a-brb-03-panel-member
#7
B Winey
: Brain stereotactic radiosurgery (SRS) and spine stereotactic body radiation therapy (SBRT) are commonly treated by a multidisciplinary team of neurosurgeons, radiation oncologists, and medical physicists. However the treatment objectives, constraints, and technical considerations involved can be quite different between the two techniques. In this interactive session an expert panel of speakers will present clinical brain SRS and spine SBRT cases in order to demonstrate real-world considerations for ensuring safe and accurate treatment delivery and to highlight the significant differences in approach for each treatment site...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047056/th-ef-brb-03-significant-cord-and-esophagus-dose-reduction-by-4%C3%AF-non-coplanar-spine-stereotactic-body-radiation-therapy-and-stereotactic-radiosurgery
#8
V Yu, A Tran, D Nguyen, K Woods, M Cao, T Kaprealian, R Chin, D Low, K Sheng
PURPOSE: To demonstrate significant organ-at-risk (OAR) sparing achievable with 4π non-coplanar radiotherapy on spine SBRT and SRS patients. METHODS: Twenty-five stereotactic spine cases previously treated with VMAT (n = 23) or IMRT (n = 2) were included in this study. A computer-aided-design model of a Linac with a 3D-scanned human surface was utilized to determine the feasible beam space throughout the 4π steradian and beam specific source-to-target-distances (STD) required for collision avoidance...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046910/su-f-j-108-tmr-correction-factor-based-online-adaptive-radiotherapy-for-stereotactic-radiosurgery-srs-of-l-spine-tumors-using-cone-beam-ct
#9
I Ghaffar, S Balik, T Zhuang, S Chao, P Xia
PURPOSE: To investigate the feasibility of using TMR ratio correction factors for a fast online adaptive plan to compensate for anatomical changes in stereotactic radiosurgery (SRS) of L-spine tumors. METHODS: Three coplanar treatment plans were made for 11 patients: Uniform (9 IMRT beams equally distributed around the patient); Posterior (IMRT with 9 posterior beams every 20 degree) and VMAT (2 360° arcs). For each patient, the external body and bowel gas were contoured on the planning CT and pre-treatment CBCT...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046696/tu-a-brb-01-panel-member
#10
D Schlesinger
: Brain stereotactic radiosurgery (SRS) and spine stereotactic body radiation therapy (SBRT) are commonly treated by a multidisciplinary team of neurosurgeons, radiation oncologists, and medical physicists. However the treatment objectives, constraints, and technical considerations involved can be quite different between the two techniques. In this interactive session an expert panel of speakers will present clinical brain SRS and spine SBRT cases in order to demonstrate real-world considerations for ensuring safe and accurate treatment delivery and to highlight the significant differences in approach for each treatment site...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046293/su-f-t-631-linear-accelerator-based-frameless-extracranial-radiosurgery-for-treatment-of-occipital-neuralgia-for-non-surgical-candidates
#11
T Denton, J Howe, A Spalding
PURPOSE: Occipital neuralgia is a condition wherein pain is transmitted by the occipital nerves. Non-invasive therapies generally alleviate symptoms; however, persistent or recurring pain may require invasive procedures. Repeated invasive procedures upon failure are considered higher risk and are often contraindicated due to compounding inherent risk. SRS has not been explored as a treatment option largely due to the extracranial nature of the target (as opposed to the similar, more established trigeminal neuralgia), but advances in linear-accelerator frameless-based SRS now present an opportunity to evaluate the novel potential of this modality for this application...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28041329/the-impact-of-histology-and-delivered-dose-on-local-control-of-spinal-metastases-treated-with-stereotactic-radiosurgery
#12
Yoshiya Yamada, Evangelia Katsoulakis, Ilya Laufer, Michael Lovelock, Ori Barzilai, Lily A McLaughlin, Zhigang Zhang, Adam M Schmitt, Daniel S Higginson, Eric Lis, Michael J Zelefsky, James Mechalakos, Mark H Bilsky
OBJECTIVE An analysis of factors contributing to durable radiographic control of spinal metastases was undertaken, drawing from a large single-institution database in an attempt to elucidate indications and dose requirements for successful treatment. METHODS All patients treated at a single institution with stereotactic radiosurgery (SRS) of the spine as first-line therapy were assessed for local progression of the treated site, defined as radiographic enlargement of the treated tumor and/or biopsy-proven evidence of active tumor cells...
January 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28041326/pathological-characteristics-of-spine-metastases-treated-with-high-dose-single-fraction-stereotactic-radiosurgery
#13
Evangelia Katsoulakis, Ilya Laufer, Mark Bilsky, Narasimhan P Agaram, Michael Lovelock, Yoshiya Yamada
OBJECTIVE Spine radiosurgery is increasingly being used to treat spinal metastases. As patients are living longer because of the increasing efficacy of systemic agents, appropriate follow-up and posttreatment management for these patients is critical. Tumor progression after spine radiosurgery is rare; however, vertebral compression fractures are recognized as a more common posttreatment effect. The use of radiographic imaging alone posttreatment may makeit difficult to distinguish tumor progression from postradiation changes such as fibrosis...
January 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28041323/impact-of-cervicothoracic-region-stereotactic-spine-radiosurgery-on-adjacent-organs-at-risk
#14
Mayur Sharma, Elizabeth E Bennett, Gazanfar Rahmathulla, Samuel T Chao, Hilary K Koech, Stephanie N Gregory, Todd Emch, Anthony Magnelli, Antonio Meola, John H Suh, Lilyana Angelov
OBJECTIVE Stereotactic radiosurgery (SRS) of the spine is a conformal method of delivering a high radiation dose to a target in a single or few (usually ≤ 5) fractions with a sharp fall-off outside the target volume. Although efforts have been focused on evaluating spinal cord tolerance when treating spinal column metastases, no study has formally evaluated toxicity to the surrounding organs at risk (OAR), such as the brachial plexus or the oropharynx, when performing SRS in the cervicothoracic region. The aim of this study was to evaluate the radiation dosimetry and the acute and delayed toxicities of SRS on OAR in such patients...
January 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28041321/spine-radiosurgery-lessons-learned-from-the-first-100-treatment-sessions
#15
Ran Harel, Raphael Pfeffer, Daphne Levin, Efrat Shekel, Dan Epstein, Lev Tsvang, Maoz Ben Ayun, Dror Alezra, Leor Zach
OBJECTIVE Local therapy to spine tumors has been shown to be effective in selected cases. Spinal radiosurgery (SRS) is an evolving radiotherapy regimen allowing for noninvasive, highly efficacious local treatment. The learning curve can compromise the results of any newly employed technology and should be studied to minimize its effects. In this paper the first 100 SRSs performed at several medical centers are presented and analyzed for the effects of the learning curve on outcome. METHODS A retrospective analysis was undertaken to evaluate data from patients treated with SRS at Sheba Medical Center and Assuta Medical Centers in the period from September 2011 to February 2016...
January 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28041319/rapid-and-complete-radiological-resolution-of-an-intradural-cervical-cord-lung-cancer-metastasis-treated-with-spinal-stereotactic-radiosurgery-case-report
#16
E Emily Bennett, Camille Berriochoa, Ghaith Habboub, Scott Brigeman, Samuel T Chao, Lilyana Angelov
Stereotactic radiosurgery (SRS) has emerged as a treatment option for patients with spinal metastatic disease. Although SRS has been shown to be successful in a multitude of extradural metastatic tumors causing cord compression, very few cases of intradural treatment have been reported. The authors present a rare case of an intradural extramedullary metastatic small cell lung cancer lesion to the cervical spine resulting in cord compression in an area that had also been extensively pretreated with conventional external-beam radiation therapy...
January 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28041317/stereotactic-radiosurgery-for-intradural-spine-tumors-using-cone-beam-ct-image-guidance
#17
Andrés Monserrate, Benjamin Zussman, Alp Ozpinar, Ajay Niranjan, John C Flickinger, Peter C Gerszten
OBJECTIVE Cone-beam CT (CBCT) image guidance technology has been widely adopted for spine radiosurgery delivery. There is relatively little experience with spine radiosurgery for intradural tumors using CBCT image guidance. This study prospectively evaluated a series of intradural spine tumors treated with radiosurgery. Patient setup accuracy for spine radiosurgery delivery using CBCT image guidance for intradural spine tumors was determined. METHODS Eighty-two patients with intradural tumors were treated and prospectively evaluated...
January 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28041315/anatomic-and-functional-imaging-in-the-diagnosis-of-spine-metastases-and-response-assessment-after-spine-radiosurgery
#18
Moaaz Soliman, Neil K Taunk, Robert E Simons, Joseph R Osborne, Michelle M Kim, Nicholas J Szerlip, Daniel E Spratt
Spine stereotactic radiosurgery (SSRS) has recently emerged as an increasingly effective treatment for spinal metastases. Studies performed over the past decade have examined the role of imaging in the diagnosis of metastases, as well as treatment response following SSRS. In this paper, the authors describe and review the utility of several imaging modalities in the diagnosis of spinal metastases and monitoring of their response to SSRS. Specifically, we review the role of CT, MRI, and positron emission tomography (PET) in their ability to differentiate between osteoblastic and osteolytic lesions, delineation of initial bony pathology, detection of treatment-related changes in bone density and vertebral compression fracture after SSRS, and tumor response to therapy...
January 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/27847573/the-effect-of-perioperative-radiation-therapy-on-spinal-bone-fusion-following-spine-tumor-surgery
#19
Tae-Kyum Kim, Wonik Cho, Sang Min Youn, Ung-Kyu Chang
INTRODUCTION: Perioperative irradiation is often combined with spine tumor surgery. Radiation is known to be detrimental to healing process of bone fusion. We tried to investigate bone fusion rate in spine tumor surgery cases with perioperative radiation therapy (RT) and to analyze significant factors affecting successful bone fusion. METHODS: Study cohort was 33 patients who underwent spinal tumor resection and bone graft surgery combined with perioperative RT...
November 2016: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/27834628/consensus-guidelines-for-postoperative-stereotactic-body-radiation-therapy-for-spinal-metastases-results-of-an-international-survey
#20
Kristin J Redmond, Simon S Lo, Scott G Soltys, Yoshiya Yamada, Igor J Barani, Paul D Brown, Eric L Chang, Peter C Gerszten, Samuel T Chao, Robert J Amdur, Antonio A F De Salles, Matthias Guckenberger, Bin S Teh, Jason Sheehan, Charles R Kersh, Michael G Fehlings, Moon-Jun Sohn, Ung-Kyu Chang, Samuel Ryu, Iris C Gibbs, Arjun Sahgal
OBJECTIVE Although postoperative stereotactic body radiation therapy (SBRT) for spinal metastases is increasingly performed, few guidelines exist for this application. The purpose of this study is to develop consensus guidelines to promote safe and effective treatment for patients with spinal metastases. METHODS Fifteen radiation oncologists and 5 neurosurgeons, representing 19 centers in 4 countries and having a collective experience of more than 1300 postoperative spine SBRT cases, completed a 19-question survey about postoperative spine SBRT practice...
November 11, 2016: Journal of Neurosurgery. Spine
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