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Stereotactic radiation

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https://www.readbyqxmd.com/read/29143275/increasing-time-to-postoperative-stereotactic-radiation-therapy-for-patients-with-resected-brain-metastases-investigating-clinical-outcomes-and-identifying-predictors-associated-with-time-to-initiation
#1
Mehran B Yusuf, Mark J Amsbaugh, Eric Burton, Megan Nelson, Brian Williams, Maria Koutourousiou, Haring Nauta, Shiao Woo
We sought to determine the impact of time to initiation (TTI) of post-operative radiosurgery on clinical outcomes for patients with resected brain metastases and to identify predictors associated with TTI. All patients with resected brain metastases treated with postoperative SRS or fractionated stereotactic radiation therapy (fSRT) from 2012 to 2016 at a single institution were reviewed. TTI was defined as the interval from resection to first day of radiosurgery. Receiver operating characteristic (ROC) curves were used to identify an optimal threshold for TTI with respect to local failure (LF)...
November 15, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29140463/anatomic-investigation-of-the-trajectory-for-stereotactic-laser-amygdalohippocampectomy
#2
Vanessa M Holanda, Abuzer Gungor, Serhat Baydin, Erik H Middlebrooks, Shabbar F Danish
BACKGROUND: Magnetic resonance imaging-guided laser interstitial thermal therapy (LITT) has emerged as a promising treatment for mesial temporal lobe epilepsy. Surgeons must understand the relevant anatomy that is traversed by the catheter and affected by ablation. OBJECTIVE: To study the anatomic structures crossed by the LITT catheter until it reaches the amygdala. METHODS: Three human cadaveric heads were implanted with catheters using a frameless stereotactic technique...
November 11, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29139010/radiobiology-and-radiotherapy-of-brain-metastases
#3
Anuradha Thiagarajan, Yoshiya Yamada
Brain metastases are the most common intracranial tumors in adults, accounting for more than 50% of all such cases. The approach to and management of brain metastases have evolved significantly in recent years due to several reasons. These include advances in neurosurgical and radiotherapeutic techniques, improved systemic therapy options offering better systemic and intracranial disease control and prolongation of survival as a result of these improvements, making side-effects of proposed therapies (e.g. neurocognitive decline from whole brain radiotherapy) an important consideration...
November 14, 2017: Clinical & Experimental Metastasis
https://www.readbyqxmd.com/read/29131131/gamma-knife-stereotactic-radiosurgery-for-the-treatment-of-primary-and-metastatic-ocular-malignancies
#4
Andrea L H Arnett, Margaret M Reynolds, Jose S Pulido, Ian F Parney, Nadia N Laack
BACKGROUND: Gamma knife radiosurgery (GKR) can be used for precise targeting of malignant lesions of the CNS when brachytherapy is not an appropriate option. OBJECTIVES: This study reports treatment technique, efficacy, and radiation-induced adverse effects in patients with primary and metastatic ocular lesions treated with Leksell GKR. METHODS: A retrospective, single-institution review was conducted of 28 patients with primary or metastatic ocular disease, treated from 2000 to 2014...
November 4, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/29128934/radiobiological-analysis-of-stereotactic-body-radiation-therapy-for-an-evidence-based-planning-target-volume-of-the-lung-using-multiphase-ct-images-obtained-with-a-pneumatic-abdominal-compression-apparatus-a-case-study
#5
Arun Chairmadurai, Harish Chandra Goel, Sandeep Kumar Jain, Pawan Kumar
This study evaluated the efficiency of stereotactic body radiation therapy of lung (SBRT-Lung) in generating a treatment volume using conventional multiple-phase three-dimensional computed tomography (3D-CT) of a patient immobilized with pneumatic abdominal compression. The institutional protocol for SBRT-Lung using the RapidArc technique relied on a planning target volume (PTV) delineated using 3D-CT and accounted for linear and angular displacement of the tumor during respiratory movements. The efficiency of the institutional protocol was compared with that of a conventional method for PTV delineation based on radiobiological estimates, such as tumor control probability (TCP) and normal tissue complication probability (NTCP), evaluated using dose-volume parameters...
November 11, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/29128147/using-indocyanine-green-extraction-to-predict-liver-function-after-stereotactic-body-radiation-therapy-for-hepatocellular-carcinoma
#6
Krithika Suresh, Dawn Owen, Latifa Bazzi, William Jackson, Randall K Ten Haken, Kyle Cuneo, Mary Feng, Theodore S Lawrence, Matthew J Schipper
PURPOSE: To test the hypothesis that mid-treatment measures of the retention of indocyanine green after 15 minutes (ICGR15) would improve the prediction of posttreatment liver function in the setting of hepatocellular carcinoma. METHODS AND MATERIALS: Between 2006 and 2015, 144 patients with hepatocellular carcinoma received 175 courses of stereotactic body radiation therapy (SBRT). Patient data, such as age, sex, portal vein thrombosis, cirrhosis, Child-Pugh (CP) score, prior liver-directed therapies, and liver function tests, including albumin-bilirubin (ALBI) and ICG clearance, and dosimetric data, such as tumor volume and radiation dose, were collected...
September 22, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29126142/stereotactic-radiosurgery-in-the-management-of-limited-1-4-brain-metasteses-systematic-review-and-international-stereotactic-radiosurgery-society-practice-guideline
#7
Samuel T Chao, Antonio De Salles, Motohiro Hayashi, Marc Levivier, Lijun Ma, Roberto Martinez, Ian Paddick, Jean Régis, Samuel Ryu, Ben J Slotman, Arjun Sahgal
BACKGROUND: Guidelines regarding stereotactic radiosurgery (SRS) for brain metastases are missing recently published evidence. OBJECTIVE: To conduct a systematic review and provide an objective summary of publications regarding SRS in managing patients with 1 to 4 brain metastases. METHODS: Using Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines, a systematic review was conducted using PubMed and Medline up to November 2016...
November 3, 2017: Neurosurgery
https://www.readbyqxmd.com/read/29125412/stereotactic-radiosurgery-for-jugular-foramen-schwannomas-an-international-multicenter-study
#8
Hideyuki Kano, Antonio Meola, Huai-Che Yang, Wan-Yuo Guo, Roberto Martínez-Alvarez, Nuria Martínez-Moreno, Dusan Urgosik, Roman Liscak, Or Cohen-Inbar, Jason Sheehan, John Y K Lee, Mahmoud Abbassy, Gene H Barnett, David Mathieu, Douglas Kondziolka, L Dade Lunsford
OBJECTIVE For some jugular foramen schwannomas (JFSs), complete resection is possible but may be associated with significant morbidity. Stereotactic radiosurgery (SRS) is a minimally invasive alternative or adjunct to microsurgery for JFSs. The authors reviewed clinical and imaging outcomes of SRS for patients with these tumors. METHODS Nine participating centers of the International Gamma Knife Research Foundation identified 92 patients who underwent SRS between 1990 and 2013. Forty-one patients had prior subtotal microsurgical resection...
November 10, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29125025/choroid-plexus-avm-with-anomalous-origin-of-the-capsulothalamic-artery-a-case-report
#9
Shigeru Yamauchi, Taichiro Kawakami, Keiji Murata, Tomoya Ishiguro, Hidetoshi Ikeda, Akimasa Nishio
Background and importance Traditionally, it has been believed that the plexal segment of the anterior choroidal artery (AChoA) can be sacrificed safely. Here, we present a case of choroid plexus arteriovenous malformation (AVM) in which the capsulothalamic artery originated from distal plexal segment of the AChoA. Clinical presentation A 45-year-old man was diagnosed with arteriovenous malformation involving the left inferior horn in screening MRI. Preceding stereotactic radiosurgery, transarterial target embolization was performed...
January 1, 2017: Interventional Neuroradiology
https://www.readbyqxmd.com/read/29124649/angiotensin-receptor-blockade-a-novel-approach-for-symptomatic-radiation-necrosis-after-stereotactic-radiosurgery
#10
Mudit Chowdhary, Derick Okwan-Duodu, Jeffrey M Switchenko, Robert H Press, Jaymin Jhaveri, Zachary S Buchwald, Jim Zhong, Bhavana V Chapman, Ranjit S Bindra, Joseph N Contessa, Henry S Park, James B Yu, Roy H Decker, Jeffrey J Olson, Nelson M Oyesiku, Ross A Abrams, Hui-Kuo G Shu, Walter J Curran, Ian R Crocker, Kirtesh R Patel
Preclinical evidence suggests angiotensin blockade therapy (ABT) decreases late radiation toxicities. This study aims to investigate the association between ABT and symptomatic radiation necrosis (SRN) following stereotactic radiosurgery (SRS). Resected brain metastases (rBM) and arteriovenous malformation (AVM) patients treated with SRS from 2002 to 2015 were identified. Patients in the ABT cohort were on therapy during SRS and at 1-month follow up. Kaplan Meier method and cumulative incidence model were used to analyze overall survival (OS) and intracranial outcomes...
November 9, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29121945/potential-dosimetric-benefits-of-adaptive-tumor-tracking-over-the-internal-target-volume-concept-for-stereotactic-body-radiation-therapy-of-pancreatic-cancer
#11
Konstantina Karava, Stefanie Ehrbar, Oliver Riesterer, Johannes Roesch, Stefan Glatz, Stephan Klöck, Matthias Guckenberger, Stephanie Tanadini-Lang
BACKGROUND: Radiotherapy for pancreatic cancer has two major challenges: (I) the tumor is adjacent to several critical organs and, (II) the mobility of both, the tumor and its surrounding organs at risk (OARs). A treatment planning study simulating stereotactic body radiation therapy (SBRT) for pancreatic tumors with both the internal target volume (ITV) concept and the tumor tracking approach was performed. The two respiratory motion-management techniques were compared in terms of doses to the target volume and organs at risk...
November 9, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/29121047/dosimetric-comparison-of-ct-guided-iodine-125-seed-stereotactic-brachytherapy-and-stereotactic-body-radiation-therapy-in-the-treatment-of-nsclc
#12
Ranran Li, Ying Zhang, Yuan Yuan, Qi Lin, Jianjian Dai, Ruicai Xu, Xudong Hu, Mingyong Han
This study aimed to assess the dosimetric differences between iodine-125 seed stereotactic brachytherapy (SBT) and stereotactic body radiation therapy (SBRT) in the treatment of non-small cell lung cancer (NSCLC). An SBT plan and an SBRT plan were generated for eleven patients with T1-2 NSCLC. Prescription of the dose and fractionation (fr) for SBRT was 48Gy/4fr. The planning aim for SBT was D90 (dose delivered to 90% of the target volume)≥120Gy. Student's paired t test was used to compare the dosimetric parameters...
2017: PloS One
https://www.readbyqxmd.com/read/29120662/comparison-of-mri-visualisation-between-linearly-placed-iron-containing-and-non-iron-containing-fiducial-markers-for-prostate-radiotherapy
#13
Osamu Tanaka, Hisao Komeda, Masayoshi Tamaki, Kensaku Seike, Shota Fujimoto, Eiichi Yama, Shigeki Hirose, Masayuki Matsuo
OBJECTIVE: Visualising the gold marker (GM) in CT and MRI is critical, especially for registration in high-precision radiotherapy. GM sizes vary. Large markers are easily visualised in MRI. Small GMs show fewer artefacts in CT but are harder to detect in MRI because the signal is influenced by metal in MRI. Therefore, we compared MRI visualisation between linearly placed new iron-containing marker and non-iron containing marker. METHODS: Twenty-seven patients underwent CT/MRI fusion-based intensity-modulated radiotherapy...
November 9, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29114619/incorporating-big-data-into-treatment-plan-evaluation-development-of-statistical-dvh-metrics-and-visualization-dashboards
#14
Charles S Mayo, John Yao, Avraham Eisbruch, James M Balter, Dale W Litzenberg, Martha M Matuszak, Marc L Kessler, Grant Weyburn, Carlos J Anderson, Dawn Owen, William C Jackson, Randall Ten Haken
Purpose: To develop statistical dose-volume histogram (DVH)-based metrics and a visualization method to quantify the comparison of treatment plans with historical experience and among different institutions. Methods and materials: The descriptive statistical summary (ie, median, first and third quartiles, and 95% confidence intervals) of volume-normalized DVH curve sets of past experiences was visualized through the creation of statistical DVH plots. Detailed distribution parameters were calculated and stored in JavaScript Object Notation files to facilitate management, including transfer and potential multi-institutional comparisons...
July 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/29114618/orthogonal-image-pairs-coupled-with-osms-for-noncoplanar-beam-angle-intracranial-single-isocenter-srs-treatments-with-multiple-targets-on-the-varian-edge-radiosurgery-system
#15
Jasmine A Oliver, Patrick Kelly, Sanford L Meeks, Twyla R Willoughby, Amish P Shah
Purpose: To characterize the accuracy of noncoplanar image guided radiation therapy with the Varian Edge radiosurgery system for intracranial stereotactic radiosurgery (SRS) treatments by assessing the accuracy of kV/kV orthogonal pair registration with Optical Surface Monitoring System (OSMS) monitoring relative to cone beam computed tomography (CT). Methods and materials: A Computerized Imaging Reference System head phantom and Encompass SRS Immobilization System were used to determine collision-free space for orthogonal image pairs (kV/kV) for couch rotations (CRs) of 45°, 30°, 15°, 345°, 330°, and 315°...
July 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/29114617/two-and-a-half-year-clinical-experience-with-the-world-s-first-magnetic-resonance-image-guided-radiation-therapy-system
#16
Benjamin W Fischer-Valuck, Lauren Henke, Olga Green, Rojano Kashani, Sahaja Acharya, Jeffrey D Bradley, Clifford G Robinson, Maria Thomas, Imran Zoberi, Wade Thorstad, Hiram Gay, Jiayi Huang, Michael Roach, Vivian Rodriguez, Lakshmi Santanam, Harold Li, Hua Li, Jessika Contreras, Thomas Mazur, Dennis Hallahan, Jeffrey R Olsen, Parag Parikh, Sasa Mutic, Jeff Michalski
Purpose: Magnetic resonance image guided radiation therapy (MR-IGRT) has been used at our institution since 2014. We report on more than 2 years of clinical experience in treating patients with the world's first MR-IGRT system. Methods and materials: A clinical service was opened for MR-IGRT in January 2014 with an MR-IGRT system consisting of a split 0.35T magnetic resonance scanner that straddles a ring gantry with 3 multileaf collimator-equipped (60)Co heads...
July 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/29114607/the-impact-of-different-stereotactic-radiation-therapy-regimens-for-brain-metastases-on-local-control-and-toxicity
#17
Rachel B Jimenez, Brian M Alexander, Anand Mahadevan, Andrzej Niemierko, Selvan Rajakesari, Nils D Arvold, Scott R Floyd, Kevin S Oh, Jay S Loeffler, Helen A Shih
Purpose: Stereotactic radiation therapy (SRT) enables focused, short course, high dose per fraction radiation delivery to brain tumors that are less ideal for single fraction treatment because of size, shape, or close proximity to sensitive structures. We sought to identify optimal SRT treatment regimens for maximizing local control while minimizing morbidity. Methods and materials: We performed a retrospective review of patients treated with SRT for solid brain metastases using variable dose schedules between 2001 and 2011 at 3 academic hospitals...
July 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/29106810/stereotactic-body-radiotherapy-for-early-stage-non-small-cell-lung-cancer-american-society-of-clinical-oncology-endorsement-of-the-american-society-for-radiation-oncology-evidence-based-guideline
#18
Bryan J Schneider, Megan E Daly, Erin B Kennedy, Mara B Antonoff, Stephen Broderick, Jill Feldman, Shruti Jolly, Bryan Meyers, Gaetano Rocco, Chad Rusthoven, Ben J Slotman, Daniel H Sterman, Brendon M Stiles
Purpose The American Society for Radiation Oncology (ASTRO) produced an evidence-based guideline on treatment with stereotactic body radiotherapy (SBRT) for patients with early-stage non-small-cell lung cancer. ASCO has a policy and set of procedures for endorsing and/or adapting clinical practice guidelines that have been developed by other professional organizations. Methods The ASTRO Evidence-Based Guideline for Stereotactic Body Radiotherapy for Early-Stage Non-Small-Cell Lung Cancer was reviewed for developmental rigor by methodologists...
November 6, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/29105011/modern-robot-assisted-radiosurgery-of-cerebral-angiomas-own-experiences-system-comparisons-and-comprehensive-literature-overview
#19
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/29102996/prostatectomy-versus-radiotherapy-for-early-stage-prostate-cancer-prepare-study-protocol-for-a-mixed-methods-study-of-treatment-decision-making-in-men-with-localised-prostate-cancer
#20
Allan Ben Smith, Pascal Mancuso, Mark Sidhom, Karen Wong, Megan Berry, Orlando Rincones, Dion Forstner, Lesley Bokey, Afaf Girgis
BACKGROUND: Men diagnosed with localised prostate cancer (LPC) wanting curative treatment face a highly preference-sensitive choice between prostatectomy and radiotherapy, which offer similar cure rates but different side effects. This study aims to determine the information, decision-making needs and preferences of men with LPC choosing between robotic prostatectomy and standard external beam or stereotactic radiotherapy. METHODS AND ANALYSIS: This study will be conducted at a large public teaching hospital in Australia offering the choice between robotic prostatectomy and radiotherapy from early 2017...
November 3, 2017: BMJ Open
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