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https://www.readbyqxmd.com/read/28527605/analysis-of-gafchromic-ebt3-film-calibration-irradiated-with-gamma-rays-from-different-systems-gamma-knife-and-cobalt-60-unit
#1
Monsen Najafi, Ghazale Geraily, Alireza Shirazi, Mahbod Esfahani, Javad Teimouri
In recent years, Gafchromic films are used as an advanced instrument for dosimetry systems. The EBT3 films are a new generation of Gafchromic films. Our main interest is to compare the response of the EBT3 films exposed to gamma rays provided by the Theratron 780C as a conventional radiotherapy system and the Leksell Gamma Knife as a stereotactic radiotherapy system (SRS). Both systems use Cobalt-60 sources, thus using the same energy. However, other factors such as source-to-axis distance, number of sources, dose rate, direction of irradiation, shape of phantom, the field shape of radiation, and different scatter contribution may influence the calibration curve...
May 17, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28524797/the-relationship-of-dose-to-nerve-volume-in-predicting-pain-recurrence-after-stereotactic-radiosurgery-in-trigeminal-neuralgia
#2
Amparo Wolf, Amy Tyburczy, Jason Chao Ye, Girish Fatterpekar, Joshua S Silverman, Douglas Kondziolka
OBJECTIVE Approximately 75%-92% of patients with trigeminal neuralgia (TN) achieve pain relief after Gamma Knife surgery (GKS), although a proportion of these patients will experience recurrence of their pain. To evaluate the reasons for durability or recurrence, this study determined the impact of trigeminal nerve length and volume, the nerve dose-volume relationship, and the presence of neurovascular compression (NVC) on pain outcomes after GKS for TN. METHODS Fifty-eight patients with 60 symptomatic nerves underwent GKS for TN between 2013 and 2015, including 15 symptomatic nerves secondary to multiple sclerosis (MS)...
May 19, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28516364/preserving-normal-facial-nerve-function-and-improving-hearing-outcome-in-large-vestibular-schwannomas-with-a-combined-approach-planned-subtotal-resection-followed-by-gamma-knife-radiosurgery
#3
Roy Thomas Daniel, Constantin Tuleasca, Mercy George, Etienne Pralong, Luis Schiappacasse, Michele Zeverino, Raphael Maire, Marc Levivier
OBJECTIVE: To perform planned subtotal resection followed by gamma knife surgery (GKRS) in a series of patients with large vestibular schwannoma (VS), aiming at an optimal functional outcome for facial and cochlear nerves. METHODS: Patient characteristics, surgical and dosimetric features, and outcome were collected prospectively at the time of treatment and during the follow-up. RESULTS: A consecutive series of 32 patients was treated between July 2010 and June 2016...
May 17, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28514899/clinical-positioning-accuracy-for-multisession-stereotactic-radiotherapy-with-the-gamma-knife-perfexion
#4
Wade P Smith, Lori A Young, Mark H Phillips, Michael Cheung, Lia M Halasz, Jason K Rockhill
Multisession stereotactic radiation therapy is increasingly being seen as a preferred option for intracranial diseases in close proximity to critical structures and for larger target volumes. The objective of this study is to investigate the reproducibility of the Extend system from Elekta. A retrospective review was conducted for all patients treated with multisession Gamma Knife between July 2010 and June 2015, including both malignant and benign lesions. Eighty-four patients were treated in this 5-year span...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28513854/verification-of-dose-profiles-generated-by-the-convolution-algorithm-of-the-gamma-knife-%C3%A2-radiosurgery-planning-system
#5
Hyun-Tai Chung, Jeong-Hoon Park, Kook Jin Chun
PURPOSE: A convolution algorithm that takes into account electron-density inhomogeneity was recently introduced to calculate dose distributions for the Gamma Knife (GK) Perfexion(™) treatment planning program. The accuracies of the dose distributions computed using the convolution method were assessed using an anthropomorphic phantom and film dosimetry. METHODS: Absorbed-dose distributions inside a phantom (CIRS Radiosurgery Head Phantom, Model 605) were calculated using the convolution method of the GK treatment-planning software (Leksell Gamma Plan(®) version 10...
May 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28511975/leptomeningeal-failure-in-patients-with-breast-cancer-receiving-stereotactic-radiosurgery-for-brain-metastases
#6
REVIEW
Edina C Wang, Andrew J Huang, Karen E Huang, Emory R McTyre, Hui-Wen Lo, Kounosuke Watabe, Linda Metheny-Barlow, Adrian W Laxton, Stephen B Tatter, Roy E Strowd, Michael D Chan, Brandi R Page
PURPOSE: Prior studies suggest a high incidence of leptomeningeal failure (LMF) in breast cancer metastatic to brain. This study examines breast cancer-specific variables affecting development of LMF and survival after Gamma-Knife Radiosurgery (GKS). METHODS: Between 2000-2010, 149 (breast) and 658 other-histology patients were treated with GKS. Hormone/HER2, age, local/distant brain failure, prior craniotomy, and prior whole-brain radiotherapy (WBRT) were assessed...
May 13, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28509682/new-neurosurgical-approaches-for-tremor-and-parkinson-s-disease
#7
Alfonso Fasano, Andres M Lozano, Esther Cubo
PURPOSE OF REVIEW: The objective of this review is to gather the newest advances in the surgical treatment of tremor and Parkinson's disease. We will briefly discuss the potential applications of the new technologies of deep brain stimulation (DBS), and we will focus on MRI-guided focused ultrasound (MRgFUS). RECENT FINDINGS: Novel DBS devices are being progressively adopted, particularly electrodes allowing a longer stimulating surface (suitable for multiple targets stimulation) and current radial steering (to minimize side effects of stimulation)...
May 13, 2017: Current Opinion in Neurology
https://www.readbyqxmd.com/read/28505539/revisiting-bilateral-thalamotomy-for-tremor
#8
REVIEW
Jumana Alshaikh, Paul S Fishman
MRI guided focused ultrasound surgery (MRgFUS) has been FDA approved for unilateral treatment of essential tremor (ET). Before this non-incisional lesioning method can be applied to the treatment of both hemispheres the previous experience with bilateral thalamic ablation must be addressed. In particular, the high incidence of worsening of speech and balance associated with bilateral surgical thalamotomy, a rationale for the development of deep brain stimulation. The highest incidence of these complication occurred in the early years of surgery for movement disorders, when neither MRI nor current stereotactic methods were available...
May 1, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28503363/focused-ultrasound-for-essential-tremor-review-of-the-evidence-and-discussion-of-current-hurdles
#9
REVIEW
Mohammad Rohani, Alfonso Fasano
BACKGROUND: While there is no breakthrough progress in the medical treatment of essential tremor (ET), in the past decades several remarkable achievements happened in the surgical field, such as radiofrequency thalamotomy, thalamic deep brain stimulation, and gamma knife thalamotomy. The most recent advance in this area is magnetic resonance-guided focused ultrasound (MRgFUS). METHODS: The purpose of this review is to discuss the new developments and trials of MRgFUS in the treatment of ET and other tremor disorders...
2017: Tremor and Other Hyperkinetic Movements
https://www.readbyqxmd.com/read/28495008/a-fully-automatic-approach-for-multimodal-pet-and-mr-image-segmentation-in-gamma-knife-treatment-planning
#10
Leonardo Rundo, Alessandro Stefano, Carmelo Militello, Giorgio Russo, Maria Gabriella Sabini, Corrado D'Arrigo, Francesco Marletta, Massimo Ippolito, Giancarlo Mauri, Salvatore Vitabile, Maria Carla Gilardi
BACKGROUND AND OBJECTIVES: Nowadays, clinical practice in Gamma Knife treatments is generally based on MRI anatomical information alone. However, the joint use of MRI and PET images can be useful for considering both anatomical and metabolic information about the lesion to be treated. In this paper we present a co-segmentation method to integrate the segmented Biological Target Volume (BTV), using [(11)C]-Methionine-PET (MET-PET) images, and the segmented Gross Target Volume (GTV), on the respective co-registered MR images...
June 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28490155/endoscopic-treatment-of-hypothalamic-hamartomas
#11
REVIEW
Kyu Won Shim, Eun Kyung Park, Dong-Seok Kim
Hypothalamic hamartoma (HH) is a benign indolent lesion despite the presentation of refractory epilepsy. Behavioral disturbances and endocrine problems are additional critical symptoms that arise along with HHs. Due to its nature of generating epileptiform discharge and spreading to cortical region, various management strategies have been proposed and combined. Surgical approaches with open craniotomy or endoscopy, stereotactic approaches with radiosurgery and gamma knife surgery or radiofrequency thermos-coagulation, and laser ablation have been introduced...
May 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/28487460/functional-lesional-neurosurgery-for-tremor-a-protocol-for-a-systematic-review-and-meta-analysis
#12
Sebastian R Schreglmann, Joachim K Krauss, Jin Woo Chang, Kailash P Bhatia, Georg Kaegi
INTRODUCTION: The recent introduction of incision-less lesional neurosurgery using Gamma Knife and MRI-guided focused ultrasound has revived interest in lesional treatment options for tremor disorders. Preliminary literature researches reveal that the consistency of treatment effects after lesional neurosurgery for tremor has not formally been assessed yet. Similarly, the efficacy of different targets for lesional treatment and incidence of persistent side effects of lesional neurosurgical interventions has not been comprehensively assessed...
May 9, 2017: BMJ Open
https://www.readbyqxmd.com/read/28486221/evaluation-of-clinical-application-and-dosimetric-comparison-of-treatment-plans-of-gamma-knife-and-cyberknife-in-treating-arteriovenous-malformations
#13
Chun-Yuan Kuo, Yi-Chieh Tsai, An-Cheng Shiau, Hao-Wen Cheng, Hsiao-Wei Yu, Yu-Kai Su, Jo-Ting Tsai
PURPOSE: To analyze and compare the characteristics of dose distributions for Leksell Gamma Knife Perfexion (LGK-PFX) and CyberKnife (CK) in treating arteriovenous malformations (AVMs). SUBJECTS AND METHODS: Twenty-four patients with AVMs who received CK radiosurgery at a prescribed dose (PD) of 16-25 Gy in a single fraction were selected. A LGK-PFX treatment plan with the same PD was designed for each patient. Dosimetric values for both systems were compared with respect to the conformity index (CI); selectivity index (SI); gradient index (GI) of 75, 50, and 25% of the PD; heterogeneity index; volume of the brain tissue covered by doses of 10 and 12 Gy; maximum dose delivered to the brainstem; and beam-on time...
May 10, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28485803/clinical-efficacy-of-gamma-knife-and-surgery-treatment-of-mesial-temporal-lobe-epilepsy-and-their-effects-on-ef-tumt-and-ef-tsmt-expression
#14
X-Q Wang, X-D Zhang, Y-M Han, X-F Shi, Z-B Lan, X-X Men, Y-W Pan
OBJECTIVE: To study the clinical efficacy of gamma knife and surgery treatment of mesial temporal lobe epilepsy (MTLE) and their effects on EF-Tumt and EF-Tsmt expression. PATIENTS AND METHODS: The data of 78 cases of MTLE patients treated in our hospital from April 2011 to March 2013 were retrospectively analyzed. The patients were divided into two groups according to the treatment methods: the surgery group (including 41 cases) and the gamma knife group (including 37 cases)...
April 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28479525/lhermitte-duclos-disease-dysplastic-gangliocytoma-of-the-cerebellum-and-cowden-syndrome-clinical-experience-from-a-single-institution-with-long-term-follow-up
#15
Tao Jiang, Junmei Wang, Jiang Du, Shiqi Luo, Raynald Liu, Jian Xie, Ying Wang, Chunde Li
BACKGROUND: Adult-onset Lhermitte-Duclos disease (LDD) and Cowden syndrome (CS) are considered to be a single phakomatosis which belongs to PTEN Hamartoma Tumor Syndrome (PHTS) now. There is still controversy about the diagnosis and treatment. The authors describe the clinical features of LDD and CS with long term follow up. METHODS: From January 2001 to January 2017, 18 patients were admitted to the neurosurgery department of Beijing Tiantan Hospital. The authors analyzed the medical records of each patient and followed up every case...
May 4, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28465265/stereotactic-radiosurgery-for-dural-carotid-cavernous-sinus-fistulas
#16
Seong-Hyun Park, Ki-Su Park, Dong-Hun Kang, Jeong-Hyun Hwang, Sung-Kyoo Hwang
OBJECTIVE: We reviewed our 7-year experience to assess the efficacy of stereotactic radiosurgery (SRS) for dural carotid cavernous fistulas (DCCFs). We analyzed the clinical outcome, complications and angiographic results. METHODS: We performed a retrospective analysis of 18 consecutive patients with DCCF treated by SRS alone using Gamma Knife between 2009 and 2015. Median target volume was 2.6 cm(3) (range, 0.6-11.6 cm(3)) and median radiation dose to the target was 17 Gy (range, 14-19 Gy)...
April 29, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28434958/microsurgical-resection-following-failed-gamma-knife-radiosurgery-of-papillary-tumor-of-the-pineal-gland
#17
Anil Nanda, Piyush Kalakoti, Devi Prasad Patra, Tanmoy Maiti, Hai Sun
Primary papillary tumors of the pineal region (PTPR) are rare entities with distinct histopathological characteristics. Most common surgical approaches include the supra-cerebellar infratentorial corridor or the occipital interhemispheric approach. Gamma knife radiosurgery (GKRS) is an acceptable treatment modality for parenchymal tumors of the pineal gland, and often used as a primary treatment modality for asymptomatic and indolent lesions, and as an adjunct to surgical resection. In this presentation, we describe the surgical nuances of posterior interhemispheric approach in an elderly male with a previously failed empirical GKRS...
April 18, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28431024/radiosurgery-for-unruptured-brain-arteriovenous-malformations-an-international-multicenter-retrospective-cohort-study
#18
Dale Ding, Robert M Starke, Hideyuki Kano, John Y K Lee, David Mathieu, John Pierce, Paul Huang, Symeon Missios, Caleb Feliciano, Rafael Rodriguez-Mercado, Luis Almodovar, Inga S Grills, Danilo Silva, Mahmoud Abbassy, Douglas Kondziolka, Gene H Barnett, L Dade Lunsford, Jason P Sheehan
BACKGROUND: The role of intervention in the management of unruptured brain arteriovenous malformations (AVM) is controversial. OBJECTIVE: To analyze in a multicenter, retrospective cohort study, the outcomes following radiosurgery for unruptured AVMs and determine predictive factors. METHODS: We evaluated and pooled AVM radiosurgery data from 8 institutions participating in the International Gamma Knife Research Foundation. Patients with unruptured AVMs and ≥12 mo of follow-up were included in the study cohort...
June 1, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28425047/can-anti-vascular-endothelial-growth-factor-antibody-reverse-radiation-necrosis-a-preclinical-investigation
#19
Chong Duan, Carlos J Perez-Torres, Liya Yuan, John A Engelbach, Scott C Beeman, Christina I Tsien, Keith M Rich, Robert E Schmidt, Joseph J H Ackerman, Joel R Garbow
Anti-vascular endothelial growth factor (anti-VEGF) antibodies are a promising new treatment for late time-to-onset radiation-induced necrosis (RN). We sought to evaluate and validate the response to anti-VEGF antibody in a mouse model of RN. Mice were irradiated with the Leksell Gamma Knife Perfexion™ and then treated with anti-VEGF antibody, beginning at post-irradiation (PIR) week 8. RN progression was monitored via anatomic and diffusion MRI from weeks 4-12 PIR. Standard histology, using haematoxylin and eosin (H&E), and immunohistochemistry staining were used to validate the response to treatment...
April 19, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28419781/evaluation-of-stability-of-stereotactic-space-defined-by-cone-beam-ct-for-the-leksell-gamma-knife-icon
#20
Ismail AlDahlawi, Dheerendra Prasad, Matthew B Podgorsak
The Gamma Knife Icon comes with an integrated cone-beam CT (CBCT) for image-guided stereotactic treatment deliveries. The CBCT can be used for defining the Leksell stereotactic space using imaging without the need for the traditional invasive frame system, and this allows also for frameless thermoplastic mask stereotactic treatments (single or fractionated) with the Gamma Knife unit. In this study, we used an in-house built marker tool to evaluate the stability of the CBCT-based stereotactic space and its agreement with the standard frame-based stereotactic space...
April 17, 2017: Journal of Applied Clinical Medical Physics
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