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https://www.readbyqxmd.com/read/27911249/international-multicenter-cohort-study-of-pediatric-brain-arteriovenous-malformations-part-2-outcomes-after-stereotactic-radiosurgery
#1
Robert M Starke, Dale Ding, Hideyuki Kano, David Mathieu, Paul P Huang, Caleb Feliciano, Rafael Rodriguez-Mercado, Luis Almodovar, Inga S Grills, Danilo Silva, Mahmoud Abbassy, Symeon Missios, Douglas Kondziolka, Gene H Barnett, L Dade Lunsford, Jason P Sheehan
OBJECTIVE Pediatric patients (age < 18 years) harboring brain arteriovenous malformations (AVMs) are burdened with a considerably higher cumulative lifetime risk of hemorrhage than adults. Additionally, the pediatric population was excluded from recent prospective comparisons of intervention versus conservative management for unruptured AVMs. The aims of this multicenter, retrospective cohort study are to analyze the outcomes after stereotactic radiosurgery for unruptured and ruptured pediatric AVMs. METHODS We analyzed and pooled AVM radiosurgery data from 7 participating in the International Gamma Knife Research Foundation...
December 2, 2016: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/27910397/enhanced-magnetic-field-probe-array-for-improved-excluded-flux-calculations-on-the-c-2u-advanced-beam-driven-field-reversed-configuration-plasma-experiment
#2
T Roche, M C Thompson, R Mendoza, I Allfrey, E Garate, J Romero, J Douglass
External flux conserving coils were installed onto the exterior of the C-2U [M. W. Binderbauer et al., Phys. Plasmas 22, 056110 (2015)] confinement vessel to increase the flux confinement time of the system. The 0.5 in. stainless steel vessel wall has a skin time of ∼5 ms. The addition of the external copper coils effectively increases this time to ∼7 ms. This led to better-confined/longer-lived field-reversed configuration (FRC) plasmas. The fringing fields generated by the external coils have the side effect of rendering external field measurements invalid...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910387/a-phase-contrast-imaging-interferometer-system-for-detection-of-multiscale-electron-density-fluctuations-on-diii-d
#3
E M Davis, J C Rost, M Porkolab, A Marinoni, M A Van Zeeland
Heterodyne interferometry and phase contrast imaging (PCI) are robust, mature techniques for measuring low-k and high-k electron density fluctuations, respectively. This work describes the first-ever implementation of a combined PCI-interferometer. The combined system uses a single 10.6 μm probe beam, two interference schemes, and two detectors to measure electron density fluctuations at large spatiotemporal bandwidth (10 kHz <f < 5 MHz and 0 cm(-1) ≤k ≤ 20 cm(-1)), allowing simultaneous measurement of ion- and electron-scale instabilities...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910378/development-and-characterization-of-an-interferometer-for-calorimeter-based-absorbed-dose-to-water-measurements-in-a-medical-linear-accelerator
#4
Everardo Flores-Martinez, Martha J Malin, Larry A DeWerd
The quantity of relevance for external beam radiotherapy is absorbed dose to water (ADW). An interferometer was built, characterized, and tested to measure ADW within the dose range of interest for external beam radiotherapy using the temperature dependence of the refractive index of water. The interferometer was used to measure radiation-induced phase shifts of a laser beam passing through a (10 × 10 × 10) cm(3) water-filled glass phantom, irradiated with a 6 MV photon beam from a medical linear accelerator...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910333/observation-of-longitudinal-quadrupole-ion-bunch-oscillations-in-an-electrostatic-ion-beam-trap
#5
K Saha, R K Gangwar, O Heber, M L Rappaport, D Zajfman
Ions in an ion bunch trapped inside an Electrostatic Ion Beam Trap (EIBT) exhibit collective oscillations within the bunch under the influence of an external driving force. These internal oscillations have been measured explicitly using a new method with a particle detector outside the EIBT. In this approach, the evolving ion bunch is monitored along the entire trap length, in contrast to the localized single point measurements that are often carried out in other techniques. In the present study, quadrupole oscillations have been measured for the first time in an EIBT along with the dipole oscillations that were measured previously...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27908679/skin-surface-brachytherapy-a-survey-of-contemporary-practice-patterns
#6
Anna O Likhacheva, Phillip M Devlin, Shervin M Shirvani, Christopher A Barker, Phillip Beron, Ajay Bhatnagar, Stephen W Doggett, Lawrence Hochman, Charles Hsu, Michael Kasper, Martin Keisch, Subhakar Mutyala, Bradley Prestidge, Silvia Rodriguez Villalba, Vershalee Shukla, Srinath Sundararaman, Mitchell Kamrava
PURPOSE: The aim of this study was to define current patterns of care among radiation oncologists who use skin surface brachytherapy for the treatment of cutaneous squamous cell carcinoma (cSCC) and basal cell carcinoma (BCC) in academic and community settings. METHODS AND MATERIALS: A 30-question electronic survey was administered to clinician members of the American Brachytherapy Society. The respondents were asked to provide details regarding their clinical practice and their approach to skin surface brachytherapy...
November 28, 2016: Brachytherapy
https://www.readbyqxmd.com/read/27908621/radiotherapy-with-curative-intent-in-patients-with-early-stage-medically-inoperable-non-small-cell-lung-cancer-a-systematic-review
#7
REVIEW
Conrad B Falkson, Emily T Vella, Edward Yu, Medhat El-Mallah, Robert Mackenzie, Peter M Ellis, Yee C Ung
Patients with early-stage non-small-cell lung cancer (NSCLC) who are unable to undergo surgery can be offered radiation therapy (RT). Previously, conventional RT was offered; however, newer techniques such as stereotactic body RT (SBRT) have become available. The objective of the present systematic review was to investigate the effectiveness of RT with curative intent in patients with early-stage medically inoperable NSCLC. MEDLINE, EMBASE, and the Cochrane Library were searched for studies comparing stereotactic RT with curative intent compared with observation or other types of RT for early-stage, medically inoperable, NSCLC...
October 27, 2016: Clinical Lung Cancer
https://www.readbyqxmd.com/read/27908503/cobalt-60-machines-and-medical-linear-accelerators-competing-technologies-for-external-beam-radiotherapy
#8
B J Healy, D van der Merwe, K E Christaki, A Meghzifene
Medical linear accelerators (linacs) and cobalt-60 machines are both mature technologies for external beam radiotherapy. A comparison is made between these two technologies in terms of infrastructure and maintenance, dosimetry, shielding requirements, staffing, costs, security, patient throughput and clinical use. Infrastructure and maintenance are more demanding for linacs due to the complex electric componentry. In dosimetry, a higher beam energy, modulated dose rate and smaller focal spot size mean that it is easier to create an optimised treatment with a linac for conformal dose coverage of the tumour while sparing healthy organs at risk...
November 28, 2016: Clinical Oncology: a Journal of the Royal College of Radiologists
https://www.readbyqxmd.com/read/27903198/dosimetric-characterization-of-hypofractionated-gamma-knife-radiosurgery-of-large-or-complex-brain-tumors-versus-linear-accelerator-based-treatments
#9
Peng Dong, Angélica Pérez-Andújar, Dilini Pinnaduwage, Steve Braunstein, Philip Theodosopoulos, Michael McDermott, Penny Sneed, Lijun Ma
OBJECTIVE Noninvasive Gamma Knife (GK) platforms, such as the relocatable frame and on-board imaging, have enabled hypofractionated GK radiosurgery of large or complex brain lesions. This study aimed to characterize the dosimetric quality of such treatments against linear accelerator-based delivery systems that include the CyberKnife (CK) and volumetric modulated arc therapy (VMAT). METHODS Ten patients treated with VMAT at the authors' institution for large brain tumors (> 3 cm in maximum diameter) were selected for the study...
December 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27901070/low-frequency-piezoresonance-defined-dynamic-control-of-terahertz-wave-propagation
#10
Moumita Dutta, Soutik Betal, Xomalin G Peralta, Amar S Bhalla, Ruyan Guo
Phase modulators are one of the key components of many applications in electromagnetic and opto-electric wave propagations. Phase-shifters play an integral role in communications, imaging and in coherent material excitations. In order to realize the terahertz (THz) electromagnetic spectrum as a fully-functional bandwidth, the development of a family of efficient THz phase modulators is needed. Although there have been quite a few attempts to implement THz phase modulators based on quantum-well structures, liquid crystals, or meta-materials, significantly improved sensitivity and dynamic control for phase modulation, as we believe can be enabled by piezoelectric-resonance devices, is yet to be investigated...
November 30, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27900811/exuberant-squamous-metaplasia-with-calcification-following-intraoperative-radiotherapy-for-breast-carcinoma-report-of-an-unusual-case-and-retrospective-review-of-cases-from-a-single-institution
#11
Paula S Ginter, John Ng, Rebecca Zhuo, Alexander J Swistel, Timothy M D'Alfonso
Intraoperative radiotherapy (IORT) is a novel and increasingly utilized radiation technique in the treatment of breast carcinoma. There are few reports on the histologic changes seen in breast tissue from patients who have undergone IORT. We sought to evaluate the histologic changes observed in specimens received following IORT, as well as report an unusual case which prompted our study. A retrospective review of patients who received IORT and subsequently had breast tissue histologically evaluated at our institution was performed...
November 30, 2016: Breast Journal
https://www.readbyqxmd.com/read/27898749/-dosimetric-comparison-of-different-techniques-for-external-beam-accelerated-partial-breast-irradiation
#12
Gábor Stelczer, Tibor Major, Norbert Mészáros, Csaba Polgár, Csilla Pesznyák
The aim of this article is to evaluate and compare four different radiotherapy techniques of accelerated partial breast irradiation (APBI) considering planning quality, dosimetric and practical aspects. The investigated techniques are three dimensional conformal radiotherapy (3D-CRT), "step and shoot" (SS) and "sliding window" (SW) intensity-modulated radiotherapy, intensity-modulated arc therapy (RA). CT scans of 10 patients previously treated with APBI were selected for the study. Surgical clips were placed on the borders of the tumour bed during breast conserving surgery...
November 29, 2016: Magyar Onkologia
https://www.readbyqxmd.com/read/27898429/dosimetric-improvements-with-a-novel-breast-stereotactic-radiotherapy-device-for-delivery-of-preoperative-partial-breast-irradiation
#13
James W Snider Iii, Yildirim Mutaf, Elizabeth Nichols, Andrea Hall, Patrick Vadnais, William F Regine, Steven J Feigenberg
OBJECTIVE: Partial-breast irradiation (PBI) with external-beam radiotherapy has produced higher than expected rates of fair-to-poor cosmesis. Worsened outcomes have been correlated with larger volumes of breast tissue exposed to radiation. A novel breast-specific stereotactic radiotherapy (BSRT) device (BSRTD) has been developed at our institution and has shown promise in delivering highly conformal dose distributions. We compared normal tissue sparing with this device with that achieved with intensity-modulated radiation therapy (IMRT)-PBI...
November 30, 2016: Oncology
https://www.readbyqxmd.com/read/27895686/successful-treatment-of-a-67-year-old-woman-with-urethral-adenocarcinoma-with-the-use-of-external-beam-radiotherapy-and-image-guided-adaptive-interstitial-brachytherapy
#14
Jasmin Mujkanovic, Kari Tanderup, Mads Agerbæk, Ulla Bisgaard, Søren Høyer, Jacob Christian Lindegaard, Lars Fokdal
Primary urethral cancer (PUC) is a very rare disease. This case report illustrates a successful treatment approach of a 67-year-old woman with a urethral adenocarcinoma selected for an organ preserving treatment with external beam radiotherapy (EBRT) and interstitial brachytherapy (BT) boost, using the GEC-ESTRO target concept originally designed for locally advanced cervical cancer (LACC). Treatment included EBRT with 45 Gy in 25 fractions followed by image guided adaptive interstitial BT (IGABT) with a pulsed-dose-rate (PDR) BT boost with 30 Gy in 50 hourly pulses...
October 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/27895683/salvage-interstitial-brachytherapy-based-on-computed-tomography-for-recurrent-cervical-cancer-after-radical-hysterectomy-and-adjuvant-radiation-therapy-case-presentations-and-introduction-of-the-technique
#15
Zhong-Shan Liu, Jie Guo, Yang-Zhi Zhao, Xia Lin, Bin Chen, Ming Zhang, Jiang-Ming Li, Xiao-Jun Ren, Bing-Ya Zhang, Tie-Jun Wang
PURPOSE: Locally recurring cervical cancer after surgery and adjuvant radiotherapy remains a major therapeutic challenge. This paper presents a new therapeutic technique for such patients: interstitial brachytherapy (BT) guided by real-time three-dimensional (3D) computed tomography (CT). MATERIAL AND METHODS: Sixteen patients with recurrent cervical cancer after radical surgery and adjuvant external-beam radiotherapy (EBRT) were included in this study. These patients underwent high-dose-rate (HDR) interstitial BT with free-hand placement of metal needles guided by real-time 3D-CT...
October 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/27895682/development-and-clinical-implementation-of-a-new-template-for-mri-based-intracavitary-interstitial-gynecologic-brachytherapy-for-locally-advanced-cervical-cancer-from-ct-based-mupit-to-the-mri-compatible-template-benidorm-ten-years-of-experience
#16
Silvia Rodríguez Villalba, Jose Richart Sancho, Antonio Otal Palacín, Jose Perez-Calatayud, Manuel Santos Ortega
PURPOSE: To study outcome and toxicity in 59 patients with locally advanced cervix carcinoma treated with computed tomography (CT)-based Martinez universal perineal interstitial template (MUPIT) and the new magnetic resonance imaging (MRI)-compatible template Benidorm (TB). MATERIAL AND METHODS: From December 2005 to October 2015, we retrospectively analyzed 34 patients treated with MUPIT and 25 treated with the TB. Six 4 Gy fractions were prescribed to the clinical target volume (CTV) combined with external beam radiotherapy (EBRT)...
October 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/27895681/rectal-separation-using-hydroxypropyl-methylcellulose-in-intracavitary-brachytherapy-of-cervical-cancer-an-innovative-approach
#17
Swapnendu Basu, Kazi Sazzad Manir, Abhishek Basu, Koushik Ghosh
PURPOSE: This study was initiated to prove feasibility of hydrogel application in recto-vaginal space in intracavitary brachytherapy (ICBT) of cervical cancer in order to reduce rectal toxicity. MATERIAL AND METHODS: In a case of stage IIB cervical cancer, after external beam radiotherapy (EBRT), we planned ICBT 7 Gy × 3 fractions. In 1(st) fraction (Plan 1), due to narrow separation between rectum and cervix (0.18 cm), only 5 Gy was delivered at point A (with high-risk clinical target volume [HR-CTV] D90 5...
October 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/27895678/prostate-brachytherapy-in-ghana-our-initial-experience
#18
James Edward Mensah, Joel Yarney, Verna Vanderpuye, Evans Akpakli, Samuel Tagoe, Evans Sasu
PURPOSE: This study presents the experience of a brachytherapy team in Ghana with a focus on technology transfer and outcome. The team was initially proctored by experienced physicians from Europe and South Africa. MATERIAL AND METHODS: A total of 90 consecutive patients underwent either brachytherapy alone or brachytherapy in combination with external beam radiotherapy for prostate carcinoma between July 2008 and February 2014 at Korle Bu Teaching Hospital, Accra, Ghana...
October 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/27893426/sublethal-exposure-to-alpha-radiation-223ra-dichloride-enhances-various-carcinomas-sensitivity-to-lysis-by-antigen-specific-cytotoxic-t-lymphocytes-through-calreticulin-mediated-immunogenic-modulation
#19
Anthony S Malamas, Sofia R Gameiro, Karin M Knudson, James W Hodge
Radium-223 dichloride (Xofigo®; 223Ra) is an alpha-emitting radiopharmaceutical FDA-approved for the treatment of bone metastases in patients with advanced castration-resistant prostate cancer. It is also being examined clinically in patients with breast and lung carcinoma and patients with multiple myeloma. As with other forms of radiation, the aim of 223Ra is to reduce tumor burden by directly killing tumor cells. External beam (photon) and proton radiation have been shown to augment tumor sensitivity to antigen-specific CD8+ cytotoxic T lymphocytes (CTLs)...
November 23, 2016: Oncotarget
https://www.readbyqxmd.com/read/27892665/thyroid-function-after-postoperative-radiation-therapy-in-patients-with-breast-cancer
#20
Edyta Wolny-Rokicka, Andrzej Tukiendorf, Jerzy Wydmański, Danuta Roszkowska, Bogusław Staniul, Agnieszka Zembroń-Łacny
Objective: The aim of this study was to assess thyroid function in breast cancer patients exposed to therapeutic external beam radiation. The focus was on possible progressive changes and any relationships between the incidence of primary hypothyroidism, the time required to become hypothyroid, and factors such as chemotherapy, hormonotherapy and immunotherapy. Materials and Methods: Seventy females undergoing 3D conformal and IMRT radiation therapy for breast cancers were enrolled in a non-randomized prospective study...
January 10, 2016: Asian Pacific Journal of Cancer Prevention: APJCP
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