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https://www.readbyqxmd.com/read/29446004/a-comparative-study-of-three-small-field-detectors-for-patient-specific-stereotactic-arc-dosimetry
#1
Luke K Webb, Emma K Inness, Paul H Charles
This paper examines the difference in patient specific dosimetry using three different detectors of varying active volume, density and composition, for quality assurance of stereotactic treatments. A PTW 60017 unshielded electron diode, an Exradin W1 scintillator, and a PTW 31014 PinPoint small volume ionisation chamber were setup in a Lucy 3D QA phantom, and were positioned at the isocentre of an Elekta Axesse, with beam modulator collimator, using Exactrac and a HexaPODTM couch. Dose measurements were acquired for 43 stereotactic arcs, and compared to BrainLAB iPlan version 3...
February 14, 2018: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29429794/treatment-plan-quality-and-delivery-accuracy-assessments-on-3-imrt-delivery-methods-of-stereotactic-body-radiotherapy-for-spine-tumors
#2
Long Huang, Toufik Djemil, Tingliang Zhuang, Martin Andrews, Samuel T Chao, John H Suh, Ping Xia
Stereotactic body radiotherapy (SBRT) for spine tumors has demonstrated clinical effectiveness. The treatment planning and delivery techniques have evolved from dynamic conformal arc therapy, to fixed gantry angle intensity modulated radiotherapy (IMRT), and most recently to volumetric modulated arc therapy (VMAT). A hybrid-arc (HARC) planning and delivery method combining dynamic conformal arc therapy delivery with a number of equally spaced IMRT beams is proposed. In this study we investigated plan quality, delivery accuracy, and efficiency of 3 delivery techniques: IMRT, HARC, and VMAT...
February 8, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29425986/is-edema-a-matter-of-concern-after-laser-ablation-of-epileptogenic-focus
#3
Vivek Tandon, Michael Lang, Poodipedi Sarat Chandra, Ashwini Sharan, Ajay Garg, Manjari Tripathi
BACKGROUND: A stereotactically placed laser fiber can deliver thermal energy to an epileptogenic focus in brain. This procedure is done under intraoperative (thermography) magnetic resonance imaging (MRI) guidance. Thermoablation can lead to edema in surrounding area and can cause secondary insult. In this case report of three cases, we have quantified the edema produced after laser ablation, with sequential MRI in immediate post-operative period. CASE DESCRIPTION(S): Three patients of intractable epilepsy underwent proper neurological and neuro-radiological workup to localize the site of epileptogenic foci...
February 6, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29399375/treatment-of-colloid-cyst-of-the-third-ventricle-by-stereotactic-aspiration-followed-by-radiosurgery-report-of-four-cases
#4
Jeremy P Morgan, Steven C McGraw, Wilson T Asfora
Background: Colloid cysts are rare benign lesions with potentially devastating results. Complications intra and posttreatment can result in high rates of recurrence. Stereotactic radiosurgery may present an attractive option for decreasing the rate of recurrence in conjunction with stereotactic aspiration. Case Description: Here, we report four cases of colloid cyst of the third ventricle managed by stereotactic aspiration with the use of the Leksell frame followed by stereotactic radiosurgery with the BrainLab/Novalis linear accelerator...
2018: Surgical Neurology International
https://www.readbyqxmd.com/read/29380067/a-new-system-of-computer-assisted-navigation-leading-to-reduction-in-operating-time-in-uncemented-total-hip-replacement-in-a-matched-population
#5
Fouad A Chaudhry, Sanaa Z Ismail, Edward T Davis
Computer-assisted navigation techniques are used to optimise component placement and alignment in total hip replacement. It has developed in the last 10 years but despite its advantages only 0.3% of all total hip replacements in England and Wales are done using computer navigation. One of the reasons for this is that computer-assisted technology increases operative time. A new method of pelvic registration has been developed without the need to register the anterior pelvic plane (BrainLab hip 6.0) which has shown to improve the accuracy of THR...
January 29, 2018: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/29290555/-experimental-determination-of-correction-factors-of-four-detectors-used-in-small-field-radiotherapy
#6
L Ben Salem, A Essadok, I Saidani, M Mahdouani, M Benna, K Mahjoubi, M Besbes, F Benna
PURPOSE: The aim of this work is to determine experimentally the correction factors [Formula: see text] for four active commercial dosimeters: two microchambers and two diode detectors based on the output factor measured with radiochromic film for a radiotherapy linear accelerator equipped with circular cones. MATERIALS AND METHODS: Initially, a radiochromic film dosimetry measurement protocol with an accuracy of 2% was developed to approach the "reference output factor"...
December 28, 2017: Cancer Radiothérapie: Journal de la Société Française de Radiothérapie Oncologique
https://www.readbyqxmd.com/read/29222590/technical-accuracy-of-the-integration-of-an-external-ultrasonography-system-into-a-navigation-platform-effects-of-ultrasonography-probe-registration-and-target-detection
#7
Frederic A Wanis, Lars Wessels, Marcus H T Reinges, Eberhard Uhl, Andreas Jödicke
BACKGROUND: Intraoperative navigated ultrasonography has reached clinical acceptance, while published data for the accuracy of some systems are missing. We technically quantified and optimised the accuracy of the integration of an external ultrasonography system into a BrainLab navigation system. METHODS: A high-end ultrasonography system (Elegra; Siemens, Erlangen, Germany) was linked to a navigation system (Vector Vision; BrainLab, Munich, Germany). In vitro accuracy and precision was calculated from differences between a real world target (high-precision crosshair phantom) and the ultrasonography image of this target in the navigation coordinate system...
December 8, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29173916/dosimetric-effect-of-uncorrected-rotations-in-lung-sbrt-with-stereotactic-imaging-guidance
#8
Han Liu, Martin Andrews, Andrey Markovich, Tingliang Zhuang
PURPOSE: To evaluate the dosimetric impact of uncorrected rotations on the planning target volume (PTV) coverage for early stage non-small cell lung cancer patients treated with stereotactic body radiotherapy using Brainlab ExacTrac image guidance. METHODS: Twenty-two patients were retrospectively selected. Two scenarios of uncorrected rotations were simulated with magnitude of 1°, 2°, 3° and 5°: (1) rotation around the treatment isocenter; and (2) roll and yaw rotations around a setup isocenter...
October 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/29078974/-two-is-not-enough-impact-of-the-number-of-tissue-samples-obtained-from-stereotactic-brain-biopsies-in-suspected-glioblastoma
#9
Johanna Quick-Weller, Julia Tichy, Patrick N Harter, Stephanie Tritt, Peter Baumgarten, Oliver Bähr, Nazife Dinc, Bedjan Behmanesh, Lutz Weise, Volker Seifert, Gerhard Marquardt
OBJECTIVE: Stereotactic procedures are performed in many neurosurgical departments in order to obtain tumor tissue from brain lesions for histopathological evaluation. Biopsies can be performed frame-guided and frame less. Some departments use a biopsy needle (cylinder probe), others a forceps for repetitive smaller tissue samples. Although the applied techniques are somehow different, it is still unclear how many tissue samples have to be taken to establish reliably a final diagnosis based on histopathological and genetic examinations...
October 24, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28962000/stereotactic-drainage-of-brainstem-abscess-with-the-brainlab-varioguide%C3%A2-system-and-the-airo%C3%A2-intraoperative-ct-scanner-technical-case-report
#10
Cesar C Almeida, Ayse Uzuner, Ron L Alterman
BACKGROUND AND IMPORTANCE: Stereotactic biopsies or needle aspirations of posterior fossa lesions are technically challenging. Here we report a novel technique for performing these procedures employing the Airo™ intraoperative computed tomographic (CT) scanner and the VarioGuide™ articulated arm (BrainLab, Munich, Germany). CLINICAL PRESENTATION: A 62-yr-old woman presented with an irregularly shaped, enhancing lesion of the left pons/middle cerebellar peduncle...
August 12, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28961938/implantation-of-depth-electrodes-in-children-using-varioguide%C3%A2-frameless-navigation-system-technical-note
#11
Marcelo Budke, Josue M Avecillas-Chasin, Francisco Villarejo
BACKGROUND: Electrode placement in epilepsy surgery seeks to locate the sites of ictal onset and early propagation. An invasive diagnostic procedure, stereoelectroencephalography (SEEG) is usually implemented with frame-based methods that can be especially problematic in young children. OBJECTIVE: To evaluate the feasibility and accuracy of a new technique for frameless SEEG in children using the VarioGuide® system (Brainlab AG, München, Germany). METHODS: A frameless stereotactic navigation system was used to implant depth electrodes with percutaneous drilling and bolt insertion in pediatric patients with medically refractory epilepsy...
September 9, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28927210/navigation-and-image-injection-for-control-of-bone-removal-and-osteotomy-planes-in-spine-surgery
#12
Michael Kosterhon, Angelika Gutenberg, Sven Rainer Kantelhardt, Elefterios Archavlis, Alf Giese
BACKGROUND AND IMPORTANCE: In contrast to cranial interventions, neuronavigation in spinal surgery is used in few applications, not tapping into its full technological potential. We have developed a method to preoperatively create virtual resection planes and volumes for spinal osteotomies and export 3-D operation plans to a navigation system controlling intraoperative visualization using a surgical microscope's head-up display. The method was developed using a Sawbone ® model of the lumbar spine, demonstrating feasibility with high precision...
April 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28833165/volumetric-analysis-of-olfactory-neuroblastoma-skull-base-laterality-and-implications-on-neck-disease
#13
John P Marinelli, Jamie J Van Gompel, Michael J Link, Eric J Moore, Daniel L Price, Katherine A Lees, Mark W Kaczor, Jeffrey R Janus
OBJECTIVE: To determine if the laterality of primary tumors in patients with olfactory neuroblastoma (ONB) influenced the pattern and development of neck disease. METHODS: Using a retrospective cohort study design from 1994 to 2015, the primary tumors of patients who either presented with or developed neck disease were volumetrically analyzed using iPlan software (version 3.0.0, BrainLAB, Feldkirchen, Germany) by two independent observers. Agreement of volume-derived sidedness was assessed with a kappa statistic, whereas agreement in volume-derived degree of tumor laterality was evaluated with an intraclass correlation coefficient...
August 22, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28804044/real-time-ultrasound-doppler-enhances-precision-in-image-guided-approaches-to-the-cerebellopontine-angle
#14
Davit Baghdasaryan, Marcel Albrecht, Mihr Shahnazaryan, Steffen Rosahl
OBJECTIVE: To evaluate efficacy and reliability of intraoperative Doppler sonography in localizing the transverse and sigmoid sinuses during lateral suboccipital craniotomy. METHODS: A 16-Mhz intraoperative micro-Doppler ultrasound (16Mhz, Multi-Dop pro, Compumedics, Singen, Germany) was applied to detect the medial border of the sigmoid sinus and the inferior border of the transverse sinus in 25 patients. Micro-Doppler measurements were compared with magnetic resonance- and computed tomography-based image guidance (Kolibri, Brainlab, Munich, Germany)...
November 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28721330/truebeam-radiosurgery-for-the-treatment-of-trigeminal-neuralgia-preliminary-results-at-a-single-institution
#15
Mena G Kerolus, Neilayan Sen, Sonal Mayekar, Alistar Templeton, Julius Turian, Aidnag Diaz, Lorenzo Munoz, Richard W Byrne, Sepehr Sani
INTRODUCTION: Radiosurgery is now an established method of satisfactory pain control in patients with trigeminal neuralgia (TN). The Varian Truebeam STx (Varian Medical Systems, Palo Alto, CA) linear accelerator (LINAC) system is an arc-based, frameless stereotactic radiosurgery system used for the treatment of TN. To our knowledge, there has been only one published series of patient histories that documents the use of a frameless LINAC system for the treatment of TN. We describe the treatment parameters, patient outcomes, and complications associated with the treatment of TN...
June 16, 2017: Curēus
https://www.readbyqxmd.com/read/28711290/biopsies-of-pediatric-brainstem-lesions-display-low-morbidity-but-strong-impact-on-further-treatment-decisions
#16
Johanna Quick-Weller, Stephanie Tritt, Bedjan Behmanesh, Michel Mittelbronn, Andrea Spyrantis, Nazife Dinc, Lutz Weise, Volker Seifert, Gerhard Marquardt, Thomas M Freiman
OBJECTIVE: The course of malignant brain stem gliomas in childhood is rarely positive. Because of limited therapeutic options and potentially hazardous biopsies oncologist often relay on MRI diagnoses only for further therapy decisions. In this study we show that brain stem biopsies display a low morbidity rate and neuropathological assessment has a considerable impact on further treatment decision. METHODS: Within 18-months five children with brainstem symptoms and the radiological diagnosis of a malignant brainstem glioma, were identified...
October 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28602884/autostereoscopic-three-dimensional-neuronavigation-to-the-sella-technical-note
#17
A Nimer Amr, Jens Conrad, Sven Kantelhardt, Alf Giese
BACKGROUND: A drawback of conventional neuronavigation is the necessity of focusing on two-dimensional images in 3 planes at the same time to determine one's position in the operating field. A solution would be to merge the images into a single three-dimensional (3D) image that mirrors the actual anatomy. The introduction of holographic glassless 3D monitors paved the way to 3D navigation. We present our experience with 3D neuronavigation as exemplified by navigation to and within the sella...
September 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28542254/evaluations-of-the-setup-discrepancy-between-brainlab-6d-exactrac-and-cone-beam-computed-tomography-used-with-the-imaging-guidance-system-novalis-tx-for-intracranial-stereotactic-radiosurgery
#18
Se An Oh, Jae Won Park, Ji Woon Yea, Sung Kyu Kim
The objective of this study was to evaluate the setup discrepancy between BrainLAB 6 degree-of-freedom (6D) ExacTrac and cone-beam computed tomography (CBCT) used with the imaging guidance system Novalis Tx for intracranial stereotactic radiosurgery. We included 107 consecutive patients for whom white stereotactic head frame masks (R408; Clarity Medical Products, Newark, OH) were used to fix the head during intracranial stereotactic radiosurgery, between August 2012 and July 2016. The patients were immobilized in the same state for both the verification image using 6D ExacTrac and online 3D CBCT...
2017: PloS One
https://www.readbyqxmd.com/read/28466444/a-pilot-study-on-geometrical-uncertainties-for-intra-ocular-cancers-in-radiotherapy
#19
Rachitha Antony, Alan Herschtal, Stephen Todd, Claire Phillips, Annette Haworth
A system for stabilising and monitoring eye movements for linac-based stereotactic radiotherapy associated with the mobile eye, the Eye Tracker, was developed. Whilst the Eye Tracker design is based on a previously reported system, the purpose of this study was to confirm that the modified version can be used with clinically acceptable treatment margins. We report the estimates of the margin required to account for inter- and intra-fraction eye motion based on data from 12 consecutive patients treated with the Eye Tracker system in place...
May 2, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28466154/spinal-cord-constraints-in-the-era-of-high-precision-radiotherapy-retrospective-analysis-of-62%C3%A2-spinal-paraspinal-lesions-with-possible-infringements-of-spinal-cord-constraints-within-a%C3%A2-minimal-volume
#20
Sebastian Zschaeck, Peter Wust, Reinhold Graf, Waldemar Wlodarczyk, Reinhard Schild, Alexander Henry Thieme, Mirko Weihrauch, Volker Budach, Pirus Ghadjar
OBJECTIVE: Current constraints aim to minimize the risk of radiation myelitis by the use of restrictive maximal spinal cord doses, commonly 50 Gy. However, several studies suggested that a dose-volume effect could exist. Based on these observations, we evaluated patients receiving potentially excessive doses to the spinal cord within minimal volumes. PATIENTS AND METHODS: Patients receiving radiotherapy between June 2010 and May 2015 using the Novalis(TM) (Varian, Palo Alto, CA, USA; Brainlab, Heimstetten, Germany) radiosurgery system were retrospectively analyzed...
July 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
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