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Ding GX, Homann KL. The effects of different photon beam energies in stereotactic radiosurgery with cones. Med Phys 2023; 50:5201-5211. [PMID: 37122235 DOI: 10.1002/mp.16435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 04/13/2023] [Accepted: 04/13/2023] [Indexed: 05/02/2023] Open
Abstract
BACKGROUND Stereotactic radiosurgery (SRS) relies on small fields to ablate lesions. Currently, linac based treatment is delivered via circular cones using a 6 MV beam. There is interest in both lower energy photon beams, which can offer steeper dose fall off as well as higher energy photon beams, which have higher dose rates, thus reducing radiation delivery times. Of interest in this study is the 2.5 MV beam developed for imaging applications and both the 6 and 10 MV flattening-filter-free (FFF) beams, which can achieve dose rates up to 2400 cGy/min. PURPOSE This study aims to assess the benefit and feasibility among different energy beams ranging from 2.5 to 10 MV beams by evaluating the dosimetric effects of each beam and comparing the dose to organs-at-risk (OARs) for two separate patient plans. One based on a typical real patient tremor utilizing a 4 mm cone and the other a typical brain metastasis delivered with a 10 mm cone. METHODS The Monte Carlo codes BEAMnrc/DOSXYZnrc were used to generate beams of 2.5 MV, 6 MV-FFF, 6 MV-SRS, 6 MV, 10 MV-FFF, and 10 MV from a Varian TrueBeam except 6 MV-SRS, which is taken from a Varian TX model linear accelerator. Each beam's energy spectrum, mean energy, %dd curve, and dose profile were obtained by analyzing the simulated beams. Calculated patient dose distributions were compared among six different energy beam configurations based on a realistic treatment plan for thalamotomy and a conventional brain metastasis plan. Dose to OARs were evaluated using dose-volume histograms for the same target dose coverage. RESULTS The mean energies of photons within the primary beam projected area were insensitive to cone sizes and the values of percentage depth-dose curves (%dd) at d = 5 cm and SSD = 95 cm for a 4 mm (10 mm) cone ranges from 62.6 (64.4) to 82.2 (85.7) for beam energy ranging from 2.5 to 10 MV beams, respectively. Doses to OARs were evaluated among these beams based on real treatment plans delivering 15 000 and 2200 cGy to the target with a 4 and 10 mm cone, respectively. The maximum doses to the brainstem, which is 10 mm away from the isocenter, was found to be 434 (300), 632 (352), 691 (362), 733 (375), 822 (403), and 975 (441) cGy for 2.5 MV, 6 MV-FFF, 6 MV-SRS, 6 MV, 10 MV-FFF, and 10 MV beams delivering 15 000 (2200) cGy target dose, respectively. CONCLUSION Using the 6 MV-SRS as reference, changes of the maximum dose (691 cGy) to the brain stem are -37%, -9%, +6%, +19%, and 41% for 2.5 MV, 6 MV-FFF, 6 MV, 10 MV-FFF, and 10 MV beams, respectively, based on the thalamotomy plan, where the "-" or "+" signs indicate the percentage decrease or increase. Changes of the maximum dose (362 cGy) to brain stem, based on the brain metastasis plan are much less for respective beam energies. The sum of 21 arcs beam-on time was 39 min on our 6 MV-SRS beam with 1000 cGy/min for thalamotomy. The beam-on time can be reduced to 16 min with 10 MV-FFF.
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Affiliation(s)
- George X Ding
- Department of Radiation Oncology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Kenneth L Homann
- Department of Radiation Oncology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
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Goc B, Roch-Zniszczoł A, Larysz D, Zarudzki Ł, Stąpór-Fudzińska M, Rożek A, Woźniak G, Boczarska-Jedynak M, Miszczyk L, Napieralska A. The Effectiveness and Toxicity of Frameless CyberKnife Based Radiosurgery for Parkinson's Disease-Phase II Study. Biomedicines 2023; 11:biomedicines11020288. [PMID: 36830825 PMCID: PMC9952894 DOI: 10.3390/biomedicines11020288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 01/15/2023] [Accepted: 01/17/2023] [Indexed: 01/21/2023] Open
Abstract
Frame-based stereotactic radiosurgery (SRS) has an established role in the treatment of tremor in patients with Parkinson's disease (PD). The low numbers of studies of frameless approaches led to our prospective phase 2 open-label single-arm clinical trial (NCT02406105), which aimed to evaluate the safety and efficacy of CyberKnife frameless SRS. Twenty-three PD patients were irradiated on the area of the thalamic ventral nuclei complex with gradually increasing doses of 70 to 105 Gy delivered in a single fraction. After SRS, patients were monitored for tremor severity and the toxicity of the treatment. Both subjective improvement and dose-dependent efficacy were analysed using standard statistical tests. The median follow-up was 23 months, and one patient died after COVID-19 infection. Another two patients were lost from follow-up. Hyper-response resulting in vascular toxicity and neurologic complications was observed in two patients irradiated with doses of 95 and 100 Gy, respectively. A reduction in tremor severity was observed in fifteen patients, and six experienced stagnation. A constant response during the whole follow-up was observed in 67% patients. A longer median response time was achieved in patients irradiated with doses equal to or less than 85 Gy. Only two patients declared no improvement after SRS. The efficacy of frameless SRS is high and could improve tremor control in a majority of patients. The complication rate is low, especially when doses below 90 Gy are applied. Frameless SRS could be offered as an alternative for patients ineligible for deep brain stimulation; however, studies regarding optimal dose are required.
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Affiliation(s)
- Bartłomiej Goc
- Radiotherapy Department, MSC National Research Institute of Oncology Gliwice Branch, 44-102 Gliwice, Poland
| | - Agata Roch-Zniszczoł
- Radiotherapy Department, MSC National Research Institute of Oncology Gliwice Branch, 44-102 Gliwice, Poland
| | - Dawid Larysz
- Department of Head and Neck Surgery for Children and Adolescents, University of Warmia and Mazury in Olsztyn, 10-561 Olsztyn, Poland
| | - Łukasz Zarudzki
- Department of Radiology and Diagnostic Imaging, MSC National Research Institute of Oncology Gliwice Branch, 44-102 Gliwice, Poland
| | - Małgorzata Stąpór-Fudzińska
- Department of Radiotherapy Planning, MSC National Research Institute of Oncology Gliwice Branch, 44-102 Gliwice, Poland
| | - Agnieszka Rożek
- “Kangur” Centre for Treatment of CNS Disorders and Child Development Support in Katowice, 40-594 Katowice, Poland
| | - Grzegorz Woźniak
- Radiotherapy Department, MSC National Research Institute of Oncology Gliwice Branch, 44-102 Gliwice, Poland
| | - Magdalena Boczarska-Jedynak
- Neurology and Restorative Medicine Department, Health Institute dr Boczarska-Jedynak, 32-600 Oświęcim, Poland
| | - Leszek Miszczyk
- Radiotherapy Department, MSC National Research Institute of Oncology Gliwice Branch, 44-102 Gliwice, Poland
| | - Aleksandra Napieralska
- Radiotherapy Department, MSC National Research Institute of Oncology Gliwice Branch, 44-102 Gliwice, Poland
- Correspondence:
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Hua W, Xu B, Zhang X, Zhang X, Chen T. Setup error and residual error analysis of ExacTrac X-ray image guidance system in stereotactic radiotherapy for brain metastases. JOURNAL OF RADIATION RESEARCH AND APPLIED SCIENCES 2022. [DOI: 10.1016/j.jrras.2022.100474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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4
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Devan SP, Luo G, Jiang X, Xie J, Dean D, Johnson LS, Morales-Paliza M, Harmsen H, Xu J, Kirschner AN. Rodent Model of Brain Radionecrosis using Clinical LINAC-based Stereotactic Radiosurgery. Adv Radiat Oncol 2022; 7:101014. [PMID: 36060637 PMCID: PMC9436710 DOI: 10.1016/j.adro.2022.101014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 06/21/2022] [Indexed: 11/18/2022] Open
Abstract
Purpose Methods and Materials Results Conclusions
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Affiliation(s)
- Sean P. Devan
- Chemical and Physical Biology Program, Vanderbilt University, Nashville, Tennessee
- Vanderbilt University Institute of Imaging Science
| | | | - Xiaoyu Jiang
- Vanderbilt University Institute of Imaging Science
- Radiology and Radiologic Sciences
| | - Jingping Xie
- Vanderbilt University Institute of Imaging Science
| | | | | | | | - Hannah Harmsen
- Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Junzhong Xu
- Vanderbilt University Institute of Imaging Science
- Radiology and Radiologic Sciences
| | - Austin N. Kirschner
- Departments of Radiation Oncology
- Corresponding author: Austin N. Kirschner, MD, PhD
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Khattab MH, Sherry AD, Devan SP, Luo G, Chaballout BH, Jean-Baptiste S, Xu J, Bick S, Petrie WM, Cmelak AJ. Noninvasive Capsulotomy for Refractory Depression by Frameless Stereotactic Radiosurgery. Int J Radiat Oncol Biol Phys 2022; 113:960-966. [PMID: 35595157 DOI: 10.1016/j.ijrobp.2022.04.042] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 04/16/2022] [Accepted: 04/28/2022] [Indexed: 11/29/2022]
Abstract
PURPOSE Effective treatment options for refractory depression are needed. Recent advancements permit both precise ablative radiation and functional neurologic connectome analysis using standard MRI. We combined these innovations to perform stereotactic radiosurgical capsulotomy for the treatment of medically refractory major depressive disorder and study connectome response using a novel tractography-based approach. METHODS AND MATERIALS Patients with medically refractory depression were enrolled on a prospective pilot single-arm observational trial from 2020 to 2021 at a single academic tertiary referral center. Bilateral ablation of the anterior limb of the internal capsule was accomplished by mask-based linear accelerator stereotactic radiosurgery. Beck's Depression Inventory measured efficacy. Montreal Cognitive Assessment evaluated cognition. RESULTS Three patients were enrolled. Depression burden was improved by 88% at 12 month follow-up and by 55% at 18 month follow-up for patient 1 and 2, respectively. Patient 1 discontinued ketamine therapy, and patient 2 discontinued electroconvulsive therapy. Patient 3 reported global improvement in symptoms and function at 3 months. All 3 patients had reduction or resolution of suicidal ideation. No patient experienced cognitive decline or neurologic toxicity, and MoCA score, as well as subjective patient-reported evaluations of concentration and attention, were superior after treatment. Tractography confirmed intended disruption of the cortico-striatal-thalamo-cortical loop with structural reorganization in the connectome. Connectome change was consistent between patients. Observed increases in caudate and putamen connectivity and decreases in thalamic connectivity may explain improved concentration, attention, and depression. The diversity and magnitude of connectome change may correlate with degree of clinical response. CONCLUSIONS In three patients with refractory depression, radiosurgical capsulotomy significantly reduced the burden of depression. Functional connectome reorganization offers neurobiological evidence to support further investigations of the role of radiosurgery in depression.
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Affiliation(s)
- Mohamed H Khattab
- Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN; Minneapolis Radiation Oncology, Edina, MN.
| | - Alexander D Sherry
- Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN; Department of Radiation Oncology, Division of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX
| | - Sean P Devan
- Department of Radiology and Radiological Sciences, Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, TN
| | - Guozhen Luo
- Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN
| | - Basil H Chaballout
- University of South Carolina School of Medicine Greenville, Greenville, SC
| | - Samuel Jean-Baptiste
- Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN
| | - Junzhong Xu
- Department of Radiology and Radiological Sciences, Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, TN
| | - Sarah Bick
- Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, TN
| | - William M Petrie
- Department of Psychiatry, Vanderbilt University Medical Center, Nashville, TN
| | - Anthony J Cmelak
- Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN
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Luo G, Cameron BD, Wang L, Yu H, Neimat JS, Hedera P, Phibbs F, Bradley EB, Cmelak AJ, Kirschner AN. Targeting for stereotactic radiosurgical thalamotomy based on tremor treatment response. J Neurosurg 2022; 136:1387-1394. [PMID: 34715657 DOI: 10.3171/2021.7.jns21160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 07/01/2021] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Stereotactic radiosurgery (SRS) treats severe, medically refractory essential tremor and tremor-dominant Parkinson disease. However, the optimal target for SRS treatment within the thalamic ventral intermediate nucleus (VIM) is not clearly defined. This work evaluates the precision of the physician-selected VIM target, and determines the optimal SRS target within the VIM by correlation between early responders and nonresponders. METHODS Early responders and nonresponders were assessed retrospectively by Elements Basal Ganglia Atlas autocontouring of the VIM on the pre-SRS-treatment 1-mm slice thickness T1-weighted MRI and correlating the center of the post-SRS-treatment lesion. Using pre- and posttreatment diffusion tensor imaging, the fiber tracking package in the Elements software generated tremor-related tracts from autosegmented motor cortex, thalamus, red nucleus, and dentate nucleus. Autocontouring of the VIM was successful for all patients. RESULTS Among 23 patients, physician-directed SRS targets had a medial-lateral target range from +2.5 mm to -2.0 mm from the VIM center. Relative to the VIM center, the SRS isocenter target was 0.7-0.9 mm lateral for 6 early responders and 0.9-1.1 mm medial for 4 nonresponders (p = 0.019), and without differences in the other dimensions: 0.2 mm posterior and 0.6 mm superior. Dose-volume histogram analyses for the VIM had no significant differences between responders and nonresponders between 20 Gy and 140 Gy, mean or maximum dose, and dose to small volumes. Tractography data was obtained for 4 patients. CONCLUSIONS For tremor control in early responders, the Elements Basal Ganglia Atlas autocontour for the VIM provides the optimal SRS target location that is 0.7-0.9 mm lateral to the VIM center.
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Affiliation(s)
| | | | | | - Hong Yu
- 3Neurosurgery, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Joseph S Neimat
- 4Department of Neurological Surgery, University of Louisville, Kentucky; and
| | - Peter Hedera
- 5Department of Neurology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Fenna Phibbs
- 5Department of Neurology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Elise B Bradley
- 5Department of Neurology, Vanderbilt University Medical Center, Nashville, Tennessee
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7
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Doudard A, Guérin C, Dufreneix S, Josset S. Design and automation of specific geometric quality controls for cone-radiosurgery treatments. Phys Med 2022; 96:1-8. [PMID: 35189430 DOI: 10.1016/j.ejmp.2022.02.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 01/12/2022] [Accepted: 02/12/2022] [Indexed: 11/29/2022] Open
Abstract
PURPOSE The Varian TrueBeam STx linac can be equipped with BrainLAB stereotactic cones and ExacTrac imaging system for SRS treatments. However, these two third-party systems lack integration in a self-performance diagnosis tool dedicated to the SRS platform. The aim of this work was to design and automate essential geometric tests considering the complete set of cones with diameter range from 4 to 15 mm. METHODS EPID-based tests were focused on the cone alignment, the radiation isocentricity and the isocenters congruence. Images acquired with or without the BrainLAB pointer were analysed using the Hough transform and morphological filtering operations, after assessment of the algorithm accuracy using simulated images. The new Machine QA program was experimented over one year. RESULTS A subpixel resolution of 0.02 mm was found for the circular-field center detection algorithm. The tests results did not depend on the pointer location. The maximum deviations reported were in accordance with the AAPM SRS guidelines. The accurate localization of the linac radiation isocenter allowed for guidance of the ExacTrac calibration. A misalignment reaching 0.2 mm was measured for all cones but one, highlighting the benefit of systematizing this control before each patient SRS treatment. CONCLUSION An effective in-house QA program dedicated to SRS cones was developed to supplement the standard machine performance check on our mixed SRS platform. Specific geometric tests even include the smallest 4-mm cone, which could be of great interest for future clinical indications such as the radiosurgery of functional disorders.
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Affiliation(s)
- A Doudard
- Department of Medical Physics, Institut de Cancérologie de l'Ouest, Saint-Herblain/Angers, France
| | - C Guérin
- Department of Medical Physics, Institut de Cancérologie de l'Ouest, Saint-Herblain/Angers, France
| | - S Dufreneix
- Department of Medical Physics, Institut de Cancérologie de l'Ouest, Saint-Herblain/Angers, France
| | - S Josset
- Department of Medical Physics, Institut de Cancérologie de l'Ouest, Saint-Herblain/Angers, France.
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8
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Khattab MH, Cmelak AJ, Sherry AD, Luo G, Wang L, Yu H, Hedera P, Phibbs FT, Lindsell CJ, Neimat J, Kirschner AN. Noninvasive Thalamotomy for Refractory Tremor by Frameless Radiosurgery. Int J Radiat Oncol Biol Phys 2021; 112:121-130. [PMID: 34454047 DOI: 10.1016/j.ijrobp.2021.08.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 07/27/2021] [Accepted: 08/12/2021] [Indexed: 11/27/2022]
Abstract
OBJECTIVE We sought to determine whether a more widely accessible, non-invasive frameless approach to radiosurgical thalamotomy would improve objective measures of refractory essential or parkinsonian tremor without added toxicity compared to reports of frame-based radiosurgery. METHODS We conducted a single-arm pilot observational prospective trial of adult patients with essential or parkinsonian tremor from 2013 to 2019 and report results at one-year follow-up. Patients were treated with frameless unilateral radiosurgical ablation of the thalamic ventral intermediate nucleus to a maximum dose of 160 Gy. Treatment response was measured by the Fahn-Tolosa-Marin (FTM) tremor rating scale and the Quality of Life in Essential Tremor or Parkinson's Disease Questionnaire obtained prior to treatment and at 3, 6, 9, and 12 months. RESULTS Thirty-three patients, including 23 with essential tremor and 10 with Parkinson's disease, were enrolled. Overall treatment response rate per FTM was 83% (n=15/18) at 6 months. There was a marked improvement in tremor, with average total FTM reduction of 21% at 3 months (from 46 to 30 points, p=0.003) and 41% at 6 months (from 46 to 24 points, p=0.001). At 6 months, functional decline had regressed by 54% (from 15 to 7 points, p=0.001). Quality of life improved by 57% (p=0.001) at 6 months in patients with essential tremor, and patients with Parkinson's Disease had unchanged quality of life. At one-year follow-up, grade 2 neurologic adverse events were observed in 6% (n=2/33) of patients without any grade ≥ 3 events. CONCLUSION Noninvasive, frameless radiosurgical thalamotomy may be a feasible treatment for patients with refractory tremor and demonstrates short-term safety at one-year follow-up. This pilot study provides promising preliminary descriptions of efficacy, and definitive estimates of long-term safety and benefit require further study with longer follow-up.
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Affiliation(s)
- Mohamed H Khattab
- Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN.
| | - Anthony J Cmelak
- Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN
| | - Alexander D Sherry
- Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN
| | - Guozhen Luo
- Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN
| | - Li Wang
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN
| | - Hong Yu
- Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, TN
| | - Peter Hedera
- Department of Neurology, Vanderbilt University Medical Center, Nashville, TN; Department of Neurology, University of Louisville School of Medicine, Louisville, KY
| | - Fenna T Phibbs
- Department of Neurology, Vanderbilt University Medical Center, Nashville, TN
| | | | - Joseph Neimat
- Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, TN; Department of Neurological Surgery, University of Louisville School of Medicine, Louisville, KY
| | - Austin N Kirschner
- Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN
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Gutierrez-Aceves GA, Rodriguez-Camacho A, Celis-Lopez MA, Moreno-Jimenez S, Herrera-Gonzalez JA. Frameless radiosurgical third ventriculostomy: Technical report. Surg Neurol Int 2020; 11:398. [PMID: 33282458 PMCID: PMC7710479 DOI: 10.25259/sni_247_2020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 10/23/2020] [Indexed: 11/28/2022] Open
Abstract
Background: We describe the technical report and results of the first image-guided, linear accelerator, frameless radiosurgical third ventriculostomy. Methods: We report a 20 years old man, with diplopia, balance disturbances, and limitation for gaze supraversion. Magnetic resonance imaging resonance imaging of the brain and cranial computed tomography showed showed a left thalamic-midbrain lesion that caused partial compression of the Silvio aqueduct and mild ventricular dilatation. The biopsy revealed the diagnosis of pleomorphic xanthoastrocytoma. Before radical treatment of the tumor with fractionated stereotactic radiotherapy, the patient underwent to frameless radiosurgical third ventriculostomy, on the TrueBeam STX® platform with the ExacTrac localization system. The target used was the one defined on the floor of the third ventricle, at the midpoint between the mammillary bodies and the infundibular recess. The prescription dose was 120 Gy, given using a monoisocentric technique of multiple noncoplanar circular arches. The geometric arrangement of the plan consisted of 15 arches, with a 4 mm cone, distributed over a 110° table. Results: There was symptomatic and image improvement two days after radiosurgery. On CT, a reduction in ventricular dilation was observed with a reduction in the Evans index from 0.39 (initial CT) to 0.29 (CT at 15 days). In 3.0T magnetic resonance image at 3 months, we showed the third ventriculostomy. There have been no treatment failures or complications. Conclusion: It is possible to effectively perform the frameless radiosurgical third ventriculostomy without associated morbidity in the short term.
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Affiliation(s)
| | - Alejandro Rodriguez-Camacho
- Radio Neurosurgery Unit, National Institute of Neurology and Neurosurgery "Dr. Manuel Velasco Suarez", Mexico City, Mexico
| | - Miguel Angel Celis-Lopez
- Radio Neurosurgery Unit, National Institute of Neurology and Neurosurgery "Dr. Manuel Velasco Suarez", Mexico City, Mexico
| | - Sergio Moreno-Jimenez
- Radio Neurosurgery Unit, National Institute of Neurology and Neurosurgery "Dr. Manuel Velasco Suarez", Mexico City, Mexico
| | - Jose Alfredo Herrera-Gonzalez
- Radio Neurosurgery Unit, National Institute of Neurology and Neurosurgery "Dr. Manuel Velasco Suarez", Mexico City, Mexico
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O'Beirn M, Benghiat H, Meade S, Heyes G, Sawlani V, Kong A, Hartley A, Sanghera P. The Expanding Role of Radiosurgery for Brain Metastases. MEDICINES (BASEL, SWITZERLAND) 2018; 5:medicines5030090. [PMID: 30110927 PMCID: PMC6165316 DOI: 10.3390/medicines5030090] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 08/03/2018] [Accepted: 08/07/2018] [Indexed: 06/08/2023]
Abstract
Stereotactic radiosurgery (SRS) has become increasingly important in the management of brain metastases due to improving systemic disease control and rising incidence. Initial trials demonstrated SRS with whole-brain radiotherapy (WBRT) improved local control rates compared with WBRT alone. Concerns with WBRT associated neurocognitive toxicity have contributed to a greater use of SRS alone, including for patients with multiple metastases and following surgical resection. Molecular information, targeted agents, and immunotherapy have also altered the landscape for the management of brain metastases. This review summarises current and emerging data on the role of SRS in the management of brain metastases.
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Affiliation(s)
- Mark O'Beirn
- Hall-Edwards Radiotherapy Research Group, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham B15 2TH, UK.
| | - Helen Benghiat
- Hall-Edwards Radiotherapy Research Group, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham B15 2TH, UK.
| | - Sara Meade
- Hall-Edwards Radiotherapy Research Group, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham B15 2TH, UK.
| | - Geoff Heyes
- Hall-Edwards Radiotherapy Research Group, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham B15 2TH, UK.
| | - Vijay Sawlani
- Neuroradiology, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham B15 2TH, UK.
| | - Anthony Kong
- Hall-Edwards Radiotherapy Research Group, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham B15 2TH, UK.
| | - Andrew Hartley
- Hall-Edwards Radiotherapy Research Group, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham B15 2TH, UK.
| | - Paul Sanghera
- Hall-Edwards Radiotherapy Research Group, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham B15 2TH, UK.
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Gao Y, Schilling KG, Stepniewska I, Xu J, Landman BA, Dawant BM, Anderson AW. Tests of clustering thalamic nuclei based on various dMRI models in the squirrel monkey brain. PROCEEDINGS OF SPIE--THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 2018; 10578. [PMID: 30467451 DOI: 10.1117/12.2293879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Background Clustering thalamic nuclei is important for both research and clinical purposes. For example, ventral intermediate nuclei in thalami serve as targets in both deep brain stimulation neurosurgery and radiosurgery for treating patients suffering from movement disorders (e.g., Parkinson's disease and essential tremor). Diffusion magnetic resonance imaging (dMRI) is able to reflect tissue microstructure in the central nervous system via fitting different models, such as, the diffusion tensor (DT), constrained spherical deconvolution (CSD), neurite orientation dispersion and density imaging (NODDI), diffusion kurtosis imaging (DKI) and the spherical mean technique (SMT). Purpose To test which of the above-mentioned dMRI models is better for thalamic parcellation, we proposed a framework of k-means clustering, implemented it on each model, and evaluated the agreement with histology. Method An ex vivo monkey brain was scanned in a 9.4T MRI scanner at 0.3mm resolution with b values of 3000, 6000, 9000 and 12000 s/mm2. K-means clustering on each thalamus was implemented using maps of dMRI models fitted to the same data. Meanwhile, histological nuclei were identified by AChE and Nissl stains of the same brain. Overall agreement rate and agreement rate for each nucleus were calculated between clustering and histology. Sixteen thalamic nuclei on each hemisphere were included. Results Clustering with the DKI model has slightly higher overall agreement rate but clustering with other dMRI models result in higher agreement rate in some nuclei. Conclusion dMRl models should be carefully selected to better parcellate the thalamus, depending on the specific purpose of the parcellation.
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Affiliation(s)
- Yurui Gao
- Biomedical Engineering, Vanderbilt University, Nashville, TN, USA 37235.,Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA 37235
| | - Kurt G Schilling
- Biomedical Engineering, Vanderbilt University, Nashville, TN, USA 37235.,Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA 37235
| | - Iwona Stepniewska
- Psychological Science, Vanderbilt University, Nashville, TN, USA 37235
| | - Junzhong Xu
- Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA 37235.,Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA 37235
| | - Bennett A Landman
- Biomedical Engineering, Vanderbilt University, Nashville, TN, USA 37235.,Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA 37235.,Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN, USA 37235.,Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA 37235
| | - Benoit M Dawant
- Biomedical Engineering, Vanderbilt University, Nashville, TN, USA 37235.,Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN, USA 37235.,Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA 37235
| | - Adam W Anderson
- Biomedical Engineering, Vanderbilt University, Nashville, TN, USA 37235.,Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA 37235.,Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA 37235
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Popple RA, Wu X, Brezovich IA, Markert JM, Guthrie BL, Thomas EM, Bredel M, Fiveash JB. The virtual cone: A novel technique to generate spherical dose distributions using a multileaf collimator and standardized control-point sequence for small target radiation surgery. Adv Radiat Oncol 2018; 3:421-430. [PMID: 30197943 PMCID: PMC6127970 DOI: 10.1016/j.adro.2018.02.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 01/09/2018] [Accepted: 02/21/2018] [Indexed: 02/05/2023] Open
Abstract
Purpose The study aimed to develop and demonstrate a standardized linear accelerator multileaf collimator-based method of delivering small, spherical dose distributions suitable for radiosurgical treatment of small targets such as the trigeminal nerve. Methods and materials The virtual cone is composed of a multileaf collimator–defined field with the central 2 leaves set to a small gap. For 5 table positions, clockwise and counter-clockwise arcs were used with collimator angles of 45 and 135 degrees, respectively. The dose per degree was proportional to the sine of the gantry angle. The dose distribution was calculated by the treatment planning system and measured using radiochromic film in a skull phantom for leaf gaps of 1.6, 2.1, and 2.6 mm. Cones with a diameter of 4 mm and 5 mm were measured for comparison. Output factor constancy was investigated using a parallel-plate chamber. Results The mean ratio of the measured-to-calculated dose was 0.99, 1.03, and 1.05 for 1.6, 2.1, and 2.6 mm leaf gaps, respectively. The diameter of the measured (calculated) 50% isodose line was 4.9 (4.6) mm, 5.2 (5.1) mm, and 5.5 (5.5) mm for the 1.6, 2.1, and 2.6 mm leaf gap, respectively. The measured diameter of the 50% isodose line was 4.5 and 5.7 mm for the 4 mm and 5 mm cones, respectively. The standard deviation of the parallel-plate chamber signal relative to a 10 cm × 10 cm field was less than 0.4%. The relative signal changed 32% per millimeter change in leaf gap, indicating that the parallel-plate chamber is sensitive to changes in gap width. Conclusions The virtual cone is an efficient technique for treatment of small spherical targets. Patient-specific quality assurance measurements will not be necessary in routine clinical use. Integration directly into the treatment planning system will make planning using this technique extremely efficient.
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Affiliation(s)
- Richard A Popple
- Department of Radiation Oncology, The University of Alabama at Birmingham, Birmingham, Alabama
| | - Xingen Wu
- Department of Radiation Oncology, The University of Alabama at Birmingham, Birmingham, Alabama
| | - Ivan A Brezovich
- Department of Radiation Oncology, The University of Alabama at Birmingham, Birmingham, Alabama
| | - James M Markert
- Department of Neurosurgery, The University of Alabama at Birmingham, Birmingham, Alabama
| | - Barton L Guthrie
- Department of Neurosurgery, The University of Alabama at Birmingham, Birmingham, Alabama
| | - Evan M Thomas
- Department of Radiation Oncology, The University of Alabama at Birmingham, Birmingham, Alabama
| | - Markus Bredel
- Department of Radiation Oncology, The University of Alabama at Birmingham, Birmingham, Alabama
| | - John B Fiveash
- Department of Radiation Oncology, The University of Alabama at Birmingham, Birmingham, Alabama
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Ding GX, Walters B. Dosimetric effects of incorrect jaw settings in cranial radiosurgery. Biomed Phys Eng Express 2018. [DOI: 10.1088/2057-1976/aaa162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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