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Image Guided Radiotherapy

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https://www.readbyqxmd.com/read/28715250/the-development-of-technology-for-effective-respiratory-gated-irradiation-using-an-image-guided-small-animal-irradiator
#1
M A Hill, J Thompson, A Kavanagh, I D C Tullis, R G Newman, J Prentice, J Beech, S Gilchrist, S Smart, E Fokas, B Vojnovic
The development of image-guided small animal irradiators represents a significant improvement over standard irradiators by enabling preclinical studies to mimic radiotherapy in humans. The ability to deliver tightly collimated targeted beams, in conjunction with gantry or animal couch rotation, has the potential to maximize tumor dose while sparing normal tissues. However, the current commercial platforms do not incorporate respiratory gating, which is required for accurate and precise targeting in organs subject to respiration related motions that may be up to the order of 5 mm in mice...
July 17, 2017: Radiation Research
https://www.readbyqxmd.com/read/28714454/a-back-projection-algorithm-in-the-presence-of-an-extra-attenuating-medium-towards-epid-dosimetry-for-the-mr-linac
#2
I Torres-Xirau, I Olaciregui-Ruiz, R A Rozendaal, P González, B J Mijnheer, J-J Sonke, U A van der Heide, A Mans
In external beam radiotherapy, electronic portal imaging devices (EPIDs) are frequently used for pre-treatment and for in vivo dose verification. Currently, various MR-guided radiotherapy systems are being developed and clinically implemented. Independent dosimetric verification is highly desirable. For this purpose we adapted our EPID-based dose verification system for use with the MR-Linac combination developed by Elekta in cooperation with UMC Utrecht and Philips. In this study we extended our back-projection method to cope with the presence of an extra attenuating medium between the patient and the EPID...
July 17, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28712277/moderate-hypofractionated-image-guided-thoracic-radiotherapy-for-locally-advanced-node-positive-non-small-cell-lung-cancer-patients-with-very-limited-lung-function-a-case-report
#3
Farkhad Manapov, Olarn Roengvoraphoj, Minglun Li, Chukwuka Eze
Patients with locally advanced lung cancer and very limited pulmonary function (forced expiratory volume in 1 second [FEV1] ≤ 1 L) have dismal prognosis and undergo palliative treatment or best supportive care. We describe two cases of locally advanced node-positive non-small cell lung cancer (NSCLC) patients with very limited lung function treated with induction chemotherapy and moderate hypofractionated image-guided radiotherapy (Hypo-IGRT). Hypo-IGRT was delivered to a total dose of 45 Gy to the primary tumor and involved lymph nodes...
June 2017: Radiation Oncology Journal
https://www.readbyqxmd.com/read/28702337/linear-ebus-guided-fiducial-marker-placement-to-guide-radiotherapy-for-endobronchial-radiographically-occult-synchronous-primary-squamous-cell-carcinoma-of-the-lung
#4
David Maurice Chambers, Gregory John Pfister, Umair Ahmad Gauhar
Radiation therapy has emerged as a useful alternative therapy for patients with early-stage, non-resectable lung cancer. In patients whose malignancies are difficult to localize on computed tomography imaging, such therapy becomes difficult. Fiducial markers are frequently placed in peripheral pulmonary lesions to assist radiation therapy. Although placement of markers under linear endobronchial ultrasonography within mediastinal and hilar lymph nodes has been reported, no strategy has been described to assist radiotherapy of purely endobronchial tumors...
2017: Respiratory Medicine Case Reports
https://www.readbyqxmd.com/read/28698408/dose-escalation-by-image-guided-intensity-modulated-radiotherapy-leads-to-an-increase-in-pain-relief-for-spinal-metastases-a-comparison-study-with-a-regimen-of-30-gy-in-10-fractions
#5
Jinlan He, Jianghong Xiao, Xingchen Peng, Baofeng Duan, Yan Li, Ping Ai, Min Yao, Nianyong Chen
PURPOSE: Under the existing condition that the optimum radiotherapy regimen for spinal metastases is controversial, this study investigates the benefits of dose escalation by image-guided intensity-modulated radiotherapy (IG-IMRT) with 60-66 Gy in 20-30 fractions for spinal metastases. RESULTS: In the dose-escalation group, each D50 of planning gross tumor volume (PGTV) was above 60 Gy and each Dmax of spinal cord planning organ at risk volume (PRV) was below 48 Gy...
July 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28697002/re-irradiation-of-cervical-and-endometrial-cancer
#6
Megan Llewelyn, Alexandra Taylor
PURPOSE OF REVIEW: Re-irradiation historically has been associated with unacceptable toxicity and limited benefit. Recent advances in radiotherapy can change the treatment paradigm to provide new salvage treatments for recurrences of cervical and endometrial cancer. RECENT FINDINGS: Image-guided brachytherapy is an effective method for salvaging central pelvic recurrence, although it has resulted in 20-25% severe late toxicity. Pelvic sidewall disease is not accessible to brachytherapy, so a combined modality approach with radical surgery and intraoperative radiotherapy is an alternative approach...
July 10, 2017: Current Opinion in Oncology
https://www.readbyqxmd.com/read/28692129/distortion-free-diffusion-mri-using-an-mri-guided-tri-cobalt-60-radiotherapy-system-sequence-verification-and-preliminary-clinical-experience
#7
Yu Gao, Fei Han, Ziwu Zhou, Minsong Cao, Tania Kaprealian, Mitchell Kamrava, Chenyang Wang, John Neylon, Daniel A Low, Yingli Yang, Peng Hu
PURPOSE: Monitoring tumor response during the course of treatment and adaptively modifying treatment plan based on tumor biological feedback may represent a new paradigm for radiotherapy. Diffusion MRI has shown great promises in assessing and predicting tumor response to radiotherapy. However, the conventional diffusion-weighted single-shot echo-planar-imaging (DW-ssEPI) technique suffers from limited resolution, severe distortion and possibly inaccurate ADC at low field strength. The purpose of this work is to develop a reliable, accurate and distortion-free diffusion MRI technique that is practicable for longitudinal tumor response evaluation and adaptive radiotherapy on a 0...
July 10, 2017: Medical Physics
https://www.readbyqxmd.com/read/28689346/electromagnetic-navigation-guided-neuroendoscopic-removal-of-radiation-induced-intraforniceal-cavernoma-as-a-late-complication-of-medulloblastoma-treatment
#8
Petr Liby, J Zamecnik, M Kyncl, J Zackova, M Tichy
INTRODUCTION: Medulloblastoma is the most frequent malignant brain tumour in children. Radiation-induced cavernous haemangiomas (RICHs) are a known late complication of radiation exposure, especially in young children. CASE REPORT: We present a patient who underwent subtotal resection of posterior fossa medulloblastoma with subsequent chemotherapy and radiotherapy at the age of 10 years. A new lesion in the region of the left foramen of Monro appeared 16 years later...
July 8, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28687397/estro-acrop-consensus-guideline-on-implementation-and-practice-of-stereotactic-body-radiotherapy-for-peripherally-located-early-stage-non-small-cell-lung-cancer
#9
Matthias Guckenberger, Nicolaus Andratschke, Karin Dieckmann, Mischa S Hoogeman, Morten Hoyer, Coen Hurkmans, Stephanie Lang, Eric Lartigau, Alejandra Méndez Romero, Suresh Senan, Dirk Verellen
BACKGROUND: Stereotactic body radiotherapy (SBRT) has become the standard of care for medically inoperable patients with peripherally located, early stage non-small cell lung cancer (NSCLC), and for those refusing surgical resection. Despite the availability of national and international guidelines, there exists substantial variability in many aspects of SBRT practice. METHODS: The ESTRO ACROP guideline is based on a questionnaire covering all aspects of SBRT implementation and practice (n=114 items)...
July 4, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28677574/radiotherapy-in-patients-with-hiv-current-issues-and-review-of-the-literature
#10
REVIEW
Filippo Alongi, Niccolò Giaj-Levra, Savino Sciascia, Alessandra Fozza, Sergio Fersino, Alba Fiorentino, Rosario Mazzola, Francesco Ricchetti, Michela Buglione, Dora Buonfrate, Dario Roccatello, Umberto Ricardi, Zeno Bisoffi
Although the introduction of highly active antiretroviral therapy has radically improved the life expectancy of patients with HIV, HIV positivity is still considered a major barrier to oncological treatment for patients with cancer because of their worse prognosis and increased susceptibility to toxic effects compared with patients who are immunocompetent. The use of radiotherapy with or without chemotherapy, immunotherapy, or molecular targeted therapy is the standard of care for several cancers. These new drugs and substantial improvements in radiotherapy techniques, including intensity-modulated radiotherapy, image-guided radiotherapy, and stereotactic ablative radiotherapy, are optimising the feasibility of such anticancer treatments and are providing new opportunities for patients with cancer and HIV...
July 2017: Lancet Oncology
https://www.readbyqxmd.com/read/28676107/study-protocol-multi-parametric-magnetic-resonance-imaging-for-therapeutic-response-prediction-in-rectal-cancer
#11
Trang Thanh Pham, Gary Liney, Karen Wong, Robba Rai, Mark Lee, Daniel Moses, Christopher Henderson, Michael Lin, Joo-Shik Shin, Michael Bernard Barton
BACKGROUND: Response to neoadjuvant chemoradiotherapy (CRT) of rectal cancer is variable. Accurate imaging for prediction and early assessment of response would enable appropriate stratification of management to reduce treatment morbidity and improve therapeutic outcomes. Use of either diffusion weighted imaging (DWI) or dynamic contrast enhanced (DCE) imaging alone currently lacks sufficient sensitivity and specificity for clinical use to guide individualized treatment in rectal cancer...
July 4, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28675492/development-of-patient-controlled-respiratory-gating-system-based-on-visual-guidance-for-magnetic-resonance-image-guided-radiation-therapy
#12
Jung-In Kim, Hanyoung Lee, Hong-Gyun Wu, Eui Kyu Chie, Hyun-Cheol Kang, Jong Min Park
PURPOSE: The aim of this study is to develop a visual guidance patient-controlled (VG-PC) respiratory gating system for respiratory-gated magnetic-resonance image-guided radiation therapy (MR-IGRT) and to evaluate the performance of the developed system. METHODS: The near-real-time cine planar MR image of a patient acquired during treatment was transmitted to a beam projector in the treatment room through an optical fiber cable. The beam projector projected the cine MR images inside the bore of the ViewRay system in order to be visible to a patient during treatment...
July 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28666767/towards-breast-cancer-rotational-radiotherapy-with-synchrotron-radiation
#13
Francesca Di Lillo, Giovanni Mettivier, Antonio Sarno, Roberta Castriconi, Paolo Russo
PURPOSE: We performed the first investigations, via measurements and Monte Carlo simulations on phantoms, of the feasibility of a new technique for synchrotron radiation rotational radiotherapy for breast cancer (SR(3)T). METHODS: A Monte Carlo (MC) code based on Geant4 toolkit was developed in order to simulate the irradiation with the SR(3)T technique and to evaluate the skin sparing effect in terms of centre-to-periphery dose ratio at different energies in the range 60-175keV...
June 27, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28659917/a-two-phase-expansion-protocol-combining-interleukin-il-15-and-il-21-improves-natural-killer-cell-proliferation-and-cytotoxicity-against-rhabdomyosarcoma
#14
Juliane Wagner, Viktoria Pfannenstiel, Anja Waldmann, Judith W J Bergs, Boris Brill, Sabine Huenecke, Thomas Klingebiel, Franz Rödel, Christian J Buchholz, Winfried S Wels, Peter Bader, Evelyn Ullrich
Rhabdomyosarcoma (RMS) is the most common soft tissue malignancy in children. Despite intensive research in recent decades the prognosis for patients with metastatic or relapsed diseases has hardly improved. New therapeutic concepts in anti-tumor therapy aim to modulate the patient's immune system to increase its aggressiveness or targeted effects toward tumor cells. Besides surgery, radiotherapy and chemotherapy, immune activation by direct application of cytokines, antibodies or adoptive cell therapy are promising approaches...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28657845/the-role-of-percutaneous-image-guided-thermal-ablation-for-the-treatment-of-pulmonary-malignancies
#15
Samdeep K Mouli, Ieva Kurilova, Constantinos T Sofocleous, Robert J Lewandowski
OBJECTIVE: Image-guided thermal ablation is a minimally invasive treatment option for patients with primary and secondary pulmonary malignancies. Modalities include radiofrequency ablation, microwave ablation, and cryoablation. CONCLUSION: Although no large randomized studies exist comparing ablation to surgery or radiotherapy, numerous studies have reported safety and efficacy for the treatment of both primary and metastatic disease in select patients. Future studies will refine patient selection, procedural technique, and assessment for local recurrence and will evaluate long-term survival...
June 28, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28650743/identifying-factors-and-root-causes-associated-with-near-miss-or-safety-incidents-in-patients-treated-with-radiotherapy-a-case-control-analysis
#16
Gregory D Judy, Prithima R Mosaly, Lukasz M Mazur, Gregg Tracton, Lawrence B Marks, Bhishamjit S Chera
PURPOSE: To identify factors associated with a near-miss or safety incident (NMSI) in patients undergoing radiotherapy and identify common root causes of NMSIs and their relationship with incident severity. METHODS: We retrospectively studied NMSIs filed between October 2014 and April 2016. We extracted patient-, treatment-, and disease-specific data from patients with an NMSI (n = 200; incident group) and a similar group of control patients (n = 200) matched in time, without an NMSI...
June 26, 2017: Journal of Oncology Practice
https://www.readbyqxmd.com/read/28649664/quantitative-analysis-of-the-spatial-distribution-of-metastatic-brain-lesions
#17
Ted K Yanagihara, Albert Lee, Tony J C Wang
Brain metastases (BMs) are the most common intracranial malignancy and afflict ~10%-20% of patients with cancer. BMs tend to present at the boundaries of gray and white matter because of the distribution of small vessels. In addition, metastases may not be randomly distributed across gross anatomical regions of the brain, but this has not previously been quantified. We retrospectively analyzed a series of 28 patients with recurrent BMs with a total of 150 lesions. Each lesion was manually defined based on T1 gadolinium-enhanced imaging...
March 2017: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/28640871/nomogram-to-predict-rectal-toxicity-following-prostate-cancer-radiotherapy
#18
Jean-Bernard Delobel, Khemara Gnep, Juan David Ospina, Véronique Beckendorf, Ciprian Chira, Jian Zhu, Alberto Bossi, Taha Messai, Oscar Acosta, Joël Castelli, Renaud de Crevoisier
BACKGROUND: To identify predictors of acute and late rectal toxicity following prostate cancer radiotherapy (RT), while integrating the potential impact of RT technique, dose escalation, and moderate hypofractionation, thus enabling us to generate a nomogram for individual prediction. METHODS: In total, 972 patients underwent RT for localized prostate cancer, to a total dose of 70 Gy or 80 Gy, using two different fractionations (2 Gy or 2.5 Gy/day), by means of several RT techniques (3D conformal RT [3DCRT], intensity-modulated RT [IMRT], or image-guided RT [IGRT])...
2017: PloS One
https://www.readbyqxmd.com/read/28640699/brain-tumor-imaging
#19
Kevin M Brindle, José L Izquierdo-García, David Y Lewis, Richard J Mair, Alan J Wright
Modern imaging techniques, particularly functional imaging techniques that interrogate some specific aspect of underlying tumor biology, have enormous potential in neuro-oncology for disease detection, grading, and tumor delineation to guide biopsy and resection; monitoring treatment response; and targeting radiotherapy. This brief review considers the role of magnetic resonance imaging and spectroscopy, and positron emission tomography in these areas and discusses the factors that limit translation of new techniques to the clinic, in particular, the cost and difficulties associated with validation in multicenter clinical trials...
July 20, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28638802/target-migration-from-re-inflation-of-adjacent-atelectasis-during-lung-stereotactic-body-radiotherapy
#20
Bijing Mao, Vivek Verma, Dandan Zheng, Xiaofeng Zhu, Nathan R Bennion, Abhijeet R Bhirud, Maria A Poole, Weining Zhen
Stereotactic body radiotherapy (SBRT) is a widely accepted option for the treatment of medically inoperable early-stage non-small cell lung cancer (NSCLC). Herein, we highlight the importance of interfraction image guidance during SBRT. We describe a case of early-stage NSCLC associated with segmental atelectasis that translocated 15 mm anteroinferiorly due to re-expansion of the adjacent segmental atelectasis following the first fraction. The case exemplifies the importance of cross-sectional image-guided radiotherapy that shows the intended target, as opposed to aligning based on rigid anatomy alone, especially in cases associated with potentially "volatile" anatomic areas...
June 10, 2017: World Journal of Clinical Oncology
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