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Image fusion radiation therapy

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https://www.readbyqxmd.com/read/28533050/dual-core-steered-non-rigid-registration-for-multi-modal-images-via-bi-directional-image-synthesis
#1
Xiaohuan Cao, Jianhua Yang, Yaozong Gao, Yanrong Guo, Guorong Wu, Dinggang Shen
In prostate cancer radiotherapy, computed tomography (CT) is widely used for dose planning purposes. However, because CT has low soft tissue contrast, it makes manual contouring difficult for major pelvic organs. In contrast, magnetic resonance imaging (MRI) provides high soft tissue contrast, which makes it ideal for accurate manual contouring. Therefore, the contouring accuracy on CT can be significantly improved if the contours in MRI can be mapped to CT domain by registering MRI with CT of the same subject, which would eventually lead to high treatment efficacy...
May 13, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28472175/characterization-of-3d-printing-techniques-toward-patient-specific-quality-assurance-spine-shaped-phantom-for-stereotactic-body-radiation-therapy
#2
Min-Joo Kim, Seu-Ran Lee, Min-Young Lee, Jason W Sohn, Hyong Geon Yun, Joon Yong Choi, Sang Won Jeon, Tae Suk Suh
Development and comparison of spine-shaped phantoms generated by two different 3D-printing technologies, digital light processing (DLP) and Polyjet has been purposed to utilize in patient-specific quality assurance (QA) of stereotactic body radiation treatment. The developed 3D-printed spine QA phantom consisted of an acrylic body phantom and a 3D-printed spine shaped object. DLP and Polyjet 3D printers using a high-density acrylic polymer were employed to produce spine-shaped phantoms based on CT images. Image fusion was performed to evaluate the reproducibility of our phantom, and the Hounsfield units (HUs) were measured based on each CT image...
2017: PloS One
https://www.readbyqxmd.com/read/28397316/proposed-expansion-margins-for-planning-organ-at-risk-volume-for-lenses-during-radiation-therapy-of-the-nasal-cavity-in-dogs-and-cats
#3
Zaki Jafry, Arnon Gal, Andre Fleck, Johnson Darko, Valerie J Poirier
Radiation therapy protocols for the feline or canine nasal cavity can damage epithelial cells of the posterior pole of the lens and lead to the development of cataracts. Aims of this retrospective, descriptive study were to calculate movements of the lens during radiation therapy of the nasal cavity in a sample of cats and dogs, and to propose species-specific expansion margins for planning organ at risk volume (PRV) to minimize radiation doses to the lens. All included patients were immobilized with an indexed bite block and positioned in a vacuum positioning cushion for head irradiation...
April 11, 2017: Veterinary Radiology & Ultrasound
https://www.readbyqxmd.com/read/28376237/use-of-image-registration-and-fusion-algorithms-and-techniques-in-radiotherapy-report-of-the-aapm-radiation-therapy-committee-task-group-no-132
#4
Kristy K Brock, Sasa Mutic, Todd R McNutt, Hua Li, Marc L Kessler
Image registration and fusion algorithms exist in almost every software system that creates or uses images in radiotherapy. Most treatment planning systems support some form of image registration and fusion to allow the use of multimodality and time-series image data and even anatomical atlases to assist in target volume and normal tissue delineation. Treatment delivery systems perform registration and fusion between the planning images and the in-room images acquired during the treatment to assist patient positioning...
April 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28333017/effect-of-prostate-magnetic-resonance-imaging-ultrasound-fusion-guided-biopsy-on-radiation-treatment-recommendations
#5
Aaron Reed, Luca F Valle, Uma Shankavaram, Andra Krauze, Aradhana Kaushal, Erica Schott, Theresa Cooley-Zgela, Bradford Wood, Peter Pinto, Peter Choyke, Baris Turkbey, Deborah E Citrin
PURPOSE: Targeted magnetic resonance imaging (MRI)/ultrasound fusion prostate biopsy (MRI-Bx) has recently been compared with the standard of care extended sextant ultrasound-guided prostate biopsy (SOC-Bx), with the former associated with an increased rate of detection of clinically significant prostate cancer. The present study sought to determine the influence of MRI-Bx on radiation therapy and androgen deprivation therapy (ADT) recommendations. METHODS AND MATERIALS: All patients who had received radiation treatment and had undergone SOC-Bx and MRI-Bx at our institution were included...
April 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28115952/salvage-high-dose-rate-brachytherapy-for-histologically-confirmed-macroscopic-local-relapsed-prostate-cancer-after-radical-prostatectomy
#6
David Buchser, Alfonso Gomez-Iturriaga, J Ignacio Rodriguez Melcon, Francisco Casquero, Roberto Llarena, Jon Cacicedo, Pedro Bilbao
PURPOSE: To evaluate the feasibility of the use of real-time magnetic resonance imaging (MRI)-transrectal ultrasound (TRUS) fusion guided high-dose-rate brachytherapy (HDR-BT) +/- external beam radiation therapy (EBRT) in patients with histologically-proven local relapse after radical prostatectomy. MATERIAL AND METHODS: We retrospectively reviewed 13 patients treated with real-time MRI-TRUS fusion HDR-BT for a local relapse of prostate cancer after radical surgery...
December 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/28048721/su-f-j-222-using-pet-imaging-to-evaluate-proliferation-and-blood-flow-in-irradiated-and-non-irradiated-bone-marrow-1-year-after-chemoradiation-therapy
#7
S McGuire, L Ponto, Y Menda
PURPOSE: To compare proliferation and blood flow in pelvic and thoracic bone marrow 1 year after pelvic chemoradiation. METHODS: Sixteen pelvic cancer patients were enrolled in an IRB-approved protocol to acquire FLT PET images during radiation therapy simulation (baseline) and 1 year after chemoradiation therapy. Three subjects also had optional O-15 water PET images acquired 1 year after chemoradiation therapy. Baseline FLT PET images were used to create IMRT plans to spare pelvic bone marrow identified as regions with FLT SUV ≥ 2 without compromising PTV coverage or OAR sparing...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048133/su-f-j-113-multi-atlas-based-automatic-organ-segmentation-for-lung-radiotherapy-planning
#8
J Kim, J Han, S Ailawadi, J Baker, A Hsia, Z Xu, S Ryu
PURPOSE: Normal organ segmentation is one time-consuming and labor-intensive step for lung radiotherapy treatment planning. The aim of this study is to evaluate the performance of a multi-atlas based segmentation approach for automatic organs at risk (OAR) delineation. METHODS: Fifteen Lung stereotactic body radiation therapy patients were randomly selected. Planning CT images and OAR contours of the heart - HT, aorta - AO, vena cava - VC, pulmonary trunk - PT, and esophagus - ES were exported and used as reference and atlas sets...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047834/su-c-bra-04-automated-segmentation-of-head-and-neck-ct-images-for-radiotherapy-treatment-planning-via-multi-atlas-machine-learning-maml
#9
X Ren, G Sharp, H Gao
PURPOSE: Accurate image segmentation is a crucial step during image guided radiation therapy. This work proposes multi-atlas machine learning (MAML) algorithm for automated segmentation of head-and-neck CT images. METHODS: As the first step, the algorithm utilizes normalized mutual information as similarity metric, affine registration combined with multiresolution B-Spline registration, and then fuses together using the label fusion strategy via Plastimatch. As the second step, the following feature selection strategy is proposed to extract five feature components from reference or atlas images: intensity (I), distance map (D), box (B), center of gravity (C) and stable point (S)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047471/su-f-p-23-setup-uncertainties-for-the-lung-stereotactic-body-radiation-therapy
#10
Q Zhang, Y Cao, A Jamshidi, P Vigneri, C Madu, L Potters, E Klein
PURPOSE: The Exactrack X-ray system with six degree-of-freedom (6DoF) adjustment ability can be used for setup of lung stereotactic body radiation therapy. The setup uncertainties from ExacTrack 6D system were analyzed. METHODS: The Exactrack X-ray 6D image guided radiotherapy system is used in our clinic. The system is an integration of 2 subsystems: (1): an infrared based optical position system and (2) a radiography kV x-ray imaging system. The infrared system monitors reflective body markers on the patient's skin to assistant in the initial setup...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046310/th-cd-206-02-best-in-physics-imaging-3d-prostate-segmentation-in-mr-images-using-patch-based-anatomical-signature
#11
X Yang, A Jani, P Rossi, H Mao, W Curran, T Liu
PURPOSE: MRI has shown promise in identifying prostate tumors with high sensitivity and specificity for the detection of prostate cancer. Accurate segmentation of the prostate plays a key role various tasks: to accurately localize prostate boundaries for biopsy needle placement and radiotherapy, to initialize multi-modal registration algorithms or to obtain the region of interest for computer-aided detection of prostate cancer. However, manual segmentation during biopsy or radiation therapy can be time consuming and subject to inter- and intra-observer variation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27987612/magnetic-resonance-venography-and-three-dimensional-image-fusion-guidance-provide-a-novel-paradigm-for-endovascular-recanalization-of-chronic-central-venous-occlusion
#12
Adeline Schwein, Tony Lu, Ponraj Chinnadurai, Danai Kitkungvan, Dipan J Shah, Nabil Chakfe, Alan B Lumsden, Jean Bismuth
OBJECTIVE: Endovascular recanalization is considered first-line therapy for chronic central venous occlusion (CVO). Unlike arteries, in which landmarks such as wall calcifications provide indirect guidance for endovascular navigation, sclerotic veins without known vascular branching patterns impose significant challenges. Therefore, safe wire access through such chronic lesions mostly relies on intuition and experience. Studies have shown that magnetic resonance venography (MRV) can be performed safely in these patients, and the boundaries of occluded veins may be visualized on specific MRV sequences...
January 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/27966187/three-dimensional-image-fusion-guidance-of-percutaneous-pulmonary-valve-implantation-to-reduce-radiation-exposure-and-contrast-dose-a%C3%A2-comparison-with-traditional-two-dimensional-and-three-dimensional-rotational-angiographic-guidance
#13
S Goreczny, T Moszura, P Dryzek, M Lukaszewski, A Krawczuk, J Moll, G J Morgan
INTRODUCTION: Three-dimensional rotational angiography (3DRA) has been used in the guidance of various transcatheter therapies including percutaneous pulmonary valve implantation (PPVI). The most recently available 3D image fusion software (VesselNavigator, Philips) extends this technology to use pre-registered computed tomography or magnetic resonance imaging datasets, promising reductions in contrast and radiation exposure along with shorter procedural times. METHODS: In this retrospective review, patients were assigned to three groups according to the mode of imaging guidance: two-dimensional angiography (2DA), 3DRA and VesselNavigator (VN) assisted valve implantation...
February 2017: Netherlands Heart Journal
https://www.readbyqxmd.com/read/27847573/the-effect-of-perioperative-radiation-therapy-on-spinal-bone-fusion-following-spine-tumor-surgery
#14
Tae-Kyum Kim, Wonik Cho, Sang Min Youn, Ung-Kyu Chang
INTRODUCTION: Perioperative irradiation is often combined with spine tumor surgery. Radiation is known to be detrimental to healing process of bone fusion. We tried to investigate bone fusion rate in spine tumor surgery cases with perioperative radiation therapy (RT) and to analyze significant factors affecting successful bone fusion. METHODS: Study cohort was 33 patients who underwent spinal tumor resection and bone graft surgery combined with perioperative RT...
November 2016: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/27582607/mri-guided-prostate-biopsy-of-native-and-recurrent-prostate-cancer
#15
REVIEW
David A Woodrum, Krzysztof R Gorny, Bernadette Greenwood, Lance A Mynderse
Prostate cancer is the most commonly diagnosed noncutaneous cancer and second-leading cause of death in men. Many patients with clinically organ-confined prostate cancer undergo definitive, curative treatment of the whole gland with either radical prostatectomy or radiation therapy. However, many men are reluctant to take the definitive step due to potential morbidity associated with either therapy. A growing interest in active surveillance or focal therapy has emerged as realistic alternatives for many patients...
September 2016: Seminars in Interventional Radiology
https://www.readbyqxmd.com/read/27561802/-crizotinib-treatment-combined-with-resection-and-whole-brain-radiation-therapy-%C3%A2-in-a-ros1-rearranged-lung-adenocarcinoma-with-brain-metastasis-%C3%A2-case-report-and-literature-review
#16
Min Zhang, Ligong Nie, Jiayong Zhang
BACKGROUND: Lung cancer with brain metastasis had poor prognosis. Crizotinib had been confirmed to be used in ROS1 (C-ros oncogene 1 receptor tyrosine kinase) rearranged lung adenocarcinoma, but its efficacy in lung cancer with brain metastasis was poor due to the blood brain barrier. In the present study, we reported one case of ROS1 fusion lung adenocarcinoma with symptomatic brain matastasis, who was treated with brain metastases resection, crizotinib, and whole brain radiotherapy plus boost to residual brain metastasis...
August 20, 2016: Zhongguo Fei Ai za Zhi, Chinese Journal of Lung Cancer
https://www.readbyqxmd.com/read/27524504/atlas-guided-generation-of-pseudo-ct-images-for-mri-only-and-hybrid-pet-mri-guided-radiotherapy-treatment-planning
#17
Hossein Arabi, Nikolaos Koutsouvelis, Michel Rouzaud, Raymond Miralbell, Habib Zaidi
Magnetic resonance imaging (MRI)-guided attenuation correction (AC) of positron emission tomography (PET) data and/or radiation therapy (RT) treatment planning is challenged by the lack of a direct link between MRI voxel intensities and electron density. Therefore, even if this is not a trivial task, a pseudo-computed tomography (CT) image must be predicted from MRI alone. In this work, we propose a two-step (segmentation and fusion) atlas-based algorithm focusing on bone tissue identification to create a pseudo-CT image from conventional MRI sequences and evaluate its performance against the conventional MRI segmentation technique and a recently proposed multi-atlas approach...
September 7, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27512571/practice-patterns-of-radiation-therapy-technology-in-australia-results-of-a-national-audit
#18
Pete Bridge, Shane Dempsey, Eileen Giles, Sharon Maresse, Giulia McCorkell, Craig Opie, Caroline Wright, Mary-Ann Carmichael
INTRODUCTION: This article presents the results of a single-day census of radiation therapy (RT) treatment and technology use in Australia. The primary aim of the study was to ascertain patterns of RT practice and technology in use across Australia. These data were primarily collated to inform curriculum development of academic programs, thereby ensuring that training is matched to workforce patterns of practice. METHODS: The study design was a census method with all 59 RT centres in Australia being invited to provide quantitative summary data relating to patient case mix and technology use on a randomly selected but common date...
December 2015: Journal of Medical Radiation Sciences
https://www.readbyqxmd.com/read/27504134/single-fraction-multimodal-image-guided-focal-salvage-high-dose-rate-brachytherapy-for-recurrent-prostate-cancer
#19
Constantinos Zamboglou, Hans-Christian Rischke, Philipp Tobias Meyer, Sven Knobe, Natalja Volgeova-Neher, Michael Kollefrath, Cordula Annette Jilg, Anca Ligia Grosu, Dimos Baltas, Malte Kroenig
PURPOSE: We present a novel method for treatment of locally recurrent prostate cancer (PCa) following radiation therapy: focal, multimodal image guided high-dose-rate (HDR) brachytherapy. MATERIAL AND METHODS: We treated two patients with recurrent PCa after primary (#1) or adjuvant (#2) external beam radiation therapy. Multiparametric magnetic resonance imaging (mpMRI), choline, positron emission tomography combined with computed tomography (PET/CT), or prostate-specific membrane antigen (PSMA)-PET combined with CT identified a single intraprostatic lesion...
June 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/27277039/minimizing-treatment-planning-errors-in-proton-therapy-using-failure-mode-and-effects-analysis
#20
Yuanshui Zheng, Randall Johnson, Gary Larson
PURPOSE: Failure mode and effects analysis (FMEA) is a widely used tool to evaluate safety or reliability in conventional photon radiation therapy. However, reports about FMEA application in proton therapy are scarce. The purpose of this study is to apply FMEA in safety improvement of proton treatment planning at their center. METHODS: The authors performed an FMEA analysis of their proton therapy treatment planning process using uniform scanning proton beams. The authors identified possible failure modes in various planning processes, including image fusion, contouring, beam arrangement, dose calculation, plan export, documents, billing, and so on...
June 2016: Medical Physics
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