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Image Guidance

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https://www.readbyqxmd.com/read/27913350/guided-wavelet-shrinkage-for-edge-aware-smoothing
#1
Guang Deng
Edge-aware smoothing has been extensively studied due to its wide range of applications in computer vision and graphics.Most published works have been focused on formulating the smoothing problem in the spatial domain. In this paper, we propose a new edge-aware smoothing framework called guided wavelet shrinkage (GWS) which is formulated in the wavelet domain as a maximum a posterior estimation problem. We impose a number of desirable properties on the statistical models and the associated parameters in order to derive an effective and computationally efficient algorithm...
December 1, 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/27912788/osteoid-osteoma-of-the-acetabulum-successfully-treated-with-computed-tomography-guided-resection-and-ablation-using-a-standard-electrosurgical-generator-a-case-report
#2
Kazutaka Kikuta, Sota Oguro, Tatsuya Yamamoto, Tetsuya Sekita, Sayaka Yamaguchi, Michiro Susa, Kazumasa Nishimoto, Masanori Inoue, Seishi Nakatsuka, Aya Sasaki, Kaori Kameyama, Masaya Nakamura, Morio Matsumoto, Hideo Morioka
BACKGROUND: Osteoid osteoma accounts for approximately 10% of all benign bone tumors. The most common sites of osteoid osteoma are the subcortical shaft and metaphyses of long bones, but any other skeletal bone site can be involved. The acetabulum is a rare site according to past reports. This site presents challenges to optimal management because it is anatomically difficult to approach, and because its rarity leads to limited experience with therapeutic procedures. Here, we report for the first time a rare case of osteoid osteoma in the acetabulum that was successfully treated via resection of the nidus and ablation using a standard electrosurgical generator under computed tomographic guidance...
December 3, 2016: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/27909957/adaptive-radiation-therapy-in-head-and-neck-cancer-for-clinical-practice-state-of-the-art-and-practical-challenges
#3
REVIEW
Ovidiu Veresezan, Idriss Troussier, Alexis Lacout, Sarah Kreps, Sophie Maillard, Aude Toulemonde, Pierre-Yves Marcy, Florence Huguet, Juliette Thariat
Modern radiation therapy techniques are characterized by high conformality to tumor volumes and steep dose gradients to spare normal organs. These techniques require accurate clinical target volume definitions and rigorous assessment of set up uncertainties using image guidance, a concept called image-guided radiation therapy. Due to alteration of patient anatomy, changes in tissue density/volumes and tumor shrinkage over the course of treatment, treatment accuracy may be challenged. This may result in excessive irradiation of organs at risk/healthy tissues and undercoverage of target volumes with a significant risk of locoregional failure...
December 1, 2016: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/27909659/reliability-of-the-planned-pedicle-screw-trajectory-versus-the-actual-pedicle-screw-trajectory-using-intra-operative-3d-ct-and-image-guidance
#4
Catherine A Miller, Charles G Ledonio, Matthew A Hunt, Farhan Siddiq, David W Polly
BACKGROUND: Technological advances, including navigation, have been made to improve safety and accuracy of pedicle screw fixation. We evaluated the accuracy of the virtual screw placement (Stealth projection) compared to actual screw placement (intra-operative O-Arm) and examined for differences based on the distance from the reference frame. METHODS: A retrospective evaluation of prospectively collected data was conducted from January 2013 to September 2013. We evaluated thoracic and lumbosacral pedicle screws placed using intraoperative O-arm and Stealth navigation by obtaining virtual screw projections and intraoperative O-arm images after screw placement...
2016: International Journal of Spine Surgery
https://www.readbyqxmd.com/read/27908185/a-comparison-of-linear-interpolation-models-for-iterative-ct-reconstruction
#5
Katharina Hahn, Harald Schöndube, Karl Stierstorfer, Joachim Hornegger, Frédéric Noo
PURPOSE: Recent reports indicate that model-based iterative reconstruction methods may improve image quality in computed tomography (CT). One difficulty with these methods is the number of options available to implement them, including the selection of the forward projection model and the penalty term. Currently, the literature is fairly scarce in terms of guidance regarding this selection step, whereas these options impact image quality. Here, the authors investigate the merits of three forward projection models that rely on linear interpolation: the distance-driven method, Joseph's method, and the bilinear method...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908166/improved-targeting-accuracy-of-lung-tumor-biopsies-with-scanning-beam-digital-x-ray-tomosynthesis-image-guidance
#6
Geoff Nelson, Meng Wu, Cameron Hinkel, Ganesh Krishna, Tobias Funk, Jarrett Rosenberg, Rebecca Fahrig
PURPOSE: Electromagnetic navigation bronchoscopy (ENB) provides improved targeting accuracy during transbronchial biopsies of suspicious nodules. The greatest weakness of ENB-based guidance is the registration divergence that exists between the planning CT, acquired days or weeks before the intervention, and the patient on the table on the day of the intervention. Augmenting ENB guidance with real-time tomosynthesis imaging during the intervention could mitigate the divergence and further improve the yield of ENB-guided transbronchial biopsies...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908163/learning-based-3t-brain-mri-segmentation-with-guidance-from-7t-mri-labeling
#7
Minghui Deng, Renping Yu, Li Wang, Feng Shi, Pew-Thian Yap, Dinggang Shen
PURPOSE: Segmentation of brain magnetic resonance (MR) images into white matter (WM), gray matter (GM), and cerebrospinal fluid (CSF) is crucial for brain structural measurement and disease diagnosis. Learning-based segmentation methods depend largely on the availability of good training ground truth. However, the commonly used 3T MR images are of insufficient image quality and often exhibit poor intensity contrast between WM, GM, and CSF. Therefore, they are not ideal for providing good ground truth label data for training learning-based methods...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27906943/fluoroscopic-sacroiliac-joint-injection-is-oblique-angulation-really-necessary
#8
Sandeep Khuba, Anil Agarwal, Sujeet Gautam, Sanjay Kumar
BACKGROUND: The conventional technique for sacroiliac (SI) joint injection involves aligning the anterior and posterior aspects of the SI joint under fluoroscopic guidance and then entering the SI joint in the most caudal aspect. OBJECTIVE: We wish to highlight that there is no added advantage to aligning both the anterior and posterior joint lines of the SI joint as it is time consuming, associated with additional radiation exposure, and may make the entry into the posterior SI joint technically more difficult...
November 2016: Pain Physician
https://www.readbyqxmd.com/read/27904451/the-ratio-of-weight-loss-to-planning-target-volume-significantly-impacts-setup-errors-in-nasopharyngeal-cancer-patients-undergoing-helical-tomotherapy-with-daily-megavoltage-computed-tomography
#9
Wei-Hsien Hou, Chun-Wei Wang, Chiao-Ling Tsai, Feng-Ming Hsu, Jason Chia-Hsien Cheng
BACKGROUND: Changes in head and neck anatomy during radiation therapy (RT) produce setup uncertainties of nasopharyngeal cancer (NPC) irradiation. We retrospectively analyzed image guidance data to identify clinical predictors of setup errors. PATIENTS AND METHODS: The data of 217 NPC patients undergoing definitive RT on a helical tomotherapy (HT) unit were analyzed. Factors including tumor stage, body mass index, weight loss, and planning target volume (PTV) were assessed as predictors of daily megavoltage computed tomography (MVCT) setup displacements, which were automatically registered using software...
December 1, 2016: Radiology and Oncology
https://www.readbyqxmd.com/read/27904217/percutaneous-vertebroplasty-guided-by-preoperative-computed-tomography-measurements
#10
Zhongbao Tan, Zhenhai Di, Xuequn Mao, Jian Zhang, Rong Zou, Qingqing Wang
BACKGROUND: Percutaneous vertebroplasty (PVP) is now widely performed to treat painful vertebral compression fractures. Previous researches have reported numerous advantages. However, it rarely reported that how to determine the feasibility of the unilateral or bilateral approach and how to decide the puncture angle, the skin insertion site before the procedure. The aim of this study was to discuss the feasibility of PVP using unilateral pedicular approach by the three-dimensional positioning of computed tomography (CT) image...
November 2016: Indian Journal of Orthopaedics
https://www.readbyqxmd.com/read/27903005/vanishing-point-attracts-gaze-in-free-viewing-and-visual-search-tasks
#11
Ali Borji, Mengyang Feng, Huchuan Lu
Several structural scene cues such as gist, layout, horizontal line, openness, and depth have been shown to guide scene perception (e.g., Oliva & Torralba, 2001); Ross & Oliva, 2009). Here, to investigate whether vanishing point (VP) plays a significant role in gaze guidance, we ran two experiments. In the first one, we recorded fixations of 10 observers (six male, four female; mean age 22; SD = 0.84) freely viewing 532 images, out of which 319 had a VP (shuffled presentation; each image for 4 s). We found that the average number of fixations at a local region (80 × 80 pixels) centered at the VP is significantly higher than the average fixations at random locations (t test; n = 319; p < 0...
November 1, 2016: Journal of Vision
https://www.readbyqxmd.com/read/27900591/treatment-of-lung-tumours-with-high-energy-microwave-ablation-a-single-centre-experience
#12
Anna Maria Ierardi, Andrea Coppola, Natalie Lucchina, Gianpaolo Carrafiello
The purpose of our study is to report safety, technical success, effectiveness, local progression-free survival (LPFS) and overall survival of percutaneous microwave ablation (MWA) to treat lung tumours unsuitable for surgery. Nineteen patients with thirty-one tumours (mean diameter 2.4 cm) underwent percutaneous MWA in 28 sessions. Microwave ablation was carried out using a 2450-MHz generator (Emprint/Covidien, Boulder, CO, USA). Procedures were performed under cone-beam CT (CBCT) and under fluoro-CT (one session) guidance...
January 2017: Medical Oncology
https://www.readbyqxmd.com/read/27898067/the-need-for-multidisciplinarity-in-specialist-training-to-optimize-future-patient-care
#13
REVIEW
Alison C Tree, Victoria Harding, Aneel Bhangu, Venkatesh Krishnasamy, Dion Morton, Justin Stebbing, Bradford J Wood, Ricky A Sharma
Harmonious interactions between radiation, medical, interventional and surgical oncologists, as well as other members of multidisciplinary teams, are essential for the optimization of patient care in oncology. This multidisciplinary approach is particularly important in the current landscape, in which standard-of-care approaches to cancer treatment are evolving towards highly targeted treatments, precise image guidance and personalized cancer therapy. Herein, we highlight the importance of multidisciplinarity and interdisciplinarity at all levels of clinical oncology training...
November 29, 2016: Nature Reviews. Clinical Oncology
https://www.readbyqxmd.com/read/27896519/image-guidance-technology-and-the-surgical-resection-of-spinal-column-tumors
#14
REVIEW
Bhargav Desai, Jonathan Hobbs, Grant Hartung, Guoren Xu, Ziya L Gokaslan, Andreas Linninger, Ankit I Mehta
Precision imaging is paramount to achieving success in surgical resection of many spinal tumors, whether the goal involves guiding a surgical cure for primary tumors or improving neurological decompression for metastatic lesions. Pre-operatively, image visualization is intimately involved with defining a clear target and surgical planning. Intra-operatively, image-guidance technology allows for surgeons to maximize the probability for gross total resection of spinal cord tumors and minimize damage to adjacent structures...
November 28, 2016: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/27895412/metabolic-imaging-for-guidance-of-curative-treatment-of-isolated-pelvic-implantation-metastasis-after-resection-of-spontaneously-ruptured-hepatocellular-carcinoma-a-case-report
#15
Bing Hao, Wei Guo, Na-Na Luo, Hao Fu, Hao-Jun Chen, Long Zhao, Hua Wu, Long Sun
Spontaneous rupture of hepatocellular carcinoma (HCC) is a life-threatening complication and its prognosis is significantly poor because of the high recurrence rate after initial hepatectomy. Resection of isolated extrahepatic metastasis of HCC has been advocated to obtain a possibility of long-term survival. However, it is a challenge for clinicians to detect implantation metastasis of spontaneously ruptured HCC. Accurate re-staging plays the most important role in making a decision on isolated metastasis resection...
November 7, 2016: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/27893373/robust-color-guided-depth-map-restoration
#16
Wei Liu, Xiaogang Chen, Jie Yang, Qiang Wu
One of the most challenging issues in color guided depth map restoration is the inconsistency between color edges in guidance color images and depth discontinuities on depth maps. This makes the restored depth map suffer from texture copy artifacts and blurring depth discontinuities. To handle this problem, most state-of-the-art methods design complex guidance weight based on guidance color images and heuristically make use of the bicubic interpolation of the input depth map. In this paper, we show that using bicubic interpolated depth map can blur depth discontinuities when the upsampling factor is large and the input depth map contains large holes and heavy noise...
January 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/27891213/uk-guidelines-for-the-management-of-soft-tissue-sarcomas
#17
REVIEW
Adam Dangoor, Beatrice Seddon, Craig Gerrand, Robert Grimer, Jeremy Whelan, Ian Judson
Soft tissue sarcomas (STS) are rare tumours arising in mesenchymal tissues, and can occur almost anywhere in the body. Their rarity, and the heterogeneity of subtype and location means that developing evidence-based guidelines is complicated by the limitations of the data available. However, this makes it more important that STS are managed by teams, expert in such cases, to ensure consistent and optimal treatment, as well as recruitment to clinical trials, and the ongoing accumulation of further data and knowledge...
2016: Clinical Sarcoma Research
https://www.readbyqxmd.com/read/27891055/imaging-guidance-improves-the-results-of-viscosupplementation-with-hanox-m-xl-in-patients-with-ankle-osteoarthritis-results-of-a-clinical-survey-in-50-patients-treated-in-daily-practice
#18
Marie Bossert, Daniel Boublil, Jean-Marc Parisaux, Ana-Maria Bozgan, Emmanuel Richelme, Thierry Conrozier
BACKGROUND: The objective of this survey was to assess retrospectively the interest of performing viscosupplementation using imaging guidance in patients suffering from ankle osteoarthritis (OA). PATIENTS AND METHODS: This is a multicenter retrospective survey using a standardized questionnaire. Fifty patients suffering from ankle OA and treated, in daily clinical practice, with a single intra-articular injection of a novel viscosupplement made of a combination of a non-animal cross-linked hyaluronan and mannitol, HANOX M-XL, were included in the survey...
2016: Clinical Medicine Insights. Arthritis and Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27890185/high-resolution-three-dimensional-mr-imaging-of-the-skull-base-compartments-boundaries-and-critical-structures
#19
REVIEW
Ari Meir Blitz, Nafi Aygun, Daniel A Herzka, Masaru Ishii, Gary L Gallia
High-resolution 3D MRI of the skull base allows for a more detailed and accurate assessment of normal anatomic structures as well as the location and extent of skull base pathologies than has previously been possible. This article describes the techniques employed for high-resolution skull base MRI including pre- and post-contrast constructive interference in the steady state (CISS) imaging and their utility for evaluation of the many small structures of the skull base, focusing on those regions and concepts most pertinent to localization of cranial nerve palsies and in providing pre-operative guidance and post-operative assessment...
January 2017: Radiologic Clinics of North America
https://www.readbyqxmd.com/read/27885379/preoperative-radioactive-seed-localization-of-nonpalpable-soft-tissue-masses-an-established-localization-technique-with-a-new-application
#20
Hillary W Garner, Joseph M Bestic, Jeffrey J Peterson, Steven Attia, Daniel E Wessell
OBJECTIVE: To describe the technique of iodine(125) (I(125)) seed deployment into nonpalpable soft tissue masses under direct ultrasound (US) or CT guidance for intraoperative localization. MATERIALS AND METHODS: Patients considered candidates for radioactive seed localization (RSL) based on advanced imaging findings underwent an ultrasound examination of the area of concern to verify sonographic visualization of the targeted mass. If the mass was not visible sonographically, CT was used for guidance...
November 24, 2016: Skeletal Radiology
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