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Cone beam CT

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https://www.readbyqxmd.com/read/28635238/-comparison-of-vacuum-bag-fixation-and-orfit-rack-with-thermoplastic-membrane-fixation-for-image-guided-cervical-cancer-radiotherapy
#1
Y B Li, Y L Wang, Y H Zhuo
Objective: To compare the difference of displacement between the vacuum bag fixation and the Orfit rack with thermoplastic membrane fixation of the cervical cancer patients, and to explore the individual fixation of the patients. Methods: We retrospectively analyzed the clinical data of 66 patients diagnosed as cervical cancer in Zhangzhou Municipal Hospital of Fujian Province from December 2014 to April 2016. Among them, 33 patients were fixed with vacuum bag, 33 patients were fixed with the Orfit rack with thermoplastic membrane...
June 23, 2017: Zhonghua Zhong Liu za Zhi [Chinese Journal of Oncology]
https://www.readbyqxmd.com/read/28627007/optical-molecular-imaging-guided-radiation-therapy-part-1-integrated-x-ray-and-bioluminescence-tomography
#2
Junwei Shi, Thirupandiyur S Udayakumar, Zhiqun Wang, Nesrin Dogan, Alan Pollack, Yidong Yang
PURPOSE: X-ray CT faces challenges in differentiating tumors from surrounding healthy tissues. A bioluminescence tomography (BLT) system which can directly reconstruct the internal luminescent tumors, was developed and integrated with CT system to accurately guide radiation dose delivery. METHODS: The BLT system, employing a lens-coupled CCD camera, was physically registered with an onboard cone beam CT system in an image guided small animal arc radiation treatment system (iSMAART)...
June 19, 2017: Medical Physics
https://www.readbyqxmd.com/read/28626876/optical-molecular-imaging-guided-radiation-therapy-part-2-integrated-x-ray-and-fluorescence-molecular-tomography
#3
Junwei Shi, Thirupandiyur S Udayakumar, Zhiqun Wang, Nesrin Dogan, Alan Pollack, Yidong Yang
PURPOSE: Differentiating tumor from its surrounding soft tissues is challenging for x-ray computed tomography (CT). Fluorescence molecular tomography (FMT) can directly localize the internal tumors targeted with specific fluorescent probes. A FMT system was developed and integrated onto a CT guided irradiator to improve tumor localization for image guided radiation. METHODS: The FMT system was aligned orthogonal to the cone beam CT onboard our previously developed image guided small animal arc radiation treatment system (iSMAART)...
June 19, 2017: Medical Physics
https://www.readbyqxmd.com/read/28609790/analysis-of-patients-x-ray-exposure-in-146-percutaneous-radiologic-gastrostomies
#4
Tim Ole Petersen, Martin Reinhardt, Jochen Fuchs, Dieter Gosch, Alexey Surov, Patrick Stumpp, Thomas Kahn, Michael Moche
Purpose Analysis of patient´s X-ray exposure during percutaneous radiologic gastrostomies (PRG) in a larger population. Materials and Methods Data of primary successful PRG-procedures, performed between 2004 and 2015 in 146 patients, were analyzed regarding the exposition to X-ray. Dose-area-product (DAP), dose-length-product (DLP) respectively, and fluoroscopy time (FT) were correlated with the used x-ray systems (Flatpanel Detector (FD) vs. Image Itensifier (BV)) and the necessity for periprocedural placement of a nasogastric tube...
June 13, 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/28600917/application-of-combined-osteotomy-and-reconstruction-pre-bent-plate-position-corppp-technology-to-assist-in-the-precise-reconstruction-of-segmental-mandibular-defects
#5
Ye Liang, Canhua Jiang, Limeng Wu, Wenjin Wang, Yonggang Liu, Xinchun Jian
PURPOSE: To introduce and evaluate the clinical effects of digital surgical guide plate technology in the combined osteotomy and reconstruction pre-bent plate position (CORPPP) technique during mandibular segmental resections. MATERIALS AND METHODS: Seven cases of mandibular segmental resection with simultaneous vascularized free fibula flap reconstruction by oral and maxillofacial surgery were selected (Xiangya Hospital, Changsha, China; June 2015 through December 2015)...
May 15, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28598860/translational-motion-correction-algorithm-for-truncated-cone-beam-ct-using-opposite-projections
#6
Jawook Gu, Woong Bae, Jong Chul Ye
BACKGROUND: Cone-beam computed tomography (CBCT) is widely used in various medical imaging applications, including dental examinations. Dental CBCT images often suffer from motion artifacts caused by involuntary rigid motion of patients. However, earlier motion compensation studies are not applicable for dental CBCT systems using truncated detectors. OBJECTIVE: This study proposes a novel motion correction algorithm that can be applied for truncated dental CBCT images...
June 3, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28598292/effects-of-primary-and-recurrent-sacral-chordoma-on-the-motor-and-nociceptive-function-of-hindlimbs-in-rats-an-orthotopic-spine-model
#7
Rachel Sarabia-Estrada, Alejandro Ruiz-Valls, Sagar R Shah, A Karim Ahmed, Alvaro A Ordonez, Fausto J Rodriguez, Hugo Guerrero-Cazares, Ismael Jimenez-Estrada, Esteban Velarde, Betty Tyler, Yuxin Li, Neil A Phillips, C Rory Goodwin, Rory J Petteys, Sanjay K Jain, Gary L Gallia, Ziya L Gokaslan, Alfredo Quinones-Hinojosa, Daniel M Sciubba
OBJECTIVE Chordoma is a slow-growing, locally aggressive cancer that is minimally responsive to conventional chemotherapy and radiotherapy and has high local recurrence rates after resection. Currently, there are no rodent models of spinal chordoma. In the present study, the authors sought to develop and characterize an orthotopic model of human chordoma in an immunocompromised rat. METHODS Thirty-four immunocompromised rats were randomly allocated to 4 study groups; 22 of the 34 rats were engrafted in the lumbar spine with human chordoma...
June 9, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28595774/feasibility-of-using-single-photon-counting-x-ray-for-lung-tumor-position-estimation-based-on-4d-ct
#8
Katharina P Aschenbrenner, Christian V Guthier, Yulia Lyatskaya, Judit Boda-Heggemann, Frederik Wenz, Jürgen W Hesser
PURPOSE: In stereotactic body radiation therapy of lung tumors, reliable position estimation of the tumor is necessary in order to minimize normal tissue complication rate. While kV X-ray imaging is frequently used, continuous application during radiotherapy sessions is often not possible due to concerns about the additional dose. Thus, ultra low-dose (ULD) kV X-ray imaging based on a single photon counting detector is suggested. This paper addresses the lower limit of photons to locate the tumor reliably with an accuracy in the range of state-of-the-art methods, i...
June 5, 2017: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/28590940/simdosect-dose-reporting-software-based-on-monte-carlo-simulation-for-a-320-detector-row-cone-beam-ct-scanner-and-icrp-computational-adult-phantoms
#9
Maria Cros, Raoul Joemai, Jacob Koos Geleijns, Diego Molina, Marçal Salvadó
This study aims to develop and test software for assessing and reporting doses for standard patients undergoing computed tomography (CT) examinations in a 320 detector-row cone-beam scanner. The software, called SimDoseCT, is based on Monte Carlo (MC) simulation code, which was developed to calculate organ- and effective doses in ICRP anthropomorphic adult reference computational phantoms for acquisitions with the Aquilion ONE CT scanner (Toshiba). MC simulation was validated by comparing CTDI measurements within standard CT dose phantoms with results from simulation under the same conditions...
June 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28585520/iterative-image-domain-ring-artifact-removal-in-cone-beam-ct
#10
Xiaokun Liang, Zhicheng Zhang, Tianye Niu, Shaode Yu, Shibin Wu, Zhicheng Li, Huailing Zhang, Yaoqin Xie
Ring artifacts in cone beam computed tomography (CBCT) images are caused by pixel gain variations using flat-panel detectors, and may lead to structured non-uniformities and deterioration of image quality. The purpose of this study is to propose a method of general ring artifact removal in CBCT images. This method is based on the polar coordinate system, where the ring artifacts manifest as stripe artifacts. Using relative total variation, the CBCT images are first smoothed to generate template images with fewer image details and ring artifacts...
July 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28582954/virtual-scatter-modulation-for-x-ray-ct-scatter-correction-using-primary-modulator
#11
Hewei Gao, Lei Zhu, Rebecca Fahrig
A new scatter estimation algorithm with a concept of virtual scatter modulation for X-ray scatter correction using primary modulator is proposed to reduce the aliasing errors in the estimated scatter. Virtual scatter modulation can be realized through dividing the measured primary-modulated image by the measured modulation function. After the division, the aggravation of the aliasing of primary due to the non-uniformity of the modulation function is largely transferred to that of scatter. Since scatter in general has less high frequencies than primary does, the aggravation of its aliasing is expected to be weaker, and therefore the overall aliasing can be reduced...
May 31, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28579281/interfractional-variability-of-respiration-induced-esophageal-tumor-motion-quantified-using-fiducial-markers-and-four-dimensional-cone-beam-computed-tomography
#12
Peng Jin, Maarten C C M Hulshof, Niek van Wieringen, Arjan Bel, Tanja Alderliesten
PURPOSE: To investigate the interfractional variability of respiration-induced esophageal tumor motion using fiducial markers and four-dimensional cone-beam computed tomography (4D-CBCT) and assess if a 4D-CT is sufficient for predicting the motion during the treatment. MATERIALS AND METHODS: Twenty-four patients with 63 markers visible in the retrospectively reconstructed 4D-CBCTs were included. For each marker, we calculated the amplitude and trajectory of the respiration-induced motion...
June 1, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28571704/percutaneous-radiofrequency-ablation-of-lung-metastases-from-colorectal-carcinoma-under-c-arm-cone-beam-ct-guidance
#13
G Amouyal, S Pernot, C Déan, B Cholley, F Scotté, M Sapoval, O Pellerin
PURPOSE: The aim of this study was to assess the feasibility, safety and efficacy of percutaneous radiofrequency ablation of lung metastases from colorectal carcinoma using C-arm cone beam computed tomography (CBCT) guidance. MATERIAL AND METHODS: This single-center prospective observational study was performed from August 2013 to August 2016, and included consecutive patients referred for radiofrequency ablation of lung metastases from colorectal cancer. Radiofrequency ablation procedures were performed under C-arm CBCT guidance...
May 29, 2017: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/28571091/cone-beam-ct-of-trauma-of-small-bones-and-joints
#14
Filip M Vanhoenacker, Julie Desimpel
No abstract text is available yet for this article.
July 2017: Seminars in Musculoskeletal Radiology
https://www.readbyqxmd.com/read/28560241/single-view-geometric-calibration-for-c-arm-inverse-geometry-ct
#15
Jordan M Slagowski, David A P Dunkerley, Charles R Hatt, Michael A Speidel
Accurate and artifact-free reconstruction of tomographic images requires precise knowledge of the imaging system geometry. A projection matrix-based calibration method to enable C-arm inverse geometry CT (IGCT) is proposed. The method is evaluated for scanning-beam digital x-ray (SBDX), a C-arm mounted inverse geometry fluoroscopic technology. A helical configuration of fiducials is imaged at each gantry angle in a rotational acquisition. For each gantry angle, digital tomosynthesis is performed at multiple planes and a composite image analogous to a cone-beam projection is generated from the plane stack...
January 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28553413/dentofacial-deformity-caused-by-bulky-osteochondroma-report-of-an-unusual-case-and-the-importance-of-cone-beam-computed-tomography
#16
Weeraya Tantanapornkul, Kittipong Dhanuthai, Phonkit Sinpitaksakul, Chumpot Itthichaisri, Paksinee Kamolratanakul, Vacharee Changsirivatanathamrong
INTRODUCTION: Osteochondroma of mandibular condyle is a rare benign tumor. CASE REPORT: This case report described clinical, radiographic features, differential diagnosis, histopathologic correlation and treatment of condylar osteochondroma. CONCLUSION: Conebeam computed tomography (CBCT) is an alternative modality to CT or MRI that should be performed in all cases of suspected osteochondroma of the mandibular condyle.
2017: Open Dentistry Journal
https://www.readbyqxmd.com/read/28535919/precision-iort-image-guided-intraoperative-radiation-therapy-igiort-using-online-treatment-planning-including-tissue-heterogeneity-correction
#17
Frank Schneider, Frederic Bludau, Sven Clausen, Jens Fleckenstein, Udo Obertacke, Frederik Wenz
BACKGROUND: To the present date, IORT has been eye and hand guided without treatment planning and tissue heterogeneity correction. This limits the precision of the application and the precise documentation of the location and the deposited dose in the tissue. Here we present a set-up where we use image guidance by intraoperative cone beam computed tomography (CBCT) for precise online Monte Carlo treatment planning including tissue heterogeneity correction. MATERIALS AND METHODS: An IORT was performed during balloon kyphoplasty using a dedicated Needle Applicator...
May 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28532606/verifying-tumor-position-during-stereotactic-body-radiation-therapy-delivery-using-limited-arc-cone-beam-computed-tomography-imaging
#18
Colien Hazelaar, Max Dahele, Stefan Scheib, Ben J Slotman, Wilko F A R Verbakel
BACKGROUND AND PURPOSE: Proof of tumor position during stereotactic body radiotherapy (SBRT) delivery is desirable. We investigated if cone-beam CT (CBCT) scans reconstructed from (collimated) fluoroscopic kV images acquired during irradiation could show the dominant tumor position. MATERIALS AND METHODS: Full-arc CBCT scans were reconstructed using FDK filtered back projection from 38kV fluoroscopy datasets (16 patients) continuously acquired during volumetric modulated spine SBRT...
May 19, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28528479/accuracy-of-a-new-intraoperative-cone-beam-ct-imaging-technique-artis-zeego-ii-compared-to-postoperative-ct-scan-for-assessment-of-pedicle-screws-placement-and-breaches-detection
#19
Virginie Cordemans, Ludovic Kaminski, Xavier Banse, Bernard G Francq, Olivier Cartiaux
PURPOSE: The goal of this study was to compare the accuracy of a novel intraoperative cone beam computed tomography (CBCT) imaging technique with that of conventional computed tomography (CT) scans for assessment of pedicle screw placement and breach detection. METHODS: Three hundred and forty-eight pedicle screws were inserted in 58 patients between October 2013 and March 2016. All patients had an intraoperative CBCT scan and a conventional CT scan to verify the placement of the screws...
May 20, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28527036/osteogenesis-ability-of-cad-cam-porous-zirconia-scaffolds-enriched-with-nano-hydroxyapatite-particles
#20
Moustafa N Aboushelib, Rehab Shawky
BACKGROUND: The aim of this study was to evaluate osteogenesis ability of CAD/CAM porous zirconia scaffolds enriched with hydroxy apatite used to augment large boney defects in a dog model. METHODS: Surgical defects were made bilaterally on the lower jaw of 12 Beagle dogs. Cone beam CT images were used to create three dimensional images of the healed defects. Porous zirconia scaffolds were fabricated by milling custom made CAD/CAM blocks into the desired shape. After sintering, the pores of half of the scaffolds were filled with a nano-hydroxy apatite (HA) powder while the other half served as control...
December 2017: International Journal of Implant Dentistry
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