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Four dimensional ct

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https://www.readbyqxmd.com/read/29772057/a-4d-global-respiratory-motion-model-of-the-thorax-based-on-ct-images-a-proof-of-concept
#1
H Fayad, M Gilles, T Pan, D Visvikis
PURPOSE: Respiratory motion reduces the sensitivity and specificity of medical images especially in the thoracic and abdominal areas. It may affect applications such as cancer diagnostic imaging and/or radiation therapy (RT). Solutions to this issue include modelling of the respiratory motion in order to optimize both diagnostic and therapeutic protocols. Personalised motion modeling required patient specific four dimensional (4D) imaging which in the case of 4D computed tomography (4D CT) acquisition is associated with an increased dose...
May 17, 2018: Medical Physics
https://www.readbyqxmd.com/read/29763951/dynamic-4d-ct-angiography-for-guiding-transarterial-chemoembolization-impact-on-the-reduction-of-contrast-material-operator-radiation-exposure-catheter-consumption-and-diagnostic-confidence
#2
Moritz H Albrecht, Thomas J Vogl, Julian L Wichmann, Simon S Martin, Jan-Erik Scholtz, Sebastian Fischer, Renate M Hammerstingl, Marc Harth, Nour-Eldin A Nour-Eldin, Axel Thalhammer, Stephan Zangos, Ralf W Bauer
PURPOSE:  This study was carried out to investigate the impact of abdominal dynamic four-dimensional CT angiography (4D-CTA) for guiding transarterial chemoembolization (TACE) on the amount of contrast material used, operator radiation exposure, catheter consumption, and diagnostic confidence. MATERIALS AND METHODS:  Written consent was waived for this IRB-approved retrospective study. 29 patients (20 men; mean age: 65.7 ± 11.5 years) with malignant liver lesions underwent 4D-CTA, prior to initial TACE...
June 2018: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/29763505/influence-of-alveolar-bone-defects-on-the-stress-distribution-in-quad-zygomatic-implant-supported-maxillary-prosthesis
#3
Yuanyuan Duan, Ravi Chandran, Denise Cherry
PURPOSE: The purpose of this study was to create three-dimensional composite models of quad zygomatic implant-supported maxillary prostheses with a variety of alveolar bone defects around implant sites, and to investigate the stress distribution in the surrounding bone using the finite element analysis (FEA) method. MATERIALS AND METHODS: Three-dimensional models of titanium zygomatic implants, maxillary prostheses, and human skulls were created and assembled using Mimics based on microcomputed tomography and cone beam computed tomography images...
May 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29761989/-super-resolution-reconstruction-for-lung-four-dimensional-computed-tomography-images-using-multi-model-gaussian-process-regression
#4
Shiting Fang, Tao Zhong, Jin Chen, Yu Zhang
Lung four dimensional computed tomography (4D-CT) can lead to accurate radiotherapy. However, for the safety of patients, the scan spacing of 4D-CT cannot be too small so that the inter-slice resolution of lung 4D-CT is low, and thus the coronal and sagittal images need to be interpolated to obtain high-resolution images. This paper presents a super-resolution reconstruction technique based on multi-model Gaussian process regression. We use the high-resolution transversal images and the corresponding low-resolution images as the training sets...
December 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29759906/determining-glenoid-component-version-after-total-shoulder-arthroplasty
#5
Manish P Mehta, Laura A Vogel, Brian B Shiu, Elizabeth R Dennis, Djuro Petkovic, William N Levine, Charles M Jobin
BACKGROUND: Glenoid component loosening after total shoulder arthroplasty (TSA) may occur if retroversion is not corrected to <10°. However, accurately measuring postoperative glenoid component version has been difficult without postoperative computed tomography (CT), adding cost and radiation exposure outside of the standard radiographic follow-up. We present a new method to assess glenoid component version after TSA using only routine preoperative CT and postoperative radiographs (x-rays)...
May 11, 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29757472/technical-note-predicting-dose-distribution-with-replacing-stopping-power-ratio-for-inter-fractional-motion-and-intra-fractional-motion-during-carbon-ion-radiotherapy-with-passive-irradiation-method-for-stage-i-lung-cancer
#6
Yoshiki Kubota, Makoto Sakai, Mutsumi Tashiro, Jun-Ichi Saitoh, Takanori Abe, Tatsuya Ohno, Takashi Nakano
PURPOSE: We designed and evaluated a simple method for predicting the effects of intra-fractional and/or inter-fractional motion on dose distribution during carbon ion radiotherapy (CIRT) for solitary-lesion stage I lung cancer. METHODS: The proposed method uses computed tomography (CT) images from treatment planning and intra-tumoral and/or inter-tumoral displacement. The predicted dose distribution (PDD) was calculated by replacing the current tumor region with the stopping power ratio (SPR) of the lung, and replacing the moved tumor region with the SPR of the tumor...
May 14, 2018: Medical Physics
https://www.readbyqxmd.com/read/29757464/ultrasonography-for-non-invasive-and-real-time-evaluation-of-peri-implant-tissue-dimensions
#7
Hsun-Liang Chan, Khaled Sinjab, Junying Li, Zhaozhao Chen, Hom-Lay Wang, Oliver D Kripfgans
AIM: Existing methods for evaluating marginal bone loss and tissue biotype around dental implants present with many limitations. The aim of this study was to examine the accuracy of high-resolution, 3-dimensional ultrasound to measure peri-implant tissue dimensions. MATERIAL AND METHODS: A 25-MHz ultrasound probe prototype was used to scan peri-implant tissues of 17 implants from 7 fresh human cadavers. Four ultrasonic measurements were made: the marginal bone level/thickness, and mucosal level/thickness...
May 14, 2018: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/29753789/diverse-cavity-types-and-evidence-that-mechanical-action-on-the-necrotic-granuloma-drives-tuberculous-cavitation
#8
Elizabeth A Ihms, Michael E Urbanowski, William R Bishai
Effacement of normal lung parenchyma by cavities is an important sequela of pulmonary tuberculosis. Despite its clinical significance, the pathogenesis of tuberculous cavitation is poorly understood, with controversy as to whether the fundamental mechanism involves matrix depletion, lipid pneumonia, or mechanical factors. In this study, a repetitive aerosol infection model using Mycobacterium tuberculosis was used to generate cavities in 20 New Zealand White rabbits. Serial computed tomography was performed to monitor cavity progression over 14 weeks...
May 10, 2018: American Journal of Pathology
https://www.readbyqxmd.com/read/29747677/use-of-clinical-and-computed-tomography-findings-to-assess-long-term-unsatisfactory-outcome-after-femoral-head-and-neck-ostectomy-in-four-large-breed-dogs
#9
Ciprian Ober, Cosmin Pestean, Lucia Bel, Marian Taulescu, Joshua Milgram, Adrian Todor, Rodica Ungur, Mirela Leșu, Liviu Oana
Femoral head and neck ostectomy (FHNO) is a salvage surgical procedure intended to eliminate hip joint laxity associated pain in the immature dog, or pain due to secondary osteoarthritis in the mature dog. The outcome of the procedure is associated with the size of the dog but the cause of a generally poorer outcome in larger breeds has not been determined. The objective of this study was to assess the long-term results of FHNO associated with unsatisfactory functional outcome by means of clinical examination and computed tomography (CT) scanning...
May 10, 2018: Acta Veterinaria Scandinavica
https://www.readbyqxmd.com/read/29746480/properties-of-traditional-bamboo-carrying-poles-have-implications-for-user-interactions
#10
Ryan T Schroeder, James L Croft, Giang D Ngo, John E A Bertram
Compliant bamboo poles have long been used for load carriage in Asian cultures. Although this custom differs from Western conventions of rigid body attachments (e.g. backpack), potential benefits include reduced peak shoulder forces as well as metabolic transport cost savings. Evidence that carrying a flexible pole benefits locomotion remains mixed, perhaps in part because the properties of pole design (e.g. bamboo material, structural geometry, etc.) have largely been neglected. These properties influence vibrational forces and consequently, the energy required by the user to manage the oscillations...
2018: PloS One
https://www.readbyqxmd.com/read/29732712/dento-alveolar-measurements-and-histomorphometric-parameters-of-maxillary-and-mandibular-first-molars-using-micro-ct
#11
Charlotte E G Theye, André Hattingh, Tamsin J Cracknell, Anna C Oettlé, Maryna Steyn, Stefan Vandeweghe
BACKGROUND: Micro-CT is a high-resolution, non-invasive, and non-destructive imaging technique, currently acknowledged as a gold standard modality for assessing quantitatively and objectively dental morphology and bone microarchitecture parameters. PURPOSE: The aim of this study was to analyze critical dental and periodontal measurements characterizing the mandibular (MandFM) and maxillary (MaxFM) first molar architecture, as well as the corresponding bony socket, using micro-CT...
May 6, 2018: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/29732519/comprehensive-assessment-of-takotsubo-cardiomyopathy-by-cardiac-computed-tomography
#12
Daisuke Sueta, Seitaro Oda, Yasuhiro Izumiya, Koichi Kaikita, Masafumi Kidoh, Daisuke Utsunomiya, Yasuyuki Yamashita, Kenichi Tsujita
Cardiac computed tomography (CT) now plays an important role in emergency settings because of its accessibility and fast acquisition time, which cardiac magnetic resonance imaging (CMR) cannot match. Although cardiac CT was originally conceived for the assessment of the coronary artery tree, it has evolved to embrace several non-coronary applications. These include myocardial assessment, resulting in myocardial characterization comparable with that of CMR and cardiac CT for late enhancement imaging. In this report, we describe a patient with takotsubo cardiomyopathy who underwent a comprehensive assessment using cardiac CT...
May 7, 2018: Emergency Radiology
https://www.readbyqxmd.com/read/29730063/daily-image-guidance-with-cone-beam-computed-tomography-may-reduce-radiation-pneumonitis-in-unresectable-non-small-cell-lung-cancer
#13
Nikhil Yegya-Raman, Sinae Kim, Matthew P Deek, Diana Li, Apar Gupta, Laura Bond, Abhishek Dwivedi, Joel K Braver, Meral Reyhan, Akaash Mittal, Bin Gui, Jyoti Malhotra, Joseph Aisner, Salma K Jabbour
PURPOSE: To investigate the impact of daily image-guided radiation therapy technique on clinical outcomes in patients with inoperable non-small cell lung cancer treated with definitive chemoradiation therapy. METHODS AND MATERIALS: We compared patients with inoperable non-small cell lung cancer receiving daily cone beam computed tomography (CBCT) after an initial 4-dimensional computed tomography (4DCT) simulation (n = 76) with those receiving daily 2-dimensional orthogonal kilovoltage (kV) imaging (n = 48)...
March 30, 2018: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29722297/4d-cone-beam-computed-tomography-cbct-using-a-moving-blocker-for-simultaneous-radiation-dose-reduction-and-scatter-correction
#14
Cong Zhao, Yuncheng Zhong, Xinhui Duan, You Zhang, Xiaokun Huang, Jing Wang, Mingwu Jin
Four-dimensional (4D) X-ray cone-beam computed tomography (CBCT) is important for a precise radiation therapy for lung cancer. Due to the repeated use and 4D acquisition over a course of radiotherapy, the radiation dose becomes a concern. Meanwhile, the scatter contamination in CBCT deteriorates image quality for treatment tasks. In this work, we propose to use a moving blocker (MB) during the 4D CBCT acquisition ("4D MB") and to combine motion-compensated reconstruction to address these two issues simultaneously...
May 3, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29720636/complete-ichthyornis-skull-illuminates-mosaic-assembly-of-the-avian-head
#15
Daniel J Field, Michael Hanson, David Burnham, Laura E Wilson, Kristopher Super, Dana Ehret, Jun A Ebersole, Bhart-Anjan S Bhullar
The skull of living birds is greatly modified from the condition found in their dinosaurian antecedents. Bird skulls have an enlarged, toothless premaxillary beak and an intricate kinetic system that includes a mobile palate and jaw suspensorium. The expanded avian neurocranium protects an enlarged brain and is flanked by reduced jaw adductor muscles. However, the order of appearance of these features and the nature of their earliest manifestations remain unknown. The Late Cretaceous toothed bird Ichthyornis dispar sits in a pivotal phylogenetic position outside living groups: it is close to the extant avian radiation but retains numerous ancestral characters1-3 ...
May 2018: Nature
https://www.readbyqxmd.com/read/29718983/assessment-of-accuracy-and-recognition-of-three-dimensional-computerized-forensic-craniofacial-reconstruction
#16
Geraldo Elias Miranda, Caroline Wilkinson, Mark Roughley, Thiago Leite Beaini, Rodolfo Francisco Haltenhoff Melani
Facial reconstruction is a technique that aims to reproduce the individual facial characteristics based on interpretation of the skull, with the objective of recognition leading to identification. The aim of this paper was to evaluate the accuracy and recognition level of three-dimensional (3D) computerized forensic craniofacial reconstruction (CCFR) performed in a blind test on open-source software using computed tomography (CT) data from live subjects. Four CCFRs were produced by one of the researchers, who was provided with information concerning the age, sex, and ethnic group of each subject...
2018: PloS One
https://www.readbyqxmd.com/read/29683498/advanced-platelet-rich-fibrin-and-freeze-dried-bone-allograft-for-ridge-preservation-a-randomized-controlled-clinical-trial
#17
Daniel Clark, Yogalakshmi Rajendran, Sarmad Paydar, Sunita Ho, Darren Cox, Mark Ryder, John Dollard, Richard T Kao
BACKGROUND: Advanced platelet-rich fibrin (A-PRF) is an autogenous blood product with applications in dento-alveolar surgery. However, there is minimal information regarding its optimal clinical application or efficacy. The aim of this multi-arm parallel randomized controlled clinical trial was to evaluate the efficacy of A-PRF alone or with freeze-dried bone allograft (FDBA) in improving vital bone formation and alveolar dimensional stability during ridge preservation. METHODS: Forty patients requiring extraction of non-molar teeth and replacement with dental implants were randomized into one of four ridge preservation approaches: A-PRF, A-PRF+FDBA, FDBA, or blood clot...
April 2018: Journal of Periodontology
https://www.readbyqxmd.com/read/29682611/unilateral-renal-tumor-cryoablation-and-contralateral-radical-nephrectomy-of-bilateral-renal-tumors-by-transumbilical-3d-multichannel-laparoendoscopic-single-site-surgery
#18
Guopeng Yu, Ke Zhang, Wenzhi Li, Long Li, Yanliang Zhao, Yiwei Wang, Mingxi Xu, Jun Da, Guoqin Dong, Zhong Wang, Bin Xu
Background: Unilateral renal tumor cryoablation and contralateral radical nephrectomy of bilateral renal tumors were performed by transumbilical three-dimensional (3D) multichannel laparoendoscopic single-site (LESS) surgery, in an attempt to verify the feasibility and safety of the procedure, sum up the operational experience, and evaluate the surgical outcome. Case Presentation: This was a 47-year-old female patient with a body mass index of 27.34 kg/m2 without backache, low back pain, hematuria, urinary urgency, frequent urination, dysuria, and other symptoms...
2018: Journal of Endourology Case Reports
https://www.readbyqxmd.com/read/29680509/opioids-delay-healing-of-spinal-fusion-a-rabbit-posterolateral-lumbar-fusion-model
#19
Nikhil Jain, Khaled Himed, Jeffrey M Toth, Karen C Briley, Frank M Phillips, Safdar N Khan
BACKGROUND CONTEXT: Opioid use is prevalent for management of pre- and post-operative pain in patients undergoing spinal fusion. There is evidence that opioids downregulate osteoblasts in-vitro, and one previous study found that morphine delays the maturation and remodeling of callus in a rat femur fracture model. However, the effect of opioids on healing of spinal fusion has not been investigated before. Isolating the effect of opioid exposure in humans would be limited by the numerous confounding factors that affect fusion healing...
April 19, 2018: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29677217/optimisation-of-three-dimensional-lower-jaw-resection-margin-planning-using-a-novel-black-bone-magnetic-resonance-imaging-protocol
#20
Astrid M Hoving, Joep Kraeima, Rutger H Schepers, Hildebrand Dijkstra, Jan Hendrik Potze, Bart Dorgelo, Max J H Witjes
BACKGROUND: MRI is the optimal method for sensitive detection of tumour tissue and pre-operative staging in oral cancer. When jawbone resections are necessary, the current standard of care for oral tumour surgery in our hospital is 3D virtual planning from CT data. 3D printed jawbone cutting guides are designed from the CT data. The tumour margins are difficult to visualise on CT, whereas they are clearly visible on MRI scans. The aim of this study was to change the conventional CT-based workflow by developing a method for 3D MRI-based lower jaw models...
2018: PloS One
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