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Computed tomography

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https://www.readbyqxmd.com/read/28231643/three-dimensional-reconstruction-computed-tomography-evaluation-of-the-tunnel-location-and-angle-in-anatomic-single-bundle-anterior-cruciate-ligament-reconstruction-a-comparison-of-the-anteromedial-portal-and-outside-in-techniques
#1
Kang-Il Kim, Sang Hak Lee, Chanil Bae, Sung Hae Bae
Purpose: The purpose of this study was to compare the geometry and position of the femoral tunnel between the anteromedial portal (AMP) and outside-in (OI) techniques after anatomic single-bundle anterior cruciate ligament (ACL) reconstruction. Materials and Methods: We evaluated 82 patients undergoing single-bundle ACL reconstruction with hamstring autografts using either the AMP (n=40) or OI (n=42) technique. The locations of the tunnel apertures were assessed by postoperative 3-dimensional computed tomography imaging...
March 1, 2017: Knee Surgery & related Research
https://www.readbyqxmd.com/read/28231555/edge-preserving-denoising-for-intra-operative-cone-beam-ct-in-endovascular-aneurysm-repair
#2
Yi Liu, Miguel Castro, Mathieu Lederlin, Huazhong Shu, Adrien Kaladji, Pascal Haigron
C-arm cone-beam computed tomography (CBCT) acquisition during endovascular aneurysm repair (EVAR) is an emergent technology with more and more applications. It offers real time imaging with a stationary patient and provides 3-D information to achieve guidance of intervention. However, there is growing concern on the overall radiation doses delivered to patients all along the endovascular management due to pre-, intra-, and post-operative X-ray imaging. Manufactures may have their low dose protocols to realize reduction of radiation dose, but CBCT with a low dose protocol has too many artifacts, particularly streak artifacts, and decreased contrast-to-noise ratio (CNR)...
January 30, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28231405/three-dimensional-printing-of-x-ray-computed-tomography-datasets-with-multiple-materials-using-open-source-data-processing
#3
Ian M Sander, Matthew T McGoldrick, My N Helms, Aislinn Betts, Anthony van Avermaete, Elizabeth Owers, Evan Doney, Taimi Liepert, Glen Niebur, Douglas Liepert, W Matthew Leevy
Advances in three-dimensional (3D) printing allow for digital files to be turned into a "printed" physical product. For example, complex anatomical models derived from clinical or pre-clinical X-ray computed tomography (CT) data of patients or research specimens can be constructed using various printable materials. Although 3D printing has the potential to advance learning, many academic programs have been slow to adopt its use in the classroom despite increased availability of the equipment and digital databases already established for educational use...
February 23, 2017: Anatomical Sciences Education
https://www.readbyqxmd.com/read/28231370/significance-of-imaging-in-the-diagnosis-of-olfactory-disorder
#4
Teemu Harju, Markus Rautiainen, Ilkka Kivekäs
The aim of this retrospective analysis was to examine olfactory disorders among the patients in the Ear, Nose, and Throat Clinic of Tampere University Hospital, Finland, from 2001 to 2011, and to evaluate the necessity of imaging in the examination of patients with olfactory disorders. Charts of 143 consecutive patients with a primary olfactory disorder were examined, and 69 patients who had undergone the necessary testing were included in the study. The most common causes of olfactory disorder were upper respiratory infection (23%), chronic rhinosinusitis (19%), head trauma (17%), and allergic or nonallergic rhinitis (6%)...
February 2017: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/28231348/association-between-bone-graft-volume-and-maxillary-sinus-membrane-elevation-height
#5
Tetsuya Sonoda, Takehiro Harada, Nobuyuki Yamamichi, Alberto Monje, Hom-Lay Wang
PURPOSE: Maxillary sinus augmentation via crestal approach has been advocated as an alternative approach for sinus membrane elevation. Presently, no study has examined the relationship between the amount of bone grafting material placed and the final sinus membrane elevation height. Therefore, the present study was aimed at investigating the extent of sinus membrane elevation height depending on the amount of bone grafting material inserted as well as three-dimensionally assessing the likelihood of membrane perforation during membrane elevation...
February 23, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28231322/clinical-evaluation-of-new-automatic-coronary-specific-best-cardiac-phase-selection-algorithm-for-single-beat-coronary-ct-angiography
#6
Hui Wang, Lei Xu, Zhanming Fan, Junfu Liang, Zixu Yan, Zhonghua Sun
The aim of this study was to evaluate the workflow efficiency of a new automatic coronary-specific reconstruction technique (Smart Phase, GE Healthcare-SP) for selection of the best cardiac phase with least coronary motion when compared with expert manual selection (MS) of best phase in patients with high heart rate. A total of 46 patients with heart rates above 75 bpm who underwent single beat coronary computed tomography angiography (CCTA) were enrolled in this study. CCTA of all subjects were performed on a 256-detector row CT scanner (Revolution CT, GE Healthcare, Waukesha, Wisconsin, US)...
2017: PloS One
https://www.readbyqxmd.com/read/28231320/improved-image-quality-and-diagnostic-potential-using-ultra-high-resolution-computed-tomography-of-the-lung-with-small-scan-fov-a-prospective-study
#7
Huiyuan Zhu, Lian Zhang, Yali Wang, Preeti Hamal, Xiaofang You, Haixia Mao, Fei Li, Xiwen Sun
The aim of this study was to assess whether CT imaging using an ultra-high-resolution CT (UHRCT) scan with a small scan field of view (FOV) provides higher image quality and helps to reduce the follow-up period compared with a conventional high-resolution CT (CHRCT) scan. We identified patients with at least one pulmonary nodule at our hospital from July 2015 to November 2015. CHRCT and UHRCT scans were conducted in all enrolled patients. Three experienced radiologists evaluated the image quality using a 5-point score and made diagnoses...
2017: PloS One
https://www.readbyqxmd.com/read/28230915/a-singlet-oxygen-generating-agent-by-chirality-dependent-plasmonic-shell-satellite-nanoassembly
#8
Fengli Gao, Maozhong Sun, Wei Ma, Xiaoling Wu, Liqiang Liu, Hua Kuang, Chuanlai Xu
Photodynamic therapy (PDT) agent, which generates singlet oxygen ((1) O2 ) under light, has attracted significant attention for its broad biological and medical applications. Here, DNA-driven shell-satellite (SS) gold assemblies as chiral photosensitizers are first fabricated. The chiral plasmonic nanostructure, coupling with cysteine enantiomers on its surface, exhibits intense chiroplasmonic activities (-40.2 ± 2.6 mdeg) in the visible region. These chiral SS nanoassemblies have high reactive oxygen species generating efficiency under circular polarized light illumination, resulting in a (1) O2 quantum yield of 1...
February 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28230623/safety-and-accuracy-of-freehand-versus-navigated-iliac-screws-results-from-222-screw-placements
#9
Randall J Hlubek, Kaith K Almefty, David S Xu, Jay D Turner, U Kumar Kakarla
STUDY DESIGN: Retrospective review. OBJECTIVE: To compare the safety and accuracy of the freehand technique versus stereotactic navigation for placement of iliac screws. SUMMARY OF BACKGROUND DATA: Iliac screw fixation is often used to augment lumbosacral reconstruction in advanced spine disease to increase the likelihood of successful arthrodesis. Iliac screws can be placed with image guidance, using either intraoperative fluoroscopy or computed tomography (CT) to guide navigation...
February 22, 2017: Spine
https://www.readbyqxmd.com/read/28230613/osteoid-osteoma-of-the-acetabulum-diagnosis-and-medical-treatment
#10
Nikolaos A Laliotis, Antonia S Bindoudi, Ioannis A Tsitouridis, Iordanis G Petrakis, John M Kirkos
We describe the medical management of an acetabular osteoid osteoma in an 11-year-old girl. There was a 2-year delay until proper diagnosis of the patient's pathology was made. Accurate localization of the nidus in the subchondral bone, involving the cartilage, is difficult on the basis of plain radiographs. All imaging methods, including computed tomography, MRI, and bone scintigraphy, were used to confirm the diagnosis. We proposed medical treatment to avoid possible severe complications from surgical intervention...
February 22, 2017: Journal of Pediatric Orthopedics. Part B
https://www.readbyqxmd.com/read/28230608/specialized-imaging-and-procedures-in-pediatric-pancreatology-a-north-american-society-for-pediatric-gastroenterology-hepatology-and-nutrition-clinical-report
#11
Tom K Lin, David M Troendle, Daniel B Wallihan, Bradley Barth, Victor L Fox, Douglas S Fishman, Veronique D Morinville
OBJECTIVES: An increasing number of children are being diagnosed with pancreatitis and other pancreatic abnormalities. Dissemination of the information regarding existing imaging techniques and endoscopic modalities to diagnose and manage pancreatic disorders in children is sorely needed. METHODS: We conducted a review of the medical literature on the use of the following imaging and procedural modalities in pediatric pancreatology: transabdominal ultrasonography (TUS), computed tomography (CT), magnetic resonance imaging (MRI)/magnetic resonance cholangiopancreatography (MRCP), endoscopic ultrasonography (EUS), and endoscopic retrograde cholangiopancreatography (ERCP)...
March 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28230603/computed-tomography-evaluation-of-nasal-bone-and-nasal-pyramid-in-the-turkish-population
#12
Hatice Kaplanoglu, Hüseyin Coskun, Ugur Toprak
OBJECTIVE: To classify shapes of the nasal bones in the Turkish population and comparatively evaluate the sizes of nasal bone and piriform apertures. METHODS: Two- and three-dimensional paranasal sinus computed tomography images of 363 patients were evaluated. Upper, intermediate, and inferior thickness of bilateral nasal bones and thickness of medial and lateral osteotomy line were measured. The shapes of the nasal bones were classified. RESULTS: The mean thickness of nasal bone in the study participants was 1...
February 22, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28230597/histomorphometric-evaluation-of-two-different-bone-substitutes-in-sinus-floor-augmentation-procedures
#13
Marco Portelli, Marco Cicciù, Floriana Lauritano, Gabriele Cervino, Maurizio Manuelli, Enrico Felice Gherlone, Alessandra Lucchese
The aim of this study is to compare the histomorphometric data of deproteinized bovine bone (DBB) and a fully synthetic bone substitute, poly (lactic-co-glycolic) acid/hydroxyapatite (PLGA/HA) applied for sinus floor augmentation technique. Twelve maxillary atrophic ridges of 8 patients requiring major maxillary sinus floor augmentation were studied; the sites were randomly assigned to the study groups and reexamined at 6 months after grafting using cone beam computed tomography scans and biopsy samples harvested during dental implant placement...
February 22, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28230568/obesity-hepatic-steatosis-and-their-impact-on-fat-infiltration-of-the-trunk-musculature-using-unenhanced-computed-tomography
#14
Ronnie Sebro
OBJECTIVES: The aim of the study was to assess whether hepatic steatosis predicts muscle fat content independent of body mass index (BMI). METHODS: Regions of interest were drawn over several trunk muscles and over the right lobe of the liver to obtain the computed tomography (CT) density in 100 subjects with unenhanced CT studies of the abdomen and pelvis. Univariate and multivariate linear regression were used to examine the associations between BMI and hepatic steatosis and between BMI and trunk muscle density...
February 23, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28230539/polyenergetic-known-component-ct-reconstruction-with-unknown-material-compositions-and-unknown-x-ray-spectra
#15
Shiyu Xu, Ali Uneri, Akhil Khanna, Jeffrey Siewerdsen, Joseph Webster Stayman
Metal artifacts can cause substantial image quality issues in computed tomography. This is particularly true in interventional imaging where surgical tools or metal implants are in the field-of-view. Moreover, the region-of-interest is often near such devices which is exactly where image quality degradations are largest. Previous work on known-component reconstruction (KCR) has shown the incorporation of a physical model (e.g. shape, material composition, etc.) of the metal component into the reconstruction algorithm can significantly reduce artifacts even near the edge of a metal component...
February 23, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28230234/nasal-infestation-by-linguatula-serrata-in-a-dog-in-the-uk-a-case-report
#16
E Villedieu, R F Sanchez, R E Jepson, G Ter Haar
A two-year-old, female neutered, cross-breed dog imported from Romania was diagnosed with nasal infestation of Linguatula serrata after she sneezed out an adult female. The dog was presented with mucopurulent/sanguinous nasal discharge, marked left-sided exophthalmia, conjunctival hyperaemia and chemosis. Computed tomography and left frontal sinusotomy revealed no further evidence of adult parasites. In addition, there was no evidence of egg shedding in the nasal secretions or faeces. Clinical signs resolved within 48 hours of sinusotomy, and with systemic broad-spectrum antibiotics and non-steroidal anti-inflammatory drugs...
February 23, 2017: Journal of Small Animal Practice
https://www.readbyqxmd.com/read/28230059/synergistic-effects-of-dimethyloxallyl-glycine-and-recombinant-human-bone-morphogenetic-protein-2-on-repair-of-critical-sized-bone-defects-in-rats
#17
Xin Qi, Yang Liu, Zhen-Yu Ding, Jia-Qing Cao, Jing-Huan Huang, Jie-Yuan Zhang, Wei-Tao Jia, Jing Wang, Chang-Sheng Liu, Xiao-Lin Li
In bone remodeling, osteogenesis is closely coupled to angiogenesis. Bone tissue engineering using multifunctional bioactive materials is a promising technique which has the ability to simultaneously stimulate osteogenesis and angiogenesis for repair of bone defects. We developed mesoporous bioactive glass (MBG)-doped poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) composite scaffolds as delivery vehicle. Two bioactive molecules, dimethyloxalylglycine (DMOG), a small-molecule angiogenic drug, and recombinant human bone morphogenetic protein-2 (rhBMP-2), an osteoinductive growth factor, were co-incorporated into the scaffold...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28230044/a-meta-analysis-to-evaluate-the-diagnostic-value-of-dual-time-point-f-fluorodeoxyglucose-positron-emission-tomography-computed-tomography-for-diagnosis-of-pulmonary-nodules
#18
Ming Zhao, Yongfu Ma, Bo Yang, Yuqi Wang
OBJECTIVES: This meta-analysis aimed at evaluating the efficacy of dual-time-point (DTP) F-fluorodeoxyglucose (F-FDG) positron emission tomography/computed tomography (PET/CT) in diagnosing pulmonary nodules. METHODS: Using computer and manual search, the current research about the efficacy of DTP F-FDG PET/CT in diagnosing pulmonary nodules was collected. According to the evaluation criteria of Quality Assessment of Diagnostic Accuracy Studies Scale, the data from 13 studies were analyzed by Meta-DiSc software, and the sensitivity (Sen), specificity (Spe), diagnostic odds ratios (DOR), positive likelihood ratios (LR+), and negative likelihood ratios (LR-) were summarized...
December 2016: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28230026/the-diagnostic-value-of-contrast-enhanced-computed-tomography-imaging-for-detection-of-colorectal-tumors-a-meta-analysis
#19
Qing Yu, Jie Liu
OBJECTIVE: To evaluate the application usage of contrast-enhanced computer tomography imaging for colorectal tumors diagnosis. METHODS: By searching the Medline and CNKI databases, we collected all diagnostic tests about contrast-enhanced CT imaging for colorectal tumors. Sensitivity and specificity were calculated to evaluate the usage of individual diagnostic tests. The data were analyzed using statistic software Meta-DiSc 1.4. RESULTS: Nine trials that included a total of 4797 patients were analyzed in this study...
December 2016: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28230013/iodine-125-radioactive-seed-tissue-implantation-as-a-remedy-treatment-for-recurrent-cervical-cancer
#20
Lei Han, Changlun Li, Junye Wang, Xueqi He, Xiao Zhang, Jundong Yang, Guofeng Liu
PURPOSE: This study was designed to discuss feasibility, short-term efficacy, and complications of iodine-125 radioactive seed tissue implantation for remedying recurrent cervical cancer. MATERIALS AND METHODS: From June 2009 to December 2010, 17 patients with recurrent cervical cancer received radioactive seed implantation under computed tomography (CT) guidance. Matched peripheral dose was 145 Gy, while the number of implanted seeds was from 6 to 68 with a median of 20...
December 2016: Journal of Cancer Research and Therapeutics
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