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https://www.readbyqxmd.com/read/28291909/the-effects-of-metal-artifact-reduction-on-the-retrieval-of%C3%A2-attenuation-values
#1
Christian Ziemann, Maik Stille, Florian Cremers, Dirk Rades, Thorsten M Buzug
BACKGROUND: The quality of CT slices can be drastically reduced in the presence of high-density objects such as metal implants within the patients' body due to the occurrence of streaking artifacts. Consequently, a delineation of anatomical structures might not be possible, which strongly influences clinical examination. PURPOSE: The aim of the study is to clinically evaluate the retrieval of attenuation values and structures by the recently proposed Augmented Likelihood Image Reconstruction (ALIR) and linear interpolation in the presence of metal artifacts...
January 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28256437/the-main-cause-of-instability-after-unconstrained-shoulder-prosthesis-is-soft-tissue-deficiency
#2
Jean Kany, Jijo Jose, Denis Katz, Jean David Werthel, Padmanaban Sekaran, Rajkumar S Amaravathi, Philippe Valenti
BACKGROUND: Instability is one of the major causes of failures in unconstrained anatomic total shoulder arthroplasty (TSA). This study reviewed the instabilities that may occur in an anatomic shoulder platform system to identify its potential predictors. We hypothesized that soft tissue deficiency was the main cause of instability and that the best treatment option would be conversion to a reverse shoulder arthroplasty (RSA). MATERIALS AND METHODS: Between 2003 and 2013, we reviewed 27 patients who experienced postoperative instability, and the overall incidence was 5...
February 27, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28065638/iterative-metal-artefact-reduction-in-ct-can-dedicated-algorithms-improve-image-quality-after%C3%A2-spinal-instrumentation
#3
J Aissa, C Thomas, L M Sawicki, J Caspers, P Kröpil, G Antoch, J Boos
AIM: To investigate the value of dedicated computed tomography (CT) iterative metal artefact reduction (iMAR) algorithms in patients after spinal instrumentation. MATERIALS AND METHODS: Post-surgical spinal CT images of 24 patients performed between March 2015 and July 2016 were retrospectively included. Images were reconstructed with standard weighted filtered back projection (WFBP) and with two dedicated iMAR algorithms (iMAR-Algo1, adjusted to spinal instrumentations and iMAR-Algo2, adjusted to large metallic hip implants) using a medium smooth kernel (B30f) and a sharp kernel (B70f)...
May 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28047585/su-d-206-06-task-specific-optimization-of-scintillator-thickness-for-cmos-detector-based-cone-beam-breast-ct
#4
S Vedantham, S Shrestha, L Shi, G Vijayaraghavan, A Karellas
PURPOSE: To optimize the cesium iodide (CsI:Tl) scintillator thickness in a complimentary metal-oxide semiconductor (CMOS)-based detector for use in dedicated cone-beam breast CT. METHODS: The imaging task considered was the detection of a microcalcification cluster comprising six 220µm diameter calcium carbonate spheres, arranged in the form of a regular pentagon with 2 mm spacing on its sides and a central calcification, similar to that in ACR-recommended mammography accreditation phantom, at a mean glandular dose of 4...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27884628/skirt-followed-by-trouser-stenting-technique-true-anatomical-preservation-of-coronary-y-shaped-bifurcation-lesions-while-using-vanishing-bioresorbable-scaffolds-a-report-of-two-cases
#5
Wael Elabbassi, Arif Al Nooryani
We report on two cases in which Y-shaped coronary bifurcations were treated with the use of Bioresorbable scaffolds. The first case was of a 50-year-old man with NSTEMI. Coronary angiography showed stenosis involving a Y-shaped bifurcation of proximal to mid LAD and diagonal. The lesion was wired using two 0.14 BMW guide wires, followed by serial pre-dilatation of LAD and Diagonal branch. The stent into proximal LAD was deployed first as a skirt (3.5 × 12 BVS). Stent was post-dilated. A second 2.5 × 28 BVS was deployed into diagonal branch, protruding backwards; along with a 2...
June 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/27711137/comparison-study-between-conventional-sequence-and-slice-encoding-metal-artifact-correction-semac-in-the-diagnosis-of-postoperative-complications-in-patients-receiving-lumbar-inter-body-fusion-and-pedicle-screw-fixation-surgery
#6
Sol Bee Han, Young Cheol Yoon, Jong Won Kwon
BACKGROUND AND PURPOSE: Slice-Encoding Metal Artifact Correction (SEMAC) sequence is one of the metal artifact reduction techniques of anatomical structure, but there has been no report about evaluation of post-operative complications. The purpose of this article is to compare the anatomical visibility between fast spin echo (FSE) and FSE-SEMAC and to evaluate the additional value of FSE-SEMAC in diagnostic confidence of the complications. MATERIALS AND METHODS: We conducted a retrospective study with 54 patients who received lumbar spinal surgery and MR images including FSE-SEMAC...
2016: PloS One
https://www.readbyqxmd.com/read/27309775/metal-artifact-reduction-in-computed-tomography-after-deep-brain-stimulation-electrode-placement-using-iterative-reconstructions
#7
Joel Aissa, Johannes Boos, Christoph Schleich, Martin Sedlmair, Karl Krzymyk, Patric Kröpil, Gerald Antoch, Christoph Thomas
OBJECTIVES: Diagnostic accuracy of intraoperative computed tomography (CT) after deep brain stimulation (DBS) electrode placement is limited due to artifacts induced by the metallic hardware, which can potentially mask intracranial postoperative complications. Different metal artifact reduction (MAR) techniques have been introduced to reduce artifacts from metal hardware in CT. The purpose of this study was to assess the impact of a novel iterative MAR technique on image quality and diagnostic performance in the follow-up of patients with DBS electrode implementation surgery...
January 2017: Investigative Radiology
https://www.readbyqxmd.com/read/27163590/whole-body-clinical-applications-of-digital-tomosynthesis
#8
REVIEW
Haruhiko Machida, Toshiyuki Yuhara, Mieko Tamura, Takuya Ishikawa, Etsuko Tate, Eiko Ueno, Katelyn Nye, John M Sabol
With flat-panel detector mammography, radiography, and fluoroscopy systems, digital tomosynthesis (DT) has been recently introduced as an advanced clinical application that removes overlying structures, enhances local tissue separation, and provides depth information about structures of interest by providing high-quality tomographic images. DT images are generated from projection image data, typically using filtered back-projection or iterative reconstruction. These low-dose x-ray projection images are easily and swiftly acquired over a range of angles during a single linear or arc sweep of the x-ray tube assembly...
May 2016: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/26791172/platform-systems-in-shoulder-arthroplasty
#9
Brian C Werner, Joshua S Dines, David M Dines
A platform system for shoulder arthroplasty can include a convertible modular humeral stem and/or a metal-backed glenoid component to facilitate straightforward conversion from either a hemiarthroplasty or anatomic total shoulder arthroplasty to a subsequent anatomic total shoulder arthroplasty, or more frequently, reverse total shoulder arthroplasty without any revision to the stem and/or glenoid baseplate. Recent studies have demonstrated a decreased rate of intraoperative humeral fracture, complications, and blood loss when a platform system is used and the humeral stem is not exchanged during revision arthroplasty...
March 2016: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/26372761/midterm-follow-up-of-metal-backed-glenoid-components-in-anatomical-total-shoulder-arthroplasties
#10
Thomas Obermeyer, Paul J Cagle, Bradford O Parsons, Evan L Flatow
Loosening of the glenoid remains one of the most common complications of total shoulder arthroplasty (TSA) and is the most cited reason for performing revision arthroplasty. Ingrowth metal-backed glenoid components offer the theoretical advantage of bone growth directly into the prosthesis with a single host-prosthesis interface. In the study reported here, we retrospectively reviewed the charts of patients who had TSAs performed by 2 fellowship-trained shoulder surgeons using glenoid components with porous tantalum anchors...
September 2015: American Journal of Orthopedics
https://www.readbyqxmd.com/read/26251433/ct-metal-artifact-reduction-in-the-spine-can-an-iterative-reconstruction-technique-improve-visualization
#11
A L Kotsenas, G J Michalak, D R DeLone, F E Diehn, K Grant, A F Halaweish, A Krauss, R Raupach, B Schmidt, C H McCollough, J G Fletcher
BACKGROUND AND PURPOSE: Metal-related artifacts from spine instrumentation can obscure relevant anatomy and pathology. We evaluated the ability of CT images reconstructed with and without iterative metal artifact reduction to visualize critical anatomic structures in postoperative spines and assessed the potential for implementation into clinical practice. MATERIALS AND METHODS: We archived CT projection data in patients with instrumented spinal fusion. CT images were reconstructed by using weighted filtered back-projection and iterative metal artifact reduction...
November 2015: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/26227769/metal-backed-glenoid-implant-with-polyethylene-insert-is-not-a-viable-long-term-therapeutic-option
#12
Pascal Boileau, Grégory Moineau, Nicolas Morin-Salvo, Cyrille Avidor, Arnaud Godenèche, Christophe Lévigne, Mohamed Baba, Gilles Walch
BACKGROUND: The aims of this study were to determine the survival of anatomic total shoulder arthroplasty with uncemented metal-backed (MB) glenoid components with a polyethylene (PE) insert in primary osteoarthritis, to assess the reasons for revision surgery, and to identify patients and diagnostic factors that influence failure rates. METHODS: Between 1994 and 1999, 165 patients (mean age, 68 years) with primary osteoarthritis were treated with anatomic total shoulder arthroplasty using an uncemented MB/PE glenoid component...
October 2015: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/25829449/the-glenoid-component-in-anatomic-shoulder-arthroplasty
#13
REVIEW
Daphne Pinkas, Brett Wiater, J Michael Wiater
Ideal management of the glenoid in anatomic shoulder arthroplasty remains controversial. Glenoid component loosening remains a common source of clinical concern and, in young, active patients, implantation of a glenoid prosthesis is often avoided. Efforts to decrease glenoid loosening have resulted in changes to prosthetic design and implantation techniques. Currently, a wide variety of glenoid component options are available, including metal-backed or all-polyethylene, bone ingrowth or ongrowth, inset, and augmented designs...
May 2015: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/24682713/bone-remodelling-of-the-scapula-after-a-total-shoulder-arthroplasty
#14
C Quental, P R Fernandes, J Monteiro, J Folgado
According to Wolff's law, the changes in stress after a prosthesis implantation may modify the shape and internal structure of bone, thus compromising the long-term prosthesis fixation and, consequently, be a significant factor for glenoid loosening. The aim of the present study is to evaluate the changes in the bone adaptation process of the scapula after an anatomical and reverse total shoulder arthroplasty. Five finite element models of the implanted scapula are developed considering the implantation of three anatomical, cemented, all-polyethylene components; an anatomical, cementless, metal-backed component; and a reverse, all-metal component...
August 2014: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/24682516/surgeon-s-experience-influences-uka-survivorship-a-comparative-study-between-all-poly-and-metal-back-designs
#15
COMPARATIVE STUDY
F Zambianchi, V Digennaro, A Giorgini, G Grandi, F Fiacchi, R Mugnai, F Catani
PURPOSE: Concerns exist regarding prosthetic positioning and post-operative limb alignment in unicompartmental knee arthroplasty (UKA). In this study, we hypothesized deviations of the post-op anatomical femoro-tibial angle (aFTA) and the tibial component alignment to be factors influencing UKA survivorship. Moreover, by a comparison between all-poly and metal back UKAs, we hypothesized that prosthetic design plays a role in implant survivorship. METHODS: One hundred ninety-five medial UKAs were performed on 176 patients by two experienced surgeons and one low-UKA user...
July 2015: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/24332950/nonstandard-glenoid-components-for-bone-deficiencies-in-shoulder-arthroplasty
#16
Akin Cil, John W Sperling, Robert H Cofield
BACKGROUND: Glenoid bone deficiencies may be addressed by specialized components. The purpose of this study is to evaluate the clinical and radiographic outcomes of 3 different types of nonstandard glenoid components. MATERIALS AND METHODS: Thirty-eight patients with a mean age of 65 years (range, 34-84 years) underwent a primary or revision anatomic shoulder arthroplasty with one of 3 nonstandard glenoid components: a polyethylene component with an angled keel for posterior glenoid wear without posterior subluxation; a polyethylene component with 2 mm of extra thickness for central glenoid erosion; or a posteriorly augmented metal-backed glenoid component for posterior glenoid wear and posterior subluxation...
July 2014: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/24328579/use-of-a-caged-bone-ingrowth-glenoid-implant-in-anatomic-total-shoulder-arthroplasty-technique-and-early-results
#17
Sean G Grey
Shoulder arthroplasty represents one of the fastest growing orthopaedic procedures in the USA. In comparison to hemiarthroplasty, total shoulder arthroplasty has higher patient satisfaction and lower revision rates. Aseptic glenoid loosening remains a concern for longevity of total shoulder arthroplasties. Cement fixation on the glenoid side represents the primary and only mode of fixation in the majority of implants in the USA. Metal backed glenoid designs have demonstrated higher failure rates, primarily due to thinning of the polyethylene bearing surface...
2013: Bulletin of the Hospital for Joint Diseases
https://www.readbyqxmd.com/read/23911250/clinical-consequence-of-bare-metal-stent-and-stent-graft-failure-in-femoropopliteal-occlusive-disease
#18
COMPARATIVE STUDY
Shant M Vartanian, Paul C Johnston, Joy P Walker, Sara J Runge, Charles M Eichler, Linda M Reilly, Jade S Hiramoto, Michael S Conte
OBJECTIVE: The optimal role for bare metal stents (BMS) or stent grafts (SG) in femoropopliteal occlusive disease (FPOD) is as of yet undefined. Understanding the clinical consequences of failure can help guide initial treatment decisions. The goal of this study was to define the nature, frequency, and risk factors for adverse clinical events related to BMS and SG failure in FPOD. METHODS: This is a single-institution retrospective review of primary endovascular interventions for FPOD using either a BMS or SG, from September 2007 through October 2011...
December 2013: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/23762618/imaging-of-electrode-position-after-cochlear-implantation-with-flat-panel-ct
#19
Diana Arweiler-Harbeck, Christoph Mönninghoff, Jens Greve, Thomas Hoffmann, Sophia Göricke, Judith Arnolds, Nina Theysohn, Ulrich Gollner, Stephan Lang, Michael Forsting, Marc Schlamann
Background. Postoperative imaging after cochlear implantation is usually performed by conventional cochlear view (X-ray) or by multislice computed tomography (MSCT). MSCT after cochlear implantation often provides multiple metal artefacts; thus, a more detailed view of the implant considering the given anatomy is desirable. A quite new method is flat panel volume computed tomography. The aim of the study was to evaluate the method's clinical use. Material and Methods. After cochlear implantation with different implant types, flat panel CT scan (Philips Allura) was performed in 31 adult patients...
2012: ISRN Otolaryngology
https://www.readbyqxmd.com/read/23685831/conversion-of-shoulder-arthroplasty-to-reverse-implants-clinical-and-radiological-results-using-a-modular-system
#20
MULTICENTER STUDY
Alessandro Castagna, Marco Delcogliano, Francesca de Caro, Giovanni Ziveri, Mario Borroni, Stefano Gumina, Franco Postacchini, Carlo Felice De Biase
PURPOSE: Revision of a shoulder arthroplasty to a reverse arthroplasty is a highly demanding procedure. The aim of this study is to report the clinical results of hemi and total shoulder prosthesis revisions to reverse implants without removal of the humeral stem, using a modular shoulder replacement system (SMR Lima LTD). We retrospectively reviewed 26 patients who underwent an operation from 2004 to 2009. METHODS: The patients were divided into two groups: in Group I, 18 patients underwent a revision of hemiarthroplasty implanted for fracture; in Group II, eight patients underwent a revision of anatomical total prosthesis...
July 2013: International Orthopaedics
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