Read by QxMD icon Read


Kerstin Mueller, Rebecca Fahrig, Michael Manhart, Yu Deuerling-Zheng, Jarrett Rosenberg, Teri Moore, Arundhuti Ganguly, Nishita Kothary
RATIONALE AND OBJECTIVES: Intra-procedural measurement of hepatic perfusion following liver embolization continues to be a challenge. Blood volume imaging before and after interventional procedures would allow identifying the treatment end point or even allow predicting treatment outcome. Recent liver oncology studies showed the feasibility of parenchymal blood volume (PBV) imaging using an angiographic C-arm system. This study was done to evaluate the reproducibility of PBV measurements using cone beam computed tomography (CBCT) before and after embolization of the liver in a swine model...
October 10, 2016: Academic Radiology
Anton P Lambers, Robert Jennings, Andrew T Bucknill
INTRODUCTION: Accurate prosthetic cup placement is important in total hip arthroplasty (THA) and can be influenced by patient positioning. This study aims to assess the accuracy of patient positioning prior to THA, describe a new technique of assessment, and evaluate the influence of body mass index (BMI) on positioning error. METHODS: A consecutive series of 37 patients undergoing unilateral THA were investigated. After patient positioning in lateral decubitus, a lateral fluoroscopic image through the table was taken...
October 8, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
Baoqing Pei, Gang Zhu, Yu Wang, Huiting Qiao, Xiangqian Chen, Binbin Wang, Xiaoyun Li, Weijun Zhang, Wenyong Liu, Yubo Fan
BACKGROUND: Spatial positioning is the key function of a surgical navigation robot system, and accuracy is the most important performance index of such a system. METHODS: The kinematic parameters of a six degrees of freedom (DOF) robot arm were used to form the transformation from intraoperative fluoroscopy images to a robot's coordinate system without C-arm calibration and to solve the redundant DOF problem. The influences of three typical error sources and their combination on the final navigation error were investigated through Monte Carlo simulation...
October 9, 2016: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
Nicholas Quercetti, Brandon Horne, Zac DiPaolo, Michael J Prayson
BACKGROUND: Traditionally, operative fixation of pelvic and acetabular injuries involves complex approaches and significant complications. Accelerated rehabilitation, decreased soft tissue stripping and decreased wound complications are several benefits driving a recent interest in percutaneous fixation. We describe a new fluoroscopic view to guide the placement of screws within the anterior pelvic ring. METHODS: Twenty retrograde anterior pelvic ring screws were percutaneously placed in ten cadaveric specimens...
October 7, 2016: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
Dan Xia, David A Langan, Stephen B Solomon, Zheng Zhang, Buxin Chen, Hao Lai, Emil Y Sidky, Xiaochuan Pan
We investigate an optimization-based reconstruction, with an emphasis on image-artifact reduction, from data collected in C-arm cone-beam computed tomography (CBCT) employed in image-guided interventional procedures. In the study, an image to be reconstructed is formulated as a solution to a convex optimization program in which a weighted data divergence is minimized subject to a constraint on the image total variation (TV); a data-derivative fidelity is introduced in the program specifically for effectively suppressing dominant, low-frequency data artifact caused by, e...
October 21, 2016: Physics in Medicine and Biology
Ruiqi Li, Xiaoxia Hu, Libing Wang, Hui Cheng, Shuqing Lv, Weiping Zhang, Jianmin Wang, Jianmin Yang, Xianmin Song
Acute myeloid leukemia (AML) patients with t(8;21) aberration often have favorable outcomes, however, relapse still occurs in 30%-40% patients, with only 50%-60% of patients with t(8;21) AML cured with regimens containing high-dose cytarabine (HD-Ara-C). To evaluate the effects of fludarabine and cytarabine (FA) consolidation therapy for t(8;21) AML patients, a prospective randomized study was performed. A total of 45 patients with t(8;21) AML after achieving complete remission (CR) were randomly assigned to receive four course consolidation with FA (n=23) or HD-Ara-C (n=22)...
September 27, 2016: American Journal of Hematology
David J Wrigglesworth, Michael Q Bailey, Alison Colyer, Kevin R Hughes
A limiting factor of radiographic contrast studies is the requirement for restraint of the animal in order to reduce movement artifacts. To demonstrate that gastrointestinal transit can be analyzed by a barium meal in nonsedated and unrestrained dogs, a pilot study of six adult Labrador retriever dogs was undertaken. Study subjects were selected by convenience sampling from an available population of Labrador dogs and were trained to stand motionless during radiographic fluoroscopy. Following a meal containing 7% w/w powdered barium sulfate, radiographic images were generated using a digital fluoroscope C-arm, at intervals of 5, 15, and 30 min, and at 1, 2, 3, 4, 5, 6, 7, and 8 h...
September 19, 2016: Veterinary Radiology & Ultrasound
Robert M Sweet
BACKGROUND: The challenges of training and assessing endourologic skill have driven the development of new training systems. The Center for Research in Education and Simulation Technologies (CREST) has developed a team and a methodology to facilitate this development process. METHODS: Backwards design principles were applied. A panel of experts first defined desired clinical and educational outcomes. Outcomes were subsequently linked to learning objectives. Gross task deconstruction was performed and the primary domain was classified as primarily involving decision-making, psychomotor skill or communication...
September 15, 2016: Journal of Endourology
Vasileios I Metaxas, Gerasimos A Messaris, George D Gatzounis, George S Panayiotakis
Cervical discectomy and fusion (CDF) is a minimally invasive procedure, where the accurate placement of the implants is accomplished using fluoroscopic guidance. Therefore, the evaluation of the radiation dose becomes mandatory. The purpose of the current study was to assess patient dose during fluoroscopically guided anterior and/or posterior CDF procedures. Thirty-three patients undergoing single or multiple-level CDF were studied using a mobile C-arm system. Data regarding fluoroscopy time (FT), air kerma area product (KAP) and cumulative dose (CD) were recorded...
September 9, 2016: Radiation Protection Dosimetry
Quirina M B de Ruiter, Johannes B Reitsma, Frans L Moll, Joost A van Herwaarden
PURPOSE: To investigate the total fluoroscopy time and radiation exposure dose during endovascular aortic repairs using mobile, fixed, or fixed C-arms with 3-dimensional image fusion (3D-IF). METHODS: A systematic search was performed to identify original articles reporting fluoroscopy time (FT) and the kerma area product (KAP) during endovascular aortic repairs. Data were grouped by noncomplex or complex (fenestrated, branched, or chimney) repairs and stratified by type of C-arm...
September 8, 2016: Journal of Endovascular Therapy
M Hackl, S Lappen, W F Neiss, M Scaal, L P Müller, K Wegmann
BACKGROUND: Olecranon osteotomy is an established approach for the treatment of distal humerus fractures. It should be performed through the bare area of the proximal ulna to avoid iatrogenic cartilage lesions. OBJECTIVES: The goal of this study was to analyze the anatomy of the proximal ulna with regard to the bare area and, thereby, to optimize the hitting area of the bare area when performing olecranon osteotomy. MATERIALS AND METHODS: The bare areas of 30 embalmed forearm specimens were marked with a radiopaque wire and visualized three-dimensionally with a mobile C‑arm...
October 2016: Der Orthopäde
Alexander Seitel, Samira Sojoudi, Jill Osborn, Abtin Rasoulian, Saman Nouranian, Victoria A Lessoway, Robert N Rohling, Purang Abolmaesumi
Spinal needle injections are guided by fluoroscopy or palpation, resulting in radiation exposure and/or multiple needle re-insertions. Consequently, guiding these procedures with live ultrasound has become more popular, but images are still challenging to interpret. We introduce a guidance system based on augmentation of ultrasound images with a patient-specific 3-D surface model of the lumbar spine. We assessed the feasibility of the system in a study on 12 patients. The system could accurately provide augmentations of the epidural space and the facet joint for all subjects...
September 1, 2016: Ultrasound in Medicine & Biology
Bill Temes, Steve Karas, James Manwill
A 47-year-old woman was referred to physical therapy with a diagnosis of lumbar radiculopathy. Weight-bearing flexion/extension radiographs showed no change in a 13-mm (at L5-S1) spondylolisthesis measured with a neutral posture. Physical therapy with a focus on flexion-biased stabilization exercises was initiated. After failing to improve after 6 weeks, her referring physician ordered magnetic resonance imaging, which revealed a 6-mm spondylolisthesis in a supine position. Additionally, the physical therapist performed an anterior stability test of L5 on S1 under C-arm fluoroscopy, which demonstrated a palpable shift of S1 posteriorly that was measured on imaging as a change from a 13-mm to a 17-mm spondylolisthesis...
September 2016: Journal of Orthopaedic and Sports Physical Therapy
Cong Xue, Xin An, Ye Cao, Tanhuan Chen, Wei Yang, Yingfei Deng, Hui Han, Xiaoyu Teng, Fangjian Zhou, Yanxia Shi
PURPOSE: The purpose of this study was to evaluate the effectiveness and toxicity of capecitabine (C) chemotherapy regimen with or without (w/o) docetaxel (D) in patients with advanced urothelial carcinoma (UC). RESULTS: Clinical benefit rate were similar in two arms (C arm vs DC arm: 38.9% vs 45.5%, p = 0.411). There were two cases achieved partial response in DC arm. In C arm, the median PFS was 3.0 months (95% CI 2.5-3.5 months) and median OS was 11.3 months (95% CI 8...
August 26, 2016: Oncotarget
Casper Beijst, Mattijs Elschot, Sandra van der Velden, Hugo W A M de Jong
BACKGROUND: Simultaneous real-time fluoroscopic and nuclear imaging could benefit image-guided (oncological) procedures. To this end, a hybrid modality is currently being developed by our group, by combining a c-arm with a gamma camera and a four-pinhole collimator. Accurate determination of the system parameters that describe the position of the x-ray tube, x-ray detector, gamma camera, and collimators is crucial to optimize image quality. The purpose of this study was to develop a calibration method that estimates the system parameters used for reconstruction...
December 2016: EJNMMI Physics
Go Yoshida, Koji Sato, Tokumi Kanemura, Toshiki Iwase, Daisuke Togawa, Yukihiro Matsuyama
STUDY DESIGN: Retrospective. PURPOSE: This study aims to investigate the accuracy of the oblique fluoroscopic view, based on preoperative computed tomography (CT) images for accurate placement of lumbosacral percutaneous pedicle screws (PPS). OVERVIEW OF LITERATURE: Although PPS misplacement has been reported as one of the main complications in minimally invasive spine surgery, there is no comparative data on the misplacement rate among different fluoroscopic techniques, or comparing such techniques with open procedures...
August 2016: Asian Spine Journal
Korgün Ökmen, Burcu Metin Ökmen
BACKGROUND CONTEXT: Epidural steroid injection is commonly used in patients with chronic low back pain. Applying a mixture of alocal anesthetic (LA) and steroid using the interlaminar (IL), transforaminal (TF), and caudal techniques is a preferred approach. PURPOSE: The present study aims to investigate the efficacy of IL epidural steroid (LES) administration in patients with multi-level lumbar disc pathology (LDP), and to assess the possible correlation of the procedure success with age and body mass index (BMI)...
August 20, 2016: Spine Journal: Official Journal of the North American Spine Society
Dechao Jiao, Na Xie, Gang Wu, JianZhuang Ren, Xinwei Han
BACKGROUND: Metastasis to the adrenal glands is frequent in patients with various cancers and adrenal gland biopsy is routinely performed using ultrasound or computed tomographic (CT) guidance. However, this method is technically challenging, especially in the case of small masses. PURPOSE: To determine whether the new real-time stereotactic needle guidance technique C-arm cone-beam CT (CBCT) allows safe and accurate biopsy of adrenal gland masses, especially those in hard-to-reach anatomical locations...
August 22, 2016: Acta Radiologica
Xiang Wang, Severine Habert, Christian Schulte Zu Berge, Pascal Fallavollita, Nassir Navab
X-ray is still the essential imaging for many minimally-invasive interventions. Overlaying X-ray images with an optical view of the surgery scene has been demonstrated to be an efficient way to reduce radiation exposure and surgery time. However, clinicians are recommended to place the X-ray source under the patient table while the optical view of the real scene must be captured from the top in order to see the patient, surgical tools, and the surgical site. With the help of a RGB-D (red-green-blue-depth) camera, which can measure depth in addition to color, the 3D model of the real scene is registered to the X-ray image...
October 1, 2016: Computers in Biology and Medicine
N Rotter, B Schmitz, F Sommer, S Röhrer, P J Schuler, F Bischof, M O Scheithauer, T K Hoffmann
BACKGROUND: Cochlear implantation in routine cases with normal anatomy is commonly performed without intraoperative image guidance. Revision cochlear implantation as well as surgery in malformations require not only a precise understanding of the underlying complex anatomy, but surgeons need to transform two-dimensional computed tomography (2D CT) scans into the surgical field and use this information for intraoperative surgical navigation. So far, information about the exact position of the electrode during insertion cannot be provided to the surgeon...
August 17, 2016: HNO
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"