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https://www.readbyqxmd.com/read/28297322/evaluation-of-the-tool-reg-refine-for-user-guided-deformable-image-registration
#1
Perry B Johnson, Kyle R Padgett, Kuan L Chen, Nesrin Dogan
"Reg Refine" is a tool available in the MIM Maestro v6.4.5 platform (www.mimsoftware.com) that allows the user to actively participate in the deformable image registration process. The purpose of this work was to evaluate the efficacy of this tool and investigate strategies for how to apply it effectively. This was done by performing DIR on two publicly available ground-truth models, the Pixel-based Breathing Thorax Model (POPI) for lung, and the Deformable Image Registration Evaluation Project (DIREP) for head and neck...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28296304/low-dose-2-5-mv-cone-beam-computed-tomography-with-thick-csi-flat-panel-imager
#2
Grace Tang, Christopher Moussot, Daniel Morf, Edward Seppi, Howard Amols
Most of the treatment units, both new and old models, are equipped with a megavoltage portal imager but its use for volumetric imaging is limited. This is mainly due to the poor image quality produced by the high-energy treatment beam (>6 MV). A linac at our center is equipped with a prototype 2.5 MV imaging beam. This study evaluates the feasibility of low-dose megavoltage cone-beam imaging with the 2.5 MV beam and a thick cesium iodide detector, which is a high-efficiency imager. Basic imaging properties such as spatial resolution and modulation transfer function were assessed for the 2...
July 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28256441/supine-breast-mri-using-respiratory-triggering
#3
Natasja N Y Janssen, Leon C Ter Beek, Claudette E Loo, Gonneke Winter-Warnars, Charlotte A H Lange, Marjolein van Loveren, Tanja Alderliesten, Jan-Jakob Sonke, Jasper Nijkamp
RATIONALE AND OBJECTIVES: This study aims to evaluate if navigator-echo respiratory-triggered magnetic resonance acquisition can acquire supine high-quality breast magnetic resonance imaging (MRI). MATERIALS AND METHODS: Supine respiratory-triggered magnetic resonance imaging (Trig-MRI) was compared to supine non-Trig-MRI to evaluate breathing-induced motion artifacts (group 1), and to conventional prone non-Trig-MRI (group 2, 16-channel breast coil), all at 3T...
February 27, 2017: Academic Radiology
https://www.readbyqxmd.com/read/28240950/computed-tomographic-assessment-of-sternal-lymph-node-dimensions-and-attenuation-in-healthy-dogs
#4
Milan Milovancev, Sarah Nemanic, Gerd Bobe
OBJECTIVE To assess dimensions and attenuation of sternal lymph nodes (SLNs) observed by means of CT in healthy dogs. ANIMALS 12 healthy adult research dogs. PROCEDURES Precontrast and postcontrast enhanced CT of the thorax was performed on each dog. Objective and subjective contrast-enhanced CT measurements were obtained. RESULTS By use of CT, 2 SLNs were identified in 10 of the 12 dogs and 1 SLN was identified in 2. Median SLN length, height, and width were 8.5 mm (range, 4 to 22 mm), 6.0 mm (range, 3 to 10 mm), and 5...
March 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28198752/monoenergetic-dual-energy-computed-tomographic-imaging-cardiothoracic-applications
#5
Lukas Lenga, Moritz H Albrecht, Ahmed E Othman, Simon S Martin, Doris Leithner, Tommaso D'Angelo, Christophe Arendt, Jan-Erik Scholtz, Carlo N De Cecco, U Joseph Schoepf, Thomas J Vogl, Julian L Wichmann
Monoenergetic imaging is an increasingly used reconstruction technique in postprocessing of dual-energy computed tomography (DECT). The main advantage of this technique is the ability to substantially increase image contrast of structures with uptake of iodinated contrast material. Although monoenergetic imaging was mainly used in oncological DECT applications, recent research has further demonstrated its role in vascular imaging. Using this dedicated postprocessing algorithm, image contrast of vascular structures in the thorax can be increased, a drastic reduction of contrast material is feasible, and even beam-hardening artifacts can be reduced...
February 14, 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28195001/design-and-analysis-of-a-tendon-based-computed-tomography-compatible-robot-with-remote-center-of-motion-for-lung-biopsy
#6
Yunpeng Yang, Shan Jiang, Zhiyong Yang, Wei Yuan, Huaisu Dou, Wei Wang, Daguang Zhang, Yuan Bian
Nowadays, biopsy is a decisive method of lung cancer diagnosis, whereas lung biopsy is time-consuming, complex and inaccurate. So a computed tomography-compatible robot for rapid and precise lung biopsy is developed in this article. According to the actual operation process, the robot is divided into two modules: 4-degree-of-freedom position module for location of puncture point is appropriate for patient's almost all positions and 3-degree-of-freedom tendon-based orientation module with remote center of motion is compact and computed tomography-compatible to orientate and insert needle automatically inside computed tomography bore...
February 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28126307/molecular-contrast-enhanced-ultrasound-imaging-of-radiation-induced-p-selectin-expression-in-healthy-mice-colon
#7
Ahmed El Kaffas, Kevin Smith, Pooja Pradhan, Steven Machtaler, Huaijun Wang, Rie von Eyben, Jürgen K Willmann, Dimitre Hristov
PURPOSE: To evaluate the feasibility of using molecular contrast-enhanced ultrasound (mCEUS) to image radiation (XRT)-induced expression of cell adhesion molecules that mediate inflammatory response to XRT in healthy mouse colon tissue. METHODS AND MATERIALS: The colons of male BALB/c mice (aged 6-8 weeks, n=9) were irradiated with 14 Gy using a Kimtron IC-225 x-ray irradiator operating at 225 kV/13.0 mA at a dose rate of 0.985 Gy/min. The head and thorax regions were shielded during irradiation...
March 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28121374/lobe-based-image-reconstruction-in-electrical-impedance-tomography
#8
Benjamin Schullcke, Bo Gong, Sabine Krueger-Ziolek, Merryn Tawhai, Andy Adler, Ullrich Mueller-Lisse, Knut Moeller
PURPOSE: Electrical Impedance Tomography (EIT) is an imaging modality used to generate two-dimensional cross-sectional images representing impedance change in the thorax. The impedance of lung tissue changes with change in air content of the lungs; hence, EIT can be used to examine regional lung ventilation in patients with abnormal lungs. In lung EIT, electrodes are attached around the circumference of the thorax to inject small alternating currents and measure resulting voltages. In contrast to X-ray computed tomography (CT), EIT images do not depict a thorax slice of well defined thickness, but instead visualize a lens-shaped region around the electrode plane, which results from diffuse current propagation in the thorax...
February 2017: Medical Physics
https://www.readbyqxmd.com/read/28048525/we-ab-207a-11-respiratory-motion-guided-4dcbct-a-step-towards-controlling-4dcbct-image-quality
#9
R O'Brien, U Stankovic, P Keall, J Sonke
PURPOSE: We have developed a method, called respiratory motion guided 4DCBCT (RMG-4DCBCT), in which the gantry speed and projection frequency are varied in response to the patient's real-time respiratory signal to eliminate streaking artifacts and to suppress duplicate projections in 4DCBCT images. In 2015, we realized RMG-4DCBCT on an Elekta Synergy linear accelerator with a mechanical relay to suppress projections and a potentiometer to adjust the gantry speed in response to the patient's real-time respiratory signal...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048240/su-f-j-117-impact-of-motion-artifacts-on-image-quality-and-accuracy-of-tumor-motion-reconstruction-in-4d-ct-on-rails-and-mv-cbct-scans-a-phantom-study
#10
T Lin, C Ma
PURPOSE: To compare and quantify respiratory motion artifacts in images from free breathing 4D-CT-on-Rails(CTOR) and those from MV-Cone-beam-CT(MVCB) and facilitate respiratory motion guided radiation therapy. METHODS: 4D-CTOR: Siemens Somatom CT-on-Rails system with Anzai belt loaded with pressure sensor load cells. 4D scans were performed in helical mode, pitch 0.1, gantry rotation time 0.5s, 1.5mm slice thickness, 120kVp, 400 mAs. Normal and fast breathing (>12rpm) scanning protocols were investigated...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047532/th-ef-bra-05-a-method%C3%A3-of-near-real-time-4d-mri-using-volumetric-dynamic-keyhole-vdk-in-the-presence-of-respiratory-motion-for-mr-guided-radiotherapy
#11
B Lewis, S Kim, T Kim
PURPOSE: To develop a novel method that enables 4D MR imaging in near real-time for continuous monitoring of tumor motion in MR-guided radiotherapy. METHODS: This method is mainly based on an idea of expanding dynamic keyhole to full volumetric imaging acquisition. In the VDK approach introduced in this study, a library of peripheral volumetric k-space data is generated in given number of phases (5 and 10 in this study) in advance. For 4D MRI at any given time, only volumetric central k-space data are acquired in real-time and combined with pre-acquired peripheral volumetric k-space data in the library corresponding to the respiratory phase (or amplitude)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047456/mo-de-207a-06-ecg-gated-ct-reconstruction-for-a-c-arm-inverse-geometry-x-ray-system
#12
J M Slagowski, Dap Dunkerley
PURPOSE: To obtain ECG-gated CT images from truncated projection data acquired with a C-arm based inverse geometry fluoroscopy system, for the purpose of cardiac chamber mapping in interventional procedures. METHODS: Scanning-beam digital x-ray (SBDX) is an inverse geometry fluoroscopy system with a scanned multisource x-ray tube and a photon-counting detector mounted to a C-arm. In the proposed method, SBDX short-scan rotational acquisition is performed followed by inverse geometry CT (IGCT) reconstruction and segmentation of contrast-enhanced objects...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28027768/the-evolution-of-radiation-dose-over-time-measurement-of-a-patient-cohort-undergoing-whole-body-examinations-on-three-computer-tomography-generations
#13
Roy P Marcus, Elise Koerner, Roland C Aydin, Dominik Zinsser, Tobias Finke, Christian J Cyron, Fabian Bamberg, Konstantin Nikolaou, Mike Notohamiprodjo
OBJECTIVES: To evaluate and compare the radiation dose and image quality of whole-body-CT (WBCT) performed on the 3rd-generation dual-source-CT (DSCT) with 2nd-generation DSCT and 64-slices-Single-Source-CT (SSCT) in a large patient cohort. MATERIAL AND METHODS: Using a monitoring and tracking software 1451, 747 and 1861 patients scanned with a one-spiral-thorax-abdomen-pelvis-CT-examination on a 3rd-, 2nd-generation DSCT and SSCT, respectively, were extracted from the PACS server...
January 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28005510/case-237-renal-cell-carcinoma-with-osseous-metaplasia
#14
Billy Ming Hei Lai, Solomon Yig Joon Ka, Wai Kuen Kan, Man Wah Lam, Tang Fei Lee, Yun Hoi Lui, Jennifer Lai San Khoo
History A 47-year-old man presented with palpitations and decreased exercise tolerance. A peripheral blood smear revealed anemia, thrombocytopenia, and blast cells, and a diagnosis of acute myeloid leukemia was made. Immunohistochemistry revealed positivity for cluster of differentiation (or CD) markers, which have been reported to be associated with an increased risk of extramedullary leukemic involvement. Thus, contrast material-enhanced computed tomography (CT) of the thorax, abdomen, and pelvis was requested to enable exclusion of any extramedullary extension of leukemia...
January 2017: Radiology
https://www.readbyqxmd.com/read/27973925/a-reduced-gastric-corpus-microvascular-blood-flow-during-ivor-lewis-esophagectomy-detected-by-laser-speckle-contrast-imaging-technique
#15
Rikard Ambrus, Lars B Svendsen, Niels H Secher, Kim Rünitz, Hans-Jørgen Frederiksen, Morten B S Svendsen, Mette Siemsen, Steen C Kofoed, Michael P Achiam
BACKGROUND: Reduced microvascular blood flow is related to anastomotic insufficiency following esophagectomy, emphasizing a need for intraoperative monitoring of the microcirculation. This study evaluated if laser speckle contrast imaging (LSCI) was able to detect intraoperative changes in gastric microcirculation. METHODS: Gastric microcirculation was assessed prior to and after reconstruction of gastric continuity in 25 consecutive patients operated for adenocarcinoma with open Ivor-Lewis esophagectomy while hemodynamic variables were recorded...
April 2017: Scandinavian Journal of Gastroenterology
https://www.readbyqxmd.com/read/27936890/incidental-findings-in-the-skeletal-musculature-on-computed-tomography
#16
Dominik Schramm, Annkathrin Justus, Andreas G Bach, Alexey Surov
OBJECTIVE: The purpose of this study was to analyze intramuscular incidental findings identified on CT in a large patient cohort. METHODS: In the time period from 2010 to 2015, a total of 44,794 patients with several diagnoses were investigated by CT. Only those patients who underwent body CT including the neck, thorax, abdomen and pelvic regions after the i.v. application of a contrast medium were involved in the study. There were 4085 patients. On further analysis, only patients with intramuscular findings (IFs) incidentally detected on CT were included...
February 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/27919724/reference-levels-for-central-venous-pressure-and-pulmonary-artery-occlusion-pressure-monitoring-in-the-lateral-position
#17
In-Kyung Song, Soohan Ro, Ji-Hyun Lee, Eun-Hee Kim, Hee-Soo Kim, Jae-Hyon Bahk, Jin-Tae Kim
OBJECTIVE: To investigate reference levels for central venous pressure or pulmonary artery occlusion pressure monitoring in a lateral position. DESIGN: Retrospective observational study. SETTING: A tertiary university hospital. PARTICIPANTS: A total of 204 adults who underwent chest computed tomography scan in the 90° lateral position from November 2006 to February 2015. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: Distances from the mid-sternum to the uppermost and lowermost blood levels of both atria were measured...
September 13, 2016: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/27908174/respiratory-motion-compensation-for-simultaneous-pet-mr-based-on-highly-undersampled-mr-data
#18
Christopher M Rank, Thorsten Heußer, Andreas Wetscherek, Martin T Freitag, Oliver Sedlaczek, Heinz-Peter Schlemmer, Marc Kachelrieß
PURPOSE: Positron emission tomography (PET) of the thorax region is impaired by respiratory patient motion. To account for motion, the authors propose a new method for PET/magnetic resonance (MR) respiratory motion compensation (MoCo), which uses highly undersampled MR data with acquisition times as short as 1 min/bed. METHODS: The proposed PET/MR MoCo method (4D jMoCo PET) uses radial MR data to estimate the respiratory patient motion employing MR joint motion estimation and image reconstruction with temporal median filtering...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27894354/do-mosquitoes-transmit-the-avian-malaria-like-parasite-haemoproteus-an-experimental-test-of-vector-competence-using-mosquito-saliva
#19
Rafael Gutiérrez-López, Josué Martínez-de la Puente, Laura Gangoso, Jiayue Yan, Ramón C Soriguer, Jordi Figuerola
BACKGROUND: The life-cycle of many vector-borne pathogens includes an asexual replication phase in the vertebrate host and sexual reproduction in the insect vector. However, as only a small array of parasites can successfully develop infective phases inside an insect, few insect species are competent vectors for these pathogens. Molecular approaches have identified the potential insect vectors of blood parasites under natural conditions. However, the effectiveness of this methodology for verifying mosquito competence in the transmission of avian malaria parasites and related haemosporidians is still under debate...
November 28, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27891001/rigid-bronchoscopic-management-of-acute-respiratory-failure-in-a-30-year-old-woman
#20
Karan Madan, Ashesh Dhungana, Neha Kawatra Madan, Anant Mohan, Vijay Hadda, Rakesh Garg, Deepali Jain, Randeep Guleria
A 30-year-old woman presented with a history of progressive shortness of breath, cough, and hoarseness. Stridor was audible on examination. Chest X-ray showed normal lung fields and contrast-enhanced computed tomography thorax showed lower tracheal occlusion with endoluminal growth. Diagnostic flexible bronchoscopy demonstrated multiple whitish glistening nodules over both vocal cords and lower tracheal occlusion by whitish nodular growth. In view of critical central airway obstruction, rigid bronchoscopy and excision of the lower tracheal growth were performed...
November 2016: Lung India: Official Organ of Indian Chest Society
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