keyword
MENU ▼
Read by QxMD icon Read
search

Flat panel detectors

keyword
https://www.readbyqxmd.com/read/29175828/retrograde-3d-rotational-venography-3drv-for-venous-sinus-stent-placement-in-idiopathic-intracranial-hypertension
#1
Christopher C Young, Ryan P Morton, Basavaraj V Ghodke, Michael R Levitt
BACKGROUND: Dural venous sinus stenting has emerged as an effective and durable treatment for idiopathic intracranial hypertension (IIH). Improved visualization of the venous sinuses can improve stent placement. METHODS: We present two cases of IIH treated with venous sinus stenting in which retrograde three-dimensional rotational venography (3DRV) provided superior anatomical details of the venous sinuses for optimal sizing and positioning of stent. RESULTS: Comparison of pre-stent 3DRV with post-stent contrast-enhanced flat panel detector CT allowed confirmation of stent placement and the result of stenosis dilation...
November 24, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29171067/towards-scintillator-high-gain-avalanche-rushing-photoconductor-active-matrix-flat-panel-imager-sharp-amfpi-initial-fabrication-and-characterization
#2
James R Scheuermann, Adrian Howansky, Marc Hansroul, Sébastien Léveillé, Kenkichi Tanioka, Wei Zhao
PURPOSE: We present the first prototype Scintillator High Gain Avalanche Rushing Photoconductor Active Matrix Flat Panel Imager (SHARP-AMFPI). This detector includes a layer of avalanche amorphous Selenium (a-Se) (HARP) as the photoconductor in an indirect detector to amplify the signal and reduce the effects of electronic noise to obtain quantum noise limited images for low dose applications. It is the first time avalanche a-Se has been used in a solid-state imaging device and poses as a possible solution to eliminate the effects of electronic noise, which is crucial for low-dose imaging performance of AMFPI...
November 24, 2017: Medical Physics
https://www.readbyqxmd.com/read/29159881/characterization-of-photon-counting-multi-slit-breast-tomosynthesis
#3
Karl Berggren, Björn Cederström, Mats Lundqvist, Erik Fredenberg
PURPOSE: It has been shown that breast tomosynthesis may improve sensitivity and specificity compared to 2D mammography, resulting in increased detection-rate of cancers or lowered call-back rates. The purpose of this study is to characterize a spectral photon-counting multi-slit breast tomosynthesis system that is able to do single-scan spectral imaging with multiple collimated x-ray beams. The system differs in many aspects compared to conventional tomosynthesis using energy-integrating flat-panel detectors...
November 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/29118787/radiation-exposure-during-neurointerventional-procedures-in-modern-biplane-angiographic-systems-a-single-site-experience
#4
Ameer E Hassan, Sophie Amelot
Background and Purpose: Per the ALARA principle, reducing the dose delivered to both patients and staff must be a priority for endovascular therapists, who should monitor their own practice. We evaluated patient exposure to radiation during common neurointerventions performed with a recent flat-panel detector angiographic system and compared our results with those of recently published studies. Methods: All consecutive patients who underwent a diagnostic cerebral angiography or intervention on 2 modern flat-panel detector angiographic biplane systems (Innova IGS 630, GE Healthcare, Chalfont St Giles, UK) from February to November 2015 were retrospectively analyzed...
October 2017: Interventional Neurology
https://www.readbyqxmd.com/read/29116055/improvement-of-single-detector-proton-radiography-by-incorporating-intensity-of-time-resolved-dose-rate-functions
#5
Rongxiao Zhang, Kyung-Wook Jee, Ethan W Cascio, Gregory C Sharp, Jacob B Flanz, Hsiao-Ming Lu
Proton radiography, which images patients with the same type of particles as what they are to be treated with, is a promising approach to image guidance and water equivalent path length (WEPL) verification in proton radiation therapy. We have shown recently that proton radiographs could be obtained by measuring time-resolved dose rate functions (DRF) using an x-ray amorphous silicon flat panel. The WEPL values were derived solely from the root-mean-square (RMS) of DRFs while the intensity information in the DRFs was filtered out...
November 8, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29095489/modeling-and-evaluation-of-a-high-resolution-cmos-detector-for-cone-beam-ct-of-the-extremities
#6
Qian Cao, Alejandro Sisniega, Michael Brehler, J Webster Stayman, John Yorkston, Jeffrey H Siewerdsen, Wojciech Zbijewski
PURPOSE: Quantitative assessment of trabecular bone microarchitecture in extremity cone-beam CT (CBCT) would benefit from the high spatial resolution, low electronic noise, and fast scan time provided by complementary metal-oxide semiconductor (CMOS) x-ray detectors. We investigate the performance of CMOS sensors in extremity CBCT, in particular with respect to potential advantages of thin (<0.7 mm) scintillators offering higher spatial resolution. METHODS: A cascaded systems model of a CMOS x-ray detector incorporating the effects of CsI:Tl scintillator thickness was developed...
November 2, 2017: Medical Physics
https://www.readbyqxmd.com/read/29092468/x-ray-microtomography-system-for-small-and-light-samples-using-a-flat-panel-detector
#7
A B Vilar, T M P Dos Santos, A S Machado, D F Oliveira, S R Azeredo, R T Lopes
A low-cost system able to perform microtomography of samples such as teeth, insects, or other small materials and low atomic numbers is presented. For this, a small flat panel type sensor was used. The process of characterization of the detector is detailed, as well as its main characteristics. The electromechanical control and the software used are also described. The advantages, some limitations, and comparisons with commercial systems are presented along with some three-dimensional volumetric reconstruction of different materials that served as samples during the development of the system...
October 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29064378/technical-characterization-of-five-x-ray-detectors-for-paediatric-radiography-applications
#8
Nicholas W Marshall, Marleen H Smet, Maarten Hofmans, Herman Pauwels, Thomas De Clerq, Hilde Bosmans
Physical image quality of five x-ray detectors used in the paediatric imaging department is characterized with the aim of establishing the range/scope of imaging performance provided by these detectors for neonatal imaging. Two computed radiography (CR) detectors (MD4.0 powder imaging plate (PIP) and HD5.0 needle imaging plate (NIP), Agfa HealthCare NV, B-2640 Mortsel, Belgium) and three flat panel detectors (FPD) (the Agfa DX-D35C and DX-D45C and the DRX-2530C (Carestream Health Inc., Rochester - NY 14608, USA)) were assessed...
October 24, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29057772/investigation-of-the-section-thickness-measurement-in-tomosynthesis-by-thin-metal-plate-edge-method
#9
Kaoru Ikeno, Tsunemichi Akita, Kozo Hanai, Yoshihisa Muramatsu
When performing tomosynthesis, the section thickness needs to be set depending on a radiographic part and its diagnostic purpose. However, the section thickness in tomosynthesis has not been clearly defined and its measurement method has not been established yet. In this study, we devised the alternative measurement method to diagnose the section thickness using an edge of thin metal plate, and compared with the simulation results, the wire and bead method reported in the previous papers. The tomographic image of the thin metal plate positioned on the table top inclining 30 degrees, which showed the edge spread function (ESF) of each tomographic height, was taken, and then the line spread function (LSF) was obtained by differentiating the ESF image...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28983677/reduced-dose-c-arm-computed-tomography-applications-at-a-pediatric-institution
#10
Michael Acord, Sphoorti Shellikeri, Seth Vatsky, Abhay Srinivasan, Ganesh Krishnamurthy, Marc S Keller, Anne Marie Cahill
BACKGROUND: Reduced-dose C-arm computed tomography (CT) uses flat-panel detectors to acquire real-time 3-D images in the interventional radiology suite to assist with anatomical localization and procedure planning. OBJECTIVE: To describe dose-reduction techniques for C-arm CT at a pediatric institution and to provide guidance for implementation. MATERIALS AND METHODS: We conducted a 5-year retrospective study on procedures using an institution-specific reduced-dose protocol: 5 or 8 s Dyna Rotation, 248/396 projection images/acquisition and 0...
December 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28959083/characterization-of-continuous-and-pulsed-emission-modes-of-a-hybrid-micro-focus-x-ray-source-for-medical-imaging-applications
#11
Muhammad U Ghani, Molly D Wong, Liqiang Ren, Di Wu, Bin Zheng, John X Rong, Xizeng Wu, Hong Liu
The aim of this study was to quantitatively characterize a micro focus x-ray tube that can operate in both continuous and pulsed emission modes. The micro focus x-ray source (Model L9181-06, Hamamatsu Photonics, Japan) has a varying focal spot size ranging from 16-50 μm as the source output power changes from 10-39 W. We measured the source output, beam quality, focal spot sizes, kV accuracy, spectra shapes and spatial resolution. Source output was measured using an ionization chamber for various tube voltages (kVs) with varying current (μA) and distances...
May 1, 2017: Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
https://www.readbyqxmd.com/read/28958735/an-integrated-system-for-clinical-treatment-verification-of-hdr-prostate-brachytherapy-combining-source-tracking-with-pretreatment-imaging
#12
Ryan L Smith, Max Hanlon, Vanessa Panettieri, Jeremy L Millar, Bronwyn Matheson, Annette Haworth, Rick D Franich
PURPOSE: High-dose-rate (HDR) prostate brachytherapy treatment is usually delivered in one or a few large dose fractions. Poor execution of a planned treatment could have significant clinical impact, as high doses are delivered in seconds, and mistakes in an individual fraction cannot be easily rectified. Given that most potential errors in HDR brachytherapy ultimately lead to a geographical miss, a more direct approach to verification of correct treatment delivery is to directly monitor the position of the source throughout the treatment...
September 22, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28940528/assessment-of-a-photon-counting-detector-for-a-dual-energy-c-arm-angiographic-system
#13
Moiz Ahmad, Rebecca Fahrig, Leland Pung, Martin Spahn, Niko S Köster, Silke Reitz, Teri Moore, Jang-Hwan Choi, Waldo Hinshaw, Yan Xia, Kerstin Müller
PURPOSE: This article presents the implementation and assessment of photon-counting dual-energy x-ray detector technology for angiographic C-arm systems in interventional radiology. METHODS: A photon-counting detector was successfully integrated into a clinical C-arm CT system. Detector performance was assessed using image uniformity metrics in both 2D projections and 3D cone-beam computed tomography (CBCT) images. Uniform exposure fields were acquired to analyze projection images and scans of a homogeneous cylinder phantom were taken to analyze 3D reconstructions...
September 22, 2017: Medical Physics
https://www.readbyqxmd.com/read/28893700/comparison-of-radiation-exposure-during-endovascular-treatment-of-peripheral-arterial-disease-with-flat-panel-detectors-on-mobile-c-arm-vs-fixed-systems
#14
Marie Guillou, Blandine Maurel, Hatem Necib, Pierre-Alexandre Vent, Alain Costargent, Philippe Chaillou, Yann Gouëffic, Adrien Kaladji
PURPOSE: Flat-panel detectors on mobile C-arm (MC-arm) systems are currently challenging fixed C-arm (FC-arm) systems used in hybrid operating rooms. MC-arm systems offer an alternative to FC-arm systems in the endovascular treatment of peripheral arterial disease (PAD) but their efficiency has not been evaluated comparatively. METHODS: Two series of patients undergoing arteriography with intention to treat were included. Each series consisted of two non-randomized groups: an MC-arm group and an FC-arm group...
September 8, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28837233/real-time-tomosynthesis-for-radiation-therapy-guidance
#15
Scott S Hsieh, Lydia W Ng
PURPOSE: Fluoroscopy has been a tool of choice for monitoring treatments or interventions because of its extremely fast imaging times. However, the contrast obtained in fluoroscopy may be insufficient for certain clinical applications. In stereotactic ablative radiation therapy of the lung, fluoroscopy often lacks sufficient contrast for gating treatment. The purpose of this work is to describe and assess a real-time tomosynthesis design that can produce sufficient contrast for guidance of lung tumor treatment within a small field of view...
August 24, 2017: Medical Physics
https://www.readbyqxmd.com/read/28811040/implant-specific-follow-up-imaging-of-treated-intracranial-aneurysms-tof-mra-vs-metal-artifact-reduced-intravenous-flat-panel-computed-tomography-angiography-fpcta
#16
N H Hänsel, G A Schubert, B Scholz, O Nikoubashman, A E Othman, M Wiesmann, R Pjontek, M A Brockmann
AIM: To compare the diagnostic quality of time-of-flight magnetic resonance angiography (TOF-MRA) and metal-artefact-reduction (MAR) flat-panel-detector computed tomography angiography (FPCTA) and to determine the imaging technique best suited for evaluation endovascular and surgically treated aneurysms. METHODS: The image quality of TOF-MRA and MAR-FPCTA of 44 intracranial implants (coiling: n=20; clipping: n=15; coiling + stenting: n=9) in a patient cohort of 25 was evaluated by two independent readers...
August 12, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28760084/optimal-dilution-of-contrast-medium-for-quantitating-parenchymal-blood-volume-using-a-flat-panel-detector
#17
Takumi Kuriyama, Nobuyuki Sakai, Mikiya Beppu, Chiaki Sakai, Hirotoshi Imamura, Iwao Kojima, Katsuhiro Masago, Nobuyuki Katakami
Objective Similar to perfusion studies after acute ischemic stroke, measuring cerebral blood volume (CBV) via C-arm computed tomography before and after therapeutic interventions may help gauge subsequent revascularization. We tested serial dilutions of intra-arterial injectable contrast medium (CM) to determine the optimal CM concentration for quantifying parenchymal blood volume by flat-panel detector imaging (FD-PBV). Methods CM was diluted via saline power injector, instituting time delays for FD-PBV studies...
January 1, 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/28649157/use-of-patient-specific-3d-printed-neurovascular-phantoms-to-evaluate-the-clinical-utility-of-a-high-resolution-x-ray-imager
#18
S V Setlur Nagesh, M Russ, C N Ionita, D Bednarek, S Rudin
Modern 3D printing technology can fabricate vascular phantoms based on an actual human patient with a high degree of precision facilitating a realistic simulation environment for an intervention. We present two experimental setups using 3D printed patient-specific neurovasculature to simulate different disease anatomies. To simulate the human neurovasculature in the Circle of Willis, patient-based phantoms with aneurysms were 3D printed using a Objet Eden 260V printer. Anthropomorphic head phantoms and a human skull combined with acrylic plates simulated human head bone anatomy and x-ray attenuation...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28637959/examination-of-dose-reduction-using-image-noise-reduction-technology-in-cardiovascular-x-ray-systems
#19
Takaya Saijo, Shigenobu Seguchi
The aim of this study is to establish radiation exposure dose reduction protocols during cardiac intervention by decreasing the entrance dose at flat panel detector (FPD) with image quality evaluations. For measuring entrance surface dose (ESD), we have used a Radical 9015 dosimeter (6 cc ion chamber) placed under 20 cm thick acrylic plates at the patient's entrance reference point. We performed an image quality assessment based on quantitative as well as visual evaluation of the images obtained via current and dose reduction protocols...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28632551/comparative-study-of-c-arms-for-intraoperative-3-dimensional-imaging-and-navigation-in-minimally-invasive-spine-surgery-part-i-applicability-and-image-quality
#20
Jan-Helge Klingler, Ronen Sircar, Christian Scheiwe, Evangelos Kogias, Florian Volz, Marie T Krüger, Ulrich Hubbe
STUDY DESIGN: This was a retrospective analysis. OBJECTIVE: This study compares 2 different 3-dimensional (3D) C-arm devices for intraoperative imaging and navigation with regard to clinical applicability and image quality. SUMMARY OF BACKGROUND DATA: Minimally invasive spine surgery requires intraoperative imaging techniques to adequately visualize the unexposed spine. For this purpose, mobile 3D C-arms became available along with the evolution of intraoperative navigation techniques...
July 2017: Clinical Spine Surgery
keyword
keyword
1339
1
2
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"