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https://www.readbyqxmd.com/read/28081006/latent-feature-representation-with-depth-directional-long-term-recurrent-learning-for-breast-masses-in-digital-breast-tomosynthesis
#1
Dae Hoe Kim, Seong Tae Kim, Jung Min Chang, Yong Man Ro
Characterization of masses in computer-aided detection systems for digital breast tomosynthesis (DBT) is an important step to reduce false positive (FP) rates. To effectively differentiate masses from FPs in DBT, discriminative mass feature representation is required. In this paper, we propose a new latent feature representation boosted by depth directional long-term recurrent learning for characterizing malignant masses. The proposed network is designed to encode mass characteristics in two parts. First, 2D spatial image characteristics of DBT slices are encoded as a slice feature representation by convolutional neural network (CNN)...
January 12, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28076252/a-clinical-aid-for-detecting-skin-cancer-the-triage-amalgamated-dermoscopic-algorithm-tada
#2
T Rogers, M L Marino, S W Dusza, S Bajaj, R P Usatine, M A Marchetti, A A Marghoob
PURPOSE: Family physicians (FPs) frequently evaluate skin lesions but may not have the necessary training to accurately and confidently identify lesions that require skin biopsy or specialist referral. We evaluated the diagnostic performance of a new, simplified dermoscopy algorithm for skin cancer detection. METHODS: In this cross-sectional, observation study, attendees of a dermoscopy course evaluated 50 polarized dermoscopy images of skin lesions (27 malignant and 23 benign) using the Triage Amalgamated Dermoscopic Algorithm (TADA)...
November 2016: Journal of the American Board of Family Medicine: JABFM
https://www.readbyqxmd.com/read/28074901/live-visualization-of-genomic-loci-with-bifc-tale
#3
Huan Hu, Hongmin Zhang, Sheng Wang, Miao Ding, Hui An, Yingping Hou, Xiaojing Yang, Wensheng Wei, Yujie Sun, Chao Tang
Tracking the dynamics of genomic loci is important for understanding the mechanisms of fundamental intracellular processes. However, fluorescent labeling and imaging of such loci in live cells have been challenging. One of the major reasons is the low signal-to-background ratio (SBR) of images mainly caused by the background fluorescence from diffuse full-length fluorescent proteins (FPs) in the living nucleus, hampering the application of live cell genomic labeling methods. Here, combining bimolecular fluorescence complementation (BiFC) and transcription activator-like effector (TALE) technologies, we developed a novel method for labeling genomic loci (BiFC-TALE), which largely reduces the background fluorescence level...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28069521/validity-of-simplified-versus-standard-self-report-measures-of-pain-intensity-in-preschool-aged-children-undergoing-venipuncture
#4
Anthony Emmott, Nicholas West, Guohai Zhou, Dustin Dunsmuir, Carolyne J Montgomery, Gillian R Lauder, Carl L von Baeyer
: There is inadequate age-specific data to support the use of current self-report pain scales in 3- and 4-year-old children. Most preschool-aged children also lack the necessary cognitive development to use standard scales. We aimed to evaluate the validity and feasibility of two novel simplified scales (Simplified Faces Pain Scale, S-FPS; Simplified Concrete Ordinal Scale, S-COS) for preschool-aged children. These simplified scales used a two-step self-report method: children were first asked whether they have pain (yes/no); only if yes, then pain intensity was self-reported using a 3-point scale with visual aids signifying mild/moderate/severe...
January 6, 2017: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/28063486/a-high-throughput-fluorometric-assay-for-lipid-protein-binding
#5
W Cho, Y Hu, K Baek, H Kim
An increasing number of intracellular and extracellular proteins are shown to interact with membrane lipids under physiological conditions. For rapid and robust quantitative measurement of lipid-protein interaction, we developed a sensitive fluorescence quenching-based assay that is universally applicable to all proteins and lipids. The assay employs fluorescence protein (FP)-tagged proteins whose fluorescence emission intensity is decreased when they bind vesicles containing quenching lipids. This simple assay can be performed with a fluorescence plate reader or a spectrofluorometer and optimized for different proteins with various combinations of FPs and quenching lipids...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28062819/maternity-care-services-provided-by-family-physicians-in-rural-hospitals
#6
Richard A Young
BACKGROUND: The purpose of this study was to describe how many rural family physicians (FPs) and other types of providers currently provide maternity care services, and the requirements to obtain privileges. METHODS: Chief executive officers of rural hospitals were purposively sampled in 15 geographically diverse states with significant rural areas in 2013 to 2014. Questions were asked about the provision of maternity care services, the physicians who perform them, and qualifications required to obtain maternity care privileges...
January 2017: Journal of the American Board of Family Medicine: JABFM
https://www.readbyqxmd.com/read/28055858/icap-an-individualized-model-combining-gaze-parameters-and-image-based-features-to-predict-radiologists-decisions-while-reading-mammograms
#7
Ziba Gandomkar, Kevin Tay, William Ryder, Patrick C Brennan, Claudia Mello-Thoms
This study introduces an individualized tool for identifying mammogram interpretation errors, called eye-Computer Assisted Perception (iCAP). iCAP consists of two modules, one which processes areas marked by radiologists as suspicious for cancer and classifies these as False Positive (FP) or True Positive (TP) decisions, while the second module classifies fixated but not marked locations as False Negative (FN) or True-Negative (TN) decisions. iCAP relies on both radiologists' gaze-related parameters, extracted from eye tracking data, and image-based features...
December 28, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28055118/fret-in-a-synthetic-flavin-and-bilin-binding-protein
#8
Julian Simon, Aba Losi, Kai-Hong Zhao, Wolfgang Gärtner
The last decade has seen development and application of a large number of novel fluorescence-based techniques that have revolutionized fluorescence microscopy in life sciences. Preferred tags for such applications are genetically encoded fluorescent proteins (FP), mostly derivatives of the green fluorescent protein (GFP). Combinations of FPs with wavelength-separated absorption/fluorescence properties serve as excellent tools for molecular interaction studies, e.g., protein-protein complexes or enzyme-substrate complexes, based on the FRET phenomenon (Förster resonance energy transfer)...
January 5, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28048904/su-g-bra-02-development-of-a-learning-based-block-matching-algorithm-for-ultrasound-tracking-in-radiotherapy
#9
A Shepard, B Bednarz
PURPOSE: To develop an ultrasound learning-based tracking algorithm with the potential to provide real-time motion traces of anatomy-based fiducials that may aid in the effective delivery of external beam radiation. METHODS: The algorithm was developed in Matlab R2015a and consists of two main stages: reference frame selection, and localized block matching. Immediately following frame acquisition, a normalized cross-correlation (NCC) similarity metric is used to determine a reference frame most similar to the current frame from a series of training set images that were acquired during a pretreatment scan...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048767/su-f-i-77-radiation-dose-in-cardiac-catheterization-procedures-impact-of-a-systematic-reduction-in-pulsed-fluoroscopy-frame-rate
#10
C Schultz, S Dixon
PURPOSE: To evaluate whether one small systematic reduction in fluoroscopy frame rate has a significant effect on the total air kerma and/or dose area product for diagnostic and interventional cardiac catheterization procedures. METHODS: The default fluoroscopy frame rate (FFR) was lowered from 15 to 10 fps in 5 Siemens™ Axiom Artis cardiac catheterization labs (CCL) on July 1, 2013. A total of 7212 consecutive diagnostic and interventional CCL procedures were divided into two study groups: 3602 procedures from 10/1/12 -6/30/13 with FFR of 15 fps; and 3610 procedures 7/1/13 - 3/31/14 at 10 fps...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047937/tu-fg-brb-12-real-time-visualization-of-discrete-spot-scanning-proton-therapy-beam-for-quality-assurance
#11
Y Matsuzaki, C Jenkins, Y Yang, T Yoshimura, Y Fujii, K Umegaki, L Xing
PURPOSE: With the growing adoption of proton beam therapy there is an increasing need for effective and user-friendly tools for performing quality assurance (QA) measurements. The speed and versatility of spot-scanning proton beam (PB) therapy systems present unique challenges for traditional QA tools. To address these challenges a proof-of-concept system was developed to visualize, in real-time, the delivery of individual spots from a spot-scanning PB in order to perform QA measurements...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047298/tu-h-campus-tep2-01-a-comparison-of-noninvasive-techniques-to-assess-radiation-induced-lung-damage-in-mice
#12
A Rubinstein, C Kingsley, A Melancon, R Tailor, J Pollard, M Guindani, D Followill, J Hazle, L Court
PURPOSE: To evaluate the use of post-irradiation changes in respiratory rate and CBCT-based morphology as predictors of survival in mice. METHODS: C57L/J mice underwent whole-thorax irradiation with a Co-60 beam to four different doses [0Gy (n=3), 9Gy (n=5), 11Gy (n=7), and 13Gy (n=5)] in order to induce varying levels of pneumonitis. Respiratory rate measurements, breath-hold CBCTs, and free-breathing CBCTs were acquired pre-irradiation and at six time points between two and seven months post-irradiation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047178/th-ab-202-12-the-first-clinical-implementation-of-a-real-time-six-degree-of-freedom-tracking-system-during-radiation-therapy
#13
D Nguyen, J Kim, R O'Brien, C Huang, J Booth, P Greer, K Legge, P Poulsen, J Martin, P Keall
PURPOSE: In current practice, imaging is typically performed prior to treatment; the cancer target motion during treatment is unknown. We present the first clinical implementation of real time Kilovoltage Intrafraction Monitoring (KIM) system which tracks the cancer target translational and rotational motions during treatment. METHODS: KIM technology: KIM estimates the 3D position of the target tumour based on segmented 2D positions of the three implanted fiducials in each of the kV images (125 kV, 10 mA at 11 fps) taken continuously during the treatment arc...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046623/tu-fg-209-06-quantitative-evaluation-of-the-temporal-performance-of-clinical-fluoroscopic-imaging-systems-the-temporal-modulation-transfer-function-tmtf
#14
T Richards, S Mann, E Samei
PURPOSE: Measure the temporal modulation transfer function (TMTF) of clinical fluoroscopic flat panel imaging systems in order to accurately quantify their performance for temporally sensitive clinical tasks. METHODS: Copper blades (0.76 mm thick, 6 cm radius) with precision-machined edges were manufactured and mounted on a voltage regulated DC motor apparatus. Images were acquired with the blade apparatus positioned at the center of the detector matrix and set in motion at a constant rotational velocity (0...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046493/th-ab-202-02-real-time-verification-and-error-detection-for-mlc-tracking-deliveries-using-an-electronic-portal-imaging-device
#15
B J Zwan, E Colvill, J Booth, D J O'Connor, P Keall, P B Greer
PURPOSE: The added complexity of the real-time adaptive multi-leaf collimator (MLC) tracking increases the likelihood of undetected MLC delivery errors. In this work we develop and test a system for real-time delivery verification and error detection for MLC tracking radiotherapy using an electronic portal imaging device (EPID). METHODS: The delivery verification system relies on acquisition and real-time analysis of transit EPID image frames acquired at 8.41 fps...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046391/su-d-brc-07-system-design-for-a-3d-volumetric-scintillation-detector-using-scmos-cameras
#16
C Darne, D Robertson, F Alsanea, S Beddar
PURPOSE: The purpose of this project is to build a volumetric scintillation detector for quantitative imaging of 3D dose distributions of proton beams accurately in near real-time. METHODS: The liquid scintillator (LS) detector consists of a transparent acrylic tank (20×20×20 cm(3) ) filled with a liquid scintillator that when irradiated with protons generates scintillation light. To track rapid spatial and dose variations in spot scanning proton beams we used three scientific-complementary metal-oxide semiconductor (sCMOS) imagers (2560×2160 pixels)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28044343/computer-aided-detection-of-retained-surgical-needles-from-postoperative-radiographs
#17
Aunnasha Sengupta, Lubomir Hadjiiski, Heang-Ping Chan, Kenny Cha, Nikolaos Chronis, Theodore C Marentis
PURPOSE: Foreign objects, such as surgical sponges, needles, sutures, and other surgical instruments, retained in the patient's body can have dire consequences in terms of patient mortality as well as legal and financial penalties. We propose computer-aided detection (CAD) on postoperative radiographs as a potential solution to reduce the chance of retained foreign objects (RFOs) after surgery, thus alleviating one of the major concerns for patient safety in the operation room. A CAD system can function as a second pair of eyes or a prescreener for the surgeon and radiologist, depending on the CAD system design and the workflow...
November 21, 2016: Medical Physics
https://www.readbyqxmd.com/read/28040341/the-influence-of-vowels-on-vocal-fold-dynamics-in-the-tenor-s-passaggio
#18
Matthias Echternach, Fabian Burk, Marie Köberlein, Michael Burdumy, Michael Döllinger, Bernhard Richter
INTRODUCTION: The influence of vowels on the frequency region where registration events in male voices usually occur (passaggio) has not yet been clarified. Particularly, for tenors who frequently have to sing across the passaggio, it might be assumed that the vowel quality has an influence on the stability of phonation. METHODS: In this investigation, six professionally trained Western classical tenors performed a glide from A3 (220 Hz) to A4 (440 Hz) and were recorded using high-speed videoendoscopy at 20,000 fps via transnasal flexible endoscopy...
December 28, 2016: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/28024954/primary-care-physicians-perspective-on-financial-issues-and-adult-immunization-in-the-era-of-the-affordable-care-act
#19
Laura P Hurley, Megan C Lindley, Mandy A Allison, Lori A Crane, Michaela Brtnikova, Brenda L Beaty, Megan Snow, Carolyn B Bridges, Allison Kempe
BACKGROUND: Financial barriers to adult vaccination are poorly understood. Our objectives were to assess among general internists (GIM) and family physicians (FP) shortly after Affordable Care Act (ACA) implementation: (1) proportion of adult patients deferring or refusing vaccines because of cost and frequency of physicians not recommending vaccines for financial reasons; (2) satisfaction with reimbursement for vaccine purchase and administration by payer type; (3) knowledge of Medicare coverage of vaccines; and (4) awareness of vaccine-specific provisions of the ACA...
December 23, 2016: Vaccine
https://www.readbyqxmd.com/read/28018724/gpu-accelerated-real-time-confocal-fluorescence-lifetime-imaging-microscopy-flim-based-on-the-analog-mean-delay-amd-method
#20
Byungyeon Kim, Byungjun Park, Seungrag Lee, Youngjae Won
We demonstrated GPU accelerated real-time confocal fluorescence lifetime imaging microscopy (FLIM) based on the analog mean-delay (AMD) method. Our algorithm was verified for various fluorescence lifetimes and photon numbers. The GPU processing time was faster than the physical scanning time for images up to 800 × 800, and more than 149 times faster than a single core CPU. The frame rate of our system was demonstrated to be 13 fps for a 200 × 200 pixel image when observing maize vascular tissue. This system can be utilized for observing dynamic biological reactions, medical diagnosis, and real-time industrial inspection...
December 1, 2016: Biomedical Optics Express
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