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https://www.readbyqxmd.com/read/27908185/a-comparison-of-linear-interpolation-models-for-iterative-ct-reconstruction
#1
Katharina Hahn, Harald Schöndube, Karl Stierstorfer, Joachim Hornegger, Frédéric Noo
PURPOSE: Recent reports indicate that model-based iterative reconstruction methods may improve image quality in computed tomography (CT). One difficulty with these methods is the number of options available to implement them, including the selection of the forward projection model and the penalty term. Currently, the literature is fairly scarce in terms of guidance regarding this selection step, whereas these options impact image quality. Here, the authors investigate the merits of three forward projection models that rely on linear interpolation: the distance-driven method, Joseph's method, and the bilinear method...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908167/computer-aided-prognosis-for-cell-death-categorization-and-prediction-in-vivo-using-quantitative-ultrasound-and-machine-learning-techniques
#2
M J Gangeh, A Hashim, A Giles, L Sannachi, G J Czarnota
PURPOSE: At present, a one-size-fits-all approach is typically used for cancer therapy in patients. This is mainly because there is no current imaging-based clinical standard for the early assessment and monitoring of cancer treatment response. Here, the authors have developed, for the first time, a complete computer-aided-prognosis (CAP) system based on multiparametric quantitative ultrasound (QUS) spectroscopy methods in association with texture descriptors and advanced machine learning techniques...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27906334/hyperspectral-face-recognition-using-improved-inter-channel-alignment-based-on-qualitative-prediction-models
#3
Woon Cho, Jinbeum Jang, Andreas Koschan, Mongi A Abidi, Joonki Paik
A fundamental limitation of hyperspectral imaging is the inter-band misalignment correlated with subject motion during data acquisition. One way of resolving this problem is to assess the alignment quality of hyperspectral image cubes derived from the state-of-the-art alignment methods. In this paper, we present an automatic selection framework for the optimal alignment method to improve the performance of face recognition. Specifically, we develop two qualitative prediction models based on: 1) a principal curvature map for evaluating the similarity index between sequential target bands and a reference band in the hyperspectral image cube as a full-reference metric; and 2) the cumulative probability of target colors in the HSV color space for evaluating the alignment index of a single sRGB image rendered using all of the bands of the hyperspectral image cube as a no-reference metric...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27897397/development-and-validation-of-a-septoplasty-training-model-using-3-dimensional-printing-technology
#4
Mahmoud A AlReefi, Lily H P Nguyen, Luc G Mongeau, Bassam Ul Haq, Siddharth Boyanapalli, Nauman Hafeez, Francois Cegarra-Escolano, Marc A Tewfik
BACKGROUND: Providing alternative training modalities may improve trainees' ability to perform septoplasty. Three-dimensional printing has been shown to be a powerful tool in surgical training. The objectives of this study were to explain the development of our 3-dimensional (3D) printed septoplasty training model, to assess its face and content validity, and to present evidence supporting its ability to distinguish between levels of surgical proficiency. METHODS: Imaging data of a patient with a nasal septal deviation was selected for printing...
November 29, 2016: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/27892996/technique-standards-for-skin-lesion-imaging-a-delphi-consensus-statement
#5
Chinmayee Katragadda, Anna Finnane, H Peter Soyer, Ashfaq A Marghoob, Allan Halpern, Josep Malvehy, Harald Kittler, Rainer Hofmann-Wellenhof, Dennis Da Silva, Ivo Abraham, Clara Curiel-Lewandrowski
Importance: Variability in the metrics for image acquisition at the total body, regional, close-up, and dermoscopic levels impacts the quality and generalizability of skin images. Consensus guidelines are indicated to achieve universal imaging standards in dermatology. Objective: To achieve consensus among members of the International Skin Imaging Collaboration (ISIC) on standards for image acquisition metrics using a hybrid Delphi method. Evidence Review: Delphi study with 5 rounds of ratings and revisions until relative consensus was achieved...
November 23, 2016: JAMA Dermatology
https://www.readbyqxmd.com/read/27892977/societal-value-of-surgery-for-facial-reanimation
#6
Peiyi Su, Lisa E Ishii, Andrew Joseph, Jason Nellis, Jacob Dey, Kristin Bater, Patrick J Byrne, Kofi D O Boahene, Masaru Ishii
Importance: Patients with facial paralysis are perceived negatively by society in a number of domains. Society's perception of the health utility of varying degrees of facial paralysis and the value society places on reconstructive surgery for facial reanimation need to be quantified. Objective: To measure health state utility of varying degrees of facial paralysis, willingness to pay (WTP) for a repair, and the subsequent value of facial reanimation surgery as perceived by society...
November 17, 2016: JAMA Facial Plastic Surgery
https://www.readbyqxmd.com/read/27891546/ct-image-quality-in-sinogram-affirmed-iterative-reconstruction-phantom-study-is-there-a-point-of-diminishing-returns
#7
Juan C Infante, Yu Liu, Cynthia K Rigsby
BACKGROUND: In our pediatric practice, we have observed qualitatively limited improvement in the image quality of images generated with sinogram affirmed iterative reconstruction (SAFIRE) compared to series generated with filtered back projection (FBP), particularly in cases near or below a CT dose index volume (CTDIvol) of 1-mGy. OBJECTIVE: To determine whether the image quality advantage of SAFIRE remains constant across clinically used CT dose levels in an American College of Radiology (ACR) CT accreditation phantom including the lower dose range used in pediatric imaging...
November 28, 2016: Pediatric Radiology
https://www.readbyqxmd.com/read/27888423/assessment-of-land-use-and-land-cover-change-using-spatiotemporal-analysis-of-landscape-case-study-in-south-of-tehran
#8
Abutaleb Sabr, Mazaher Moeinaddini, Hossein Azarnivand, Benjamin Guinot
In the recent years, dust storms originating from local abandoned agricultural lands have increasingly impacted Tehran and Karaj air quality. Designing and implementing mitigation plans are necessary to study land use/land cover change (LUCC). Land use/cover classification is particularly relevant in arid areas. This study aimed to map land use/cover by pixel- and object-based image classification methods, analyse landscape fragmentation and determine the effects of two different classification methods on landscape metrics...
December 0: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27864079/temporal-reliability-of-ultra-high-field-resting-state-mri-for-single-subject-sensorimotor-and-language-mapping
#9
Paulo Branco, Daniela Seixas, São Luís Castro
Resting-state fMRI is a well-suited technique to map functional networks in the brain because unlike task-based approaches it requires little collaboration from subjects. This is especially relevant in clinical settings where a number of subjects cannot comply with task demands. Previous studies using conventional scanner fields have shown that resting-state fMRI is able to map functional networks in single subjects, albeit with moderate temporal reliability. Ultra-high resolution (7T) imaging provides higher signal-to-noise ratio and better spatial resolution and is thus well suited to assess the temporal reliability of mapping results, and to determine if resting-state fMRI can be applied in clinical decision making including preoperative planning...
November 15, 2016: NeuroImage
https://www.readbyqxmd.com/read/27863822/surgical-site-infection-reporting-more-than-meets-the-agar
#10
Luke R Putnam, Tiffany G Ostovar-Kermani, Andrea Le Blanc, Kathryn T Anderson, Galit Holzmann-Pazgal, Kevin P Lally, KuoJen Tsao
BACKGROUND/PURPOSE: Surgical site infection (SSI) rate in pediatric appendicitis is a commonly used hospital quality metric. We hypothesized that surveillance of organ-space SSI (OSI) using cultures alone would fail to capture many clinically-important events. METHODS: A prospective, multidisciplinary surveillance program recorded 30-day SSI and hospital length of stay (LOS) for patients <18years undergoing appendectomy for perforated appendicitis from 2012 to 2015...
October 28, 2016: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/27859552/low-pass-imaging-of-dynamic-acquisitions-lida-with-a-group-oriented-registration-goreg-for-proton-mr-imaging-of-lung-ventilation
#11
Andreas Voskrebenzev, Marcel Gutberlet, Till F Kaireit, Frank Wacker, Jens Vogel-Claussen
PURPOSE: To compare low-pass imaging dynamic acquisitions (LIDA) approach in combination with a group-oriented registration (GOREG) scheme with conventional Fourier decomposition (FD). METHODS: Dynamic images of six healthy volunteers and one chronic obstructive pulmonary disease (COPD) patient were acquired on a 1.5 Tesla scanner using a spoiled gradient echo sequence. For the volunteers each slice was acquired during regular (RB) and irregular breathing (IB). For conventional registration (CR), all images were directly registered to the intermediate respiratory position...
November 18, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27853849/measuring-and-improving-the-patient-experience-in-radiology
#12
Olga R Brook, Bettina Siewert, Jeffrey Weinstein, Muneeb Ahmed, Jonathan Kruskal
Recently enacted healthcare legislation and the associated payment reforms have shifted the focus from traditional fee for service models to adding measurable and appreciable value to the patient experience. The value equation links quality to costs, and quality metrics are now directly related to patient outcomes and the patient experience. To participate effectively in this new paradigm requires not only that we provide excellent, timely and appropriate patient-centric care at all times, but that we are able to measure and manage the feedback we obtain from our patients...
November 16, 2016: Abdominal Radiology
https://www.readbyqxmd.com/read/27828202/night-vision-integrated-performance-model-impact-of-a-recent-change-on-the-model-s-predictive-accuracy
#13
Richard Vollmerhausen
The U. S. Army has adopted the targeting task performance (TTP) image quality metric for formal analyses of electro-optical imager performance. The most recent release of the model, NVIPM, changes the way TTP is calculated in order to improve the accuracy of facial identification. Predictions of the original and modified models are compared to both laboratory and field data. The change degrades NVIPM predictive accuracy for the tactical vehicle target set which is often used in hardware procurement specifications...
October 17, 2016: Optics Express
https://www.readbyqxmd.com/read/27826667/is-advanced-neuroimaging-for-neuroradiologists-a-systematic-review-of-the-scientific-literature-of-the-last-decade
#14
Sirio Cocozza, Camilla Russo, Giuseppe Pontillo, Lorenzo Ugga, Antonio Macera, Amedeo Cervo, Maria De Liso, Nilde Di Paolo, Maria Isabella Ginocchio, Flavio Giordano, Giuseppe Leone, Giovanni Rusconi, Arnaldo Stanzione, Francesco Briganti, Mario Quarantelli, Ferdinando Caranci, Alessandra D'Amico, Andrea Elefante, Enrico Tedeschi, Arturo Brunetti
INTRODUCTION: To evaluate if advanced neuroimaging research is mainly conducted by imaging specialists, we investigated the number of first authorships by radiologists and non-radiologist scientists in articles published in the field of advanced neuroimaging in the past 10 years. METHODS: Articles in the field of advanced neuroimaging identified in this retrospective bibliometric analysis were divided in four groups, depending on the imaging technique used. For all included studies, educational background of the first authors was recorded (based on available online curriculum vitae) and classified in subgroups, depending on their specialty...
November 8, 2016: Neuroradiology
https://www.readbyqxmd.com/read/27811392/automatic-detection-of-mlc-relative-position-errors-for-vmat-using-the-epid-based-picket-fence-test
#15
Damianos Christophides, Alex Davies, Mark Fleckney
Multi-leaf collimators (MLCs) ensure the accurate delivery of treatments requiring complex beam fluences like intensity modulated radiotherapy and volumetric modulated arc therapy. The purpose of this work is to automate the detection of MLC relative position errors  ⩾0.5 mm using electronic portal imaging device-based picket fence tests and compare the results to the qualitative assessment currently in use. Picket fence tests with and without intentional MLC errors were measured weekly on three Varian linacs...
December 7, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27806605/technical-note-rod-phantom-analysis-for-comparison-of-pet-detector-sampling-and-reconstruction-methods
#16
Scott D Wollenweber, Brad J Kemp
PURPOSE: This investigation aimed to develop a scanner quantification performance methodology and compare multiple metrics between two scanners under different imaging conditions. Most PET scanners are designed to work over a wide dynamic range of patient imaging conditions. Clinical constraints, however, often impact the realization of the entitlement performance for a particular scanner design. Using less injected dose and imaging for a shorter time are often key considerations, all while maintaining "acceptable" image quality and quantitative capability...
November 2016: Medical Physics
https://www.readbyqxmd.com/read/27782718/patient-specific-quantification-of-image-quality-an-automated-method-for-measuring-spatial-resolution-in-clinical-ct-images
#17
Jeremiah Sanders, Lynne Hurwitz, Ehsan Samei
PURPOSE: To develop and validate an automated technique for evaluating the spatial resolution characteristics of clinical computed tomography (CT) images. METHODS: Twenty one chest and abdominopelvic clinical CT datasets were examined in this study. An algorithm was developed to extract a CT resolution index (RI) analogous to the modulation transfer function from clinical CT images by measuring the edge-spread function (ESF) across the patient's skin. A polygon mesh of the air-skin boundary was created...
October 2016: Medical Physics
https://www.readbyqxmd.com/read/27773459/creation-and-validation-of-a-simulator-for-neonatal-brain-ultrasonography-a-pilot-study
#18
Andy Tsai, Carol E Barnewolt, Sanjay P Prahbu, Reimi Yonekura, Andrew Hosmer, Noah E Schulz, Peter H Weinstock
RATIONALE AND OBJECTIVES: Historically, skills training in performing brain ultrasonography has been limited to hours of scanning infants for lack of adequate synthetic models or alternatives. The aim of this study was to create a simulator and determine its utility as an educational tool in teaching the skills that can be used in performing brain ultrasonography on infants. MATERIALS AND METHODS: A brain ultrasonography simulator was created using a combination of multi-modality imaging, three-dimensional printing, material and acoustic engineering, and sculpting and molding...
October 20, 2016: Academic Radiology
https://www.readbyqxmd.com/read/27771747/the-daily-readiness-huddle-a-process-to-rapidly-identify-issues-and-foster-improvement-through-problem-solving-accountability
#19
Lane F Donnelly, Shirley S Cherian, Kimberly B Chua, Sam Thankachan, Laura A Millecker, Alex G Koroll, George S Bisset
BACKGROUND: Because of the increasing complexities of providing imaging for pediatric health care services, a more reliable process to manage the daily delivery of care is necessary. Objective We describe our Daily Readiness Huddle and the effects of the process on problem identification and improvement. MATERIALS AND METHODS: Our Daily Readiness Huddle has four elements: metrics review, clinical volume review, daily readiness assessment, and problem accountability...
October 22, 2016: Pediatric Radiology
https://www.readbyqxmd.com/read/27769514/characterizing-fluoroscopy-based-kinematic-accuracy-as-a-function-of-pulse-width-and-velocity
#20
Arin M Ellingson, Joseph D Mozingo, Dixon J Magnuson, Mark W Pagnano, Kristin D Zhao
Fluoroscopic imaging has become increasingly popular to investigate total knee arthroplasty kinematics non-invasively - 3D implant models are aligned with 2D image projections, and optimized via an edge-contour alignment technique. Previous studies have quantified the accuracy of this approach, however they do not always adequately address the impact of image collection parameters. A particularly sensitive parameter is the pulse width, or exposure time per frame. At longer pulse widths, more motion is captured in a single frame; this can lead to image blur and subsequent degradation to image edge quality...
October 11, 2016: Journal of Biomechanics
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