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Journal of Medical Imaging

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https://www.readbyqxmd.com/read/29564370/modeling-sequential-context-effects-in-diagnostic-interpretation-of-screening-mammograms
#1
Folami Alamudun, Paige Paulus, Hong-Jun Yoon, Georgia Tourassi
Prior research has shown that physicians' medical decisions can be influenced by sequential context, particularly in cases where successive stimuli exhibit similar characteristics when analyzing medical images. This type of systematic error is known to psychophysicists as sequential context effect as it indicates that judgments are influenced by features of and decisions about the preceding case in the sequence of examined cases, rather than being based solely on the peculiarities unique to the present case...
July 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29564369/search-pattern-training-for-evaluation-of-central-venous-catheter-positioning-on-chest-radiographs
#2
William F Auffermann, Elizabeth A Krupinski, Srini Tridandapani
The goal of this research was to examine whether search pattern training for central line positioning on chest radiographs (CXRs) improves the ability of healthcare trainees and practitioners to identify malpositioned central venous catheters. Two sets of CXRs with central catheters were shown; half of the images contained catheters that were appropriately positioned, half that were malpositioned. Subjects were asked to: mark the tip of the catheter using the simulated radiology workstations, indicate their confidence in tip localization, and state whether the catheter was appropriately positioned or malpositioned...
July 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29531970/quantifying-the-costs-of-interruption-during-diagnostic-radiology-interpretation-using-mobile-eye-tracking-glasses
#3
Trafton Drew, Lauren H Williams, Booth Aldred, Marta E Heilbrun, Satoshi Minoshima
What are the costs and consequences of interruptions during diagnostic radiology? The cognitive psychology literature suggests that interruptions lead to an array of negative consequences that could hurt patient outcomes and lead to lower patient throughput. Meanwhile, observational studies have both noted a strikingly high rate of interruptions and rising number of interruptions faced by radiologists. There is some observational evidence that more interruptions could lead to worse patient outcomes: Balint et al...
July 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29531969/blood-vessel-segmentation-in-modern-wide-field-retinal-images-in-the-presence-of-additive-gaussian-noise
#4
Morteza Modarresi Asem, Iman Sheikh Oveisi, Mona Janbozorgi
Retinal blood vessels indicate some serious health ramifications, such as cardiovascular disease and stroke. Thanks to modern imaging technology, high-resolution images provide detailed information to help analyze retinal vascular features before symptoms associated with such conditions fully develop. Additionally, these retinal images can be used by ophthalmologists to facilitate diagnosis and the procedures of eye surgery. A fuzzy noise reduction algorithm was employed to enhance color images corrupted by Gaussian noise...
July 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29250571/estimability-index-for-volume-quantification-of-homogeneous-spherical-lesions-in-computed-tomography
#5
Ehsan Samei, Marthony Robins, Baiyu Chen, Greeshma Agasthya
Volume of lung nodules is an important biomarker, quantifiable from computed tomography (CT) images. The usefulness of volume quantification, however, depends on the precision of quantification. Experimental assessment of precision is time consuming. A mathematical estimability model was used to assess the quantification precision of CT nodule volumetry in terms of an index ([Formula: see text]), incorporating image noise and resolution, nodule properties, and segmentation software. The noise and resolution were characterized in terms of noise power spectrum and task transfer function...
July 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29250570/estimating-detectability-index-in-vivo-development-and-validation-of-an-automated-methodology
#6
Taylor Brunton Smith, Justin Solomon, Ehsan Samei
This study's purpose was to develop and validate a method to estimate patient-specific detectability indices directly from patients' CT images (i.e., in vivo ). The method extracts noise power spectrum (NPS) and modulation transfer function (MTF) resolution properties from each patient's CT series based on previously validated techniques. These are combined with a reference task function (10-mm disk lesion with [Formula: see text] HU contrast) to estimate detectability indices for a nonprewhitening matched filter observer model...
July 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29250569/influence-of-radiology-expertise-on-the-perception-of-nonmedical-images
#7
Brendan Kelly, Louise A Rainford, Mark F McEntee, Eoin C Kavanagh
Identifying if participants with differing diagnostic accuracy and visual search behavior during radiologic tasks also differ in nonradiologic tasks is investigated. Four clinician groups with different radiologic experience were used: a reference expert group of five consultant radiologists, four radiology registrars, five senior house officers, and six interns. Each of the four clinician groups is known to have significantly different performance in the identification of pneumothoraces in chest x-ray. Each of the 20 participants was shown 6 nonradiologic images (3 maps and 3 sets of geometric shapes) and was asked to perform search tasks...
July 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29662920/assessing-ct-acquisition-parameters-with-visual-search-model-observers
#8
Zohreh Karbaschi, Howard C Gifford
A principal difference between the channelized Hotelling (CH) and visual-search (VS) model observers is how they respond to noise texture in images. We compared the two observers in lesion-detection studies to evaluate linear and angular sampling parameters for CT. Simulated lung images were generated from a single two-dimensional mathematical torso phantom containing circular lesions of fixed radius and relative contrast. Projection datasets were produced for two detector pixel sizes and from 15 to 128 projections at 15 and 65 M counts per set...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29662919/development-and-clinical-validation-of-a-hybrid-method-for-semiautomated-left-ventricle-endocardial-and-epicardial-boundary-extraction-on-cine-magnetic-resonance-images
#9
Mahammed Messadi, Abdelhafid Bessaid, Denis Mariano-Goulart, Fayçal Ben Bouallègue
We describe a hybrid method for left ventricle (LV) endocardial and epicardial segmentation on cardiac magnetic resonance (CMR) images requiring minimal operator intervention. Endocardium extraction results from the union of three independent estimations based on adaptive thresholding, region growing, and active contour with Chan-Vese energy function. Epicardium segmentation relies on conditional morphological dilation of the endocardial mask followed by active contour optimization. The proposed method was first evaluated using an open access database of 18 CMR for which expert manual contouring was available...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29662918/gifted-demons-deformable-image-registration-with-local-structure-preserving-regularization-using-supervoxels-for-liver-applications
#10
Bartłomiej W Papież, James M Franklin, Mattias P Heinrich, Fergus V Gleeson, Michael Brady, Julia A Schnabel
Deformable image registration, a key component of motion correction in medical imaging, needs to be efficient and provides plausible spatial transformations that reliably approximate biological aspects of complex human organ motion. Standard approaches, such as Demons registration, mostly use Gaussian regularization for organ motion, which, though computationally efficient, rule out their application to intrinsically more complex organ motions, such as sliding interfaces. We propose regularization of motion based on supervoxels, which provides an integrated discontinuity preserving prior for motions, such as sliding...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29651451/toward-dynamic-lumbar-puncture-guidance-using-needle-based-single-element-ultrasound-imaging
#11
Haichong K Zhang, Younsu Kim, Melissa Lin, Mateo Paredes, Karun Kannan, Abhay Moghekar, Nicholas J Durr, Emad M Boctor
Lumbar punctures (LPs) are interventional procedures that are used to collect cerebrospinal fluid. Since the target window is small, physicians have limited success conducting the procedure. The procedure is especially difficult for obese patients due to the increased distance between bone and skin surface. We propose a simple and direct needle insertion platform, enabling image formation by sweeping a needle with a single ultrasound element at the tip. The needle-shaped ultrasound transducer can not only sense the distance between the tip and a potential obstacle, such as bone, but also visually locate the structures by combining transducer location tracking and synthetic aperture focusing...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29594184/photoacoustic-based-catheter-tracking-simulation-phantom-and-in-vivo-studies
#12
Alexis Cheng, Younsu Kim, Yuttana Itsarachaiyot, Haichong K Zhang, Clifford R Weiss, Russell H Taylor, Emad M Boctor
Catheters are commonly used in many procedures and tracking and localizing them is critical to patient safety and surgical success. The standard of care for catheter tracking is with the use of fluoroscopy. Alternatives using conventional tracking technologies such as electromagnetic trackers have been previously explored. This work explores the use of an emerging imaging modality, photoacoustics, as a means for tracking. A piezoelectric (PZT) sensor is placed at the tip of the catheter, allowing it to receive the acoustic signals generated from photoacoustic markers due to the photoacoustic effect...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29594183/patient-specific-cardiac-phantom-for-clinical-training-and-preprocedure-surgical-planning
#13
Justin Laing, John Moore, Reid Vassallo, Daniel Bainbridge, Maria Drangova, Terry Peters
Minimally invasive mitral valve repair procedures including MitraClip® are becoming increasingly common. For cases of complex or diseased anatomy, clinicians may benefit from using a patient-specific cardiac phantom for training, surgical planning, and the validation of devices or techniques. An imaging compatible cardiac phantom was developed to simulate a MitraClip® procedure. The phantom contained a patient-specific cardiac model manufactured using tissue mimicking materials. To evaluate accuracy, the patient-specific model was imaged using computed tomography (CT), segmented, and the resulting point cloud dataset was compared using absolute distance to the original patient data...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29564368/image-registration-assessment-in-radiotherapy-image-guidance-based-on-control-chart-monitoring
#14
Wenyao Xia, Stephen L Breen
Image guidance with cone beam computed tomography in radiotherapy can guarantee the precision and accuracy of patient positioning prior to treatment delivery. During the image guidance process, operators need to take great effort to evaluate the image guidance quality before correcting a patient's position. This work proposes an image registration assessment method based on control chart monitoring to reduce the effort taken by the operator. According to the control chart plotted by daily registration scores of each patient, the proposed method can quickly detect both alignment errors and image quality inconsistency...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29531968/development-of-a-modular-fluorescence-overlay-tissue-imaging-system-for-wide-field-intraoperative-surgical-guidance
#15
John Quan Minh Nguyen, Melanie McWade, Giju Thomas, Bryce T Beddard, Jennifer L Herington, Bibhash C Paria, Herbert S Schwartz, Jennifer L Halpern, Ginger E Holt, Anita Mahadevan-Jansen
Fluorescence imaging is a well-established optical modality that has been used to localize and track fluorophores in vivo and has demonstrated great potential for surgical guidance. Despite the variety of fluorophores currently being researched, many existing intraoperative fluorescence imaging systems are specifically designed for a limited number of applications. We present a modular wide-field fluorescence overlay tissue imaging system for intraoperative surgical guidance that is comprised of commercially available standardized components...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29531967/radiomic-signature-of-infiltration-in-peritumoral-edema-predicts-subsequent-recurrence-in-glioblastoma-implications-for-personalized-radiotherapy-planning
#16
Saima Rathore, Hamed Akbari, Jimit Doshi, Gaurav Shukla, Martin Rozycki, Michel Bilello, Robert Lustig, Christos Davatzikos
Standard surgical resection of glioblastoma, mainly guided by the enhancement on postcontrast T1-weighted magnetic resonance imaging (MRI), disregards infiltrating tumor within the peritumoral edema region (ED). Subsequent radiotherapy typically delivers uniform radiation to peritumoral FLAIR-hyperintense regions, without attempting to target areas likely to be infiltrated more heavily. Noninvasive in vivo delineation of the areas of tumor infiltration and prediction of early recurrence in peritumoral ED could assist in targeted intensification of local therapies, thereby potentially delaying recurrence and prolonging survival...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29531966/lesion-modeling-characterization-and-visualization-for-image-guided-cardiac-ablation-therapy-monitoring
#17
Cristian A Linte, Jon J Camp, Maryam E Rettmann, Dieter Haemmerich, Mehmet K Aktas, David T Huang, Douglas L Packer, David R Holmes
In spite of significant efforts to improve image-guided ablation therapy, a large number of patients undergoing ablation therapy to treat cardiac arrhythmic conditions require repeat procedures. The delivery of insufficient thermal dose is a significant contributor to incomplete tissue ablation, in turn leading to the arrhythmia recurrence. Ongoing research efforts aim to better characterize and visualize RF delivery to monitor the induced tissue damage during therapy. Here, we propose a method that entails modeling and visualization of the lesions in real-time...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29487889/probabilistic-visual-and-electromagnetic-data-fusion-for-robust-drift-free-sequential-mosaicking-application-to-fetoscopy
#18
Marcel Tella-Amo, Loic Peter, Dzhoshkun I Shakir, Jan Deprest, Danail Stoyanov, Juan Eugenio Iglesias, Tom Vercauteren, Sebastien Ourselin
The most effective treatment for twin-to-twin transfusion syndrome is laser photocoagulation of the shared vascular anastomoses in the placenta. Vascular connections are extremely challenging to locate due to their caliber and the reduced field-of-view of the fetoscope. Therefore, mosaicking techniques are beneficial to expand the scene, facilitate navigation, and allow vessel photocoagulation decision-making. Local vision-based mosaicking algorithms inherently drift over time due to the use of pairwise transformations...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29487888/follow-the-light-projector-based-augmented-reality-intracorporeal-system-for-laparoscopic-surgery
#19
Philip Edgcumbe, Rohit Singla, Philip Pratt, Caitlin Schneider, Christopher Nguan, Robert Rohling
A projector-based augmented reality intracorporeal system (PARIS) is presented that includes a miniature tracked projector, tracked marker, and laparoscopic ultrasound (LUS) transducer. PARIS was developed to improve the efficacy and safety of laparoscopic partial nephrectomy (LPN). In particular, it has been demonstrated to effectively assist in the identification of tumor boundaries during surgery and to improve the surgeon's understanding of the underlying anatomy. PARIS achieves this by displaying the orthographic projection of the cancerous tumor on the kidney's surface...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29487887/design-and-validation-of-an-open-source-library-of-dynamic-reference-frames-for-research-and-education-in-optical-tracking
#20
Alisa Brown, Ali Uneri, Tharindu De Silva, Amir Manbachi, Jeffrey H Siewerdsen
Dynamic reference frames (DRFs) are a common component of modern surgical tracking systems; however, the limited number of commercially available DRFs poses a constraint in developing systems, especially for research and education. This work presents the design and validation of a large, open-source library of DRFs compatible with passive, single-face tracking systems, such as Polaris stereoscopic infrared trackers (NDI, Waterloo, Ontario). An algorithm was developed to create new DRF designs consistent with intra- and intertool design constraints and convert to computer-aided design (CAD) files suitable for three-dimensional printing...
April 2018: Journal of Medical Imaging
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