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Journal of Medical Imaging

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https://www.readbyqxmd.com/read/29795777/cognitive-processing-differences-of-experts-and-novices-when-correlating-anatomy-and-cross-sectional-imaging
#1
Lonie R Salkowski, Rosemary Russ
The ability to correlate anatomical knowledge and medical imaging is crucial to radiology and as such, should be a critical component of medical education. However, we are hindered in our ability to teach this skill because we know very little about what expert practice looks like, and even less about novices' understanding. Using a unique simulation tool, this research conducted cognitive clinical interviews with experts and novices to explore differences in how they engage in this correlation and the underlying cognitive processes involved in doing so...
July 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29795776/paired-split-plot-designs-of-multireader-multicase-studies
#2
Weijie Chen, Qi Gong, Brandon D Gallas
The widely used multireader multicase ROC study design for comparing imaging modalities is the fully crossed (FC) design: every reader reads every case of both modalities. We investigate paired split-plot (PSP) designs that may allow for reduced cost and increased flexibility compared with the FC design. In the PSP design, case images from two modalities are read by the same readers, thereby the readings are paired across modalities. However, within each modality, not every reader reads every case. Instead, both the readers and the cases are partitioned into a fixed number of groups and each group of readers reads its own group of cases-a split-plot design...
July 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29750178/consultation-and-citation-rates-for-prior-imaging-studies-and-documents-in-radiology
#3
Tamara Miner Haygood, Barry Mullins, Jia Sun, Behrang Amini, Priya Bhosale, Hyunseon C Kang, Tara Sagebiel, Bilal Mujtaba
Frequently, the consensus conclusion after quality assurance conferences in radiology is that whatever mistake was made could have been avoided if more prior images or documents had been consulted. It is generally assumed that anything that was not specifically cited in the report had not been consulted. Is it actually safe to assume that an image or document that is not cited was also not consulted? It is this question that this investigation addresses. In this Institutional Review Board-approved study, one observer watched the board-certified radiologists while they interpreted imaging studies and issued reports...
July 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29564370/modeling-sequential-context-effects-in-diagnostic-interpretation-of-screening-mammograms
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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/29900185/portable-impulse-radar-detector-for-breast-cancer-a-pilot-study
#11
Shinsuke Sasada, Norio Masumoto, Hang Song, Keiko Kajitani, Akiko Emi, Takayuki Kadoya, Koji Arihiro, Takamaro Kikkawa, Morihito Okada
Microwave breast imaging is a painless and nonradiation method. This pilot study aimed to evaluate the detective capability and feasibility of a prototype of a portable breast cancer detector using a radar-based imaging system. Five patients with histologically confirmed breast cancers with a minimum diameter of 1 cm were enrolled in this study. The antenna array dome of the device was placed on the breast of the patient in a supine position for 15 min per single examination. The primary endpoint was a detection rate of breast cancers...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29900184/multicell-migration-tracking-within-angiogenic-networks-by-deep-learning-based-segmentation-and-augmented-bayesian-filtering
#12
Mengmeng Wang, Lee-Ling Sharon Ong, Justin Dauwels, H Harry Asada
Cell migration is a key feature for living organisms. Image analysis tools are useful in studying cell migration in three-dimensional (3-D) in vitro environments. We consider angiogenic vessels formed in 3-D microfluidic devices (MFDs) and develop an image analysis system to extract cell behaviors from experimental phase-contrast microscopy image sequences. The proposed system initializes tracks with the end-point confocal nuclei coordinates. We apply convolutional neural networks to detect cell candidates and combine backward Kalman filtering with multiple hypothesis tracking to link the cell candidates at each time step...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29845091/positron-emission-tomography-based-assessment-of-metabolic-gradient-and-other-prognostic-features-in-sarcoma
#13
Eric Wolsztynski, Finbarr O'Sullivan, Eimear Keyes, Janet O'Sullivan, Janet F Eary
Intratumoral heterogeneity biomarkers derived from positron emission tomography (PET) imaging with fluorodeoxyglucose (FDG) are of interest for a number of cancers, including sarcoma. A range of radiomic texture variables, adapted from general methodologies for image analysis, has shown promise in the setting. In the context of sarcoma, our group introduced an alternative model-based approach to the measurement of heterogeneity. In this approach, the heterogeneity of a tumor is characterized by the extent to which the 3-D FDG uptake pattern deviates from a simple elliptically contoured structure...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29845090/detection-of-small-traumatic-hemorrhages-using-a-computer-generated-average-human-brain-ct
#14
Liza Afzali-Hashemi, Marieke Hazewinkel, Marleen C Tjepkema-Cloostermans, Michel J A M van Putten, Cornelis H Slump
Computed tomography is a standard diagnostic imaging technique for patients with traumatic brain injury (TBI). A limitation is the poor-to-moderate sensitivity for small traumatic hemorrhages. A pilot study using an automatic method to detect hemorrhages [Formula: see text] in diameter in patients with TBI is presented. We have created an average image from 30 normal noncontrast CT scans that were automatically aligned using deformable image registration as implemented in Elastix software. Subsequently, the average image was aligned to the scans of TBI patients, and the hemorrhages were detected by a voxelwise subtraction of the average image from the CT scans of nine TBI patients...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29845089/special-section-guest-editorial-technology-platforms-for-treatment-and-discovery-in-human-systems-novel-work-in-image-guided-procedures-robotic-interventions-and-modeling
#15
Amber Simpson, Michael Miga
This guest editorial introduces the Special Section on Image-Guided Procedures, Robotic Interventions, and Modeling in JMI Vol. 5 Issue 2.
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29750177/error-estimation-of-deformable-image-registration-of-pulmonary-ct-scans-using-convolutional-neural-networks
#16
Koen A J Eppenhof, Josien P W Pluim
Error estimation in nonlinear medical image registration is a nontrivial problem that is important for validation of registration methods. We propose a supervised method for estimation of registration errors in nonlinear registration of three-dimensional (3-D) images. The method is based on a 3-D convolutional neural network that learns to estimate registration errors from a pair of image patches. By applying the network to patches centered around every voxel, we construct registration error maps. The network is trained using a set of representative images that have been synthetically transformed to construct a set of image pairs with known deformations...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29721517/automated-erythrocyte-detection-and-classification-from-whole-slide-images
#17
Darshana Govind, Brendon Lutnick, John E Tomaszewski, Pinaki Sarder
Blood smear is a crucial diagnostic aid. Quantification of both solitary and overlapping erythrocytes within these smears, directly from their whole slide images (WSIs), remains a challenge. Existing software designed to accomplish the computationally extensive task of hematological WSI analysis is too expensive and is widely unavailable. We have thereby developed a fully automated software targeted for erythrocyte detection and quantification from WSIs. We define an optimal region within the smear, which contains cells that are neither too scarce/damaged nor too crowded...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29721516/model-based-beamforming-with-plane-wave-synthesis-in-medical-ultrasound
#18
Kazuyuki Dei, Jaime Tierney, Brett Byram
We are interested in examining how our model-based beamforming algorithm, referred to as aperture-domain model image reconstruction (ADMIRE), performs on plane wave sequences in conjunction with synthetic aperture beamforming. We also aim to identify the impact of ADMIRE applied before and after synthetic focusing. We employed simulated phantoms using Field II and tissue-mimicking phantoms to evaluate ADMIRE as applied to synthetic sequencing. We generated plane wave images with and without synthetic aperture focusing (SAF) and measured contrast and contrast-to-noise ratio (CNR)...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29721515/combination-of-computer-extracted-shape-and-texture-features-enables-discrimination-of-granulomas-from-adenocarcinoma-on-chest-computed-tomography
#19
Mahdi Orooji, Mehdi Alilou, Sagar Rakshit, Niha Beig, Mohammad Hadi Khorrami, Prabhakar Rajiah, Rajat Thawani, Jennifer Ginsberg, Christopher Donatelli, Michael Yang, Frank Jacono, Robert Gilkeson, Vamsidhar Velcheti, Philip Linden, Anant Madabhushi
Differentiation between benign and malignant nodules is a problem encountered by radiologists when visualizing computed tomography (CT) scans. Adenocarcinomas and granulomas have a characteristic spiculated appearance and may be fluorodeoxyglucose avid, making them difficult to distinguish for human readers. In this retrospective study, we aimed to evaluate whether a combination of radiomic texture and shape features from noncontrast CT scans can enable discrimination between granulomas and adenocarcinomas...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29662920/assessing-ct-acquisition-parameters-with-visual-search-model-observers
#20
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
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