Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 989 for “"Scans"”.
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Comparison between Ceph Analysis on Lateral Cephs, CBCT Scans, and MRI Scans
… cephs, cone beam computed tomography (CBCT) scans, and MR scans. Methods: Lateral cephs, CBCTs, and MRIs were taken on 22 patients. 3 separate readers traced the images and the data was analyzed using Bland-Altman plots. Results: The Bland-Altman plots indicated that the correlation between …
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The registration of multimodality medical scans
… registration, or alignment, of multiple medical scans can provide a plethora of new information about a patient beyond what can be gained from studying the individual scans in isolation. This added information can increase the accuracy in specifying regions of interest, help in radiation therapy …
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Improved statistical quantitation of dynamic PET scans
… parametric imaging extracted from dynamic PET scans. The non-parametric residue mapping (NPRM) procedure has been constructed by a fully automatic process incorporating data-adaptive segmentation, non-parametric residue analysis of segment data and voxel-level kinetic mapping scheme. Based on …
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Feature preserving smoothing of 3D surface scans
With the increasing use of geometry scanners to create 3D models, there is a rising need for effective denoising of data captured with these devices. This thesis presents new methods for smoothing scanned data, based on extensions of the bilateral filter to 3D. The bilateral filter is a non-linear, …
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Comparing Nasolabial Measures Using Casts and Facial Scans
… measurements on nasal casts and facial scans in infants with non-syndromic clefts. Data: Two types of clinical records obtained prior to and post- presurgical: (1) digital scans of nasal casts (N = 35); (2) 3dMD facial scans (N = 69); 34 of which had repeated facial scans on the same …
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3D organ property mapping using freehand ultrasound scans
… clinicians with dynamic feedback during freehand scans; specifically, it dynamically updates the underlying structural or property map to reflect high and low uncertainty regions. This allows clinicians to repopulate regions within additional scans. Lastly, the method also allows for the …
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Computation of Breast Ptosis from 3D Scans of Torso
… for the assessment of breast ptosis using 3D scans of the torso. Experimental results suggest that 3D features are successful for objectively categorizing breast ptosis with high accuracy and precision.
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Multi-atlas segmentation in head and neck CT scans
… of segmenting structures in head and neck CT scans, to minimize time spent on manual contouring of structures of interest. We focus on the brainstem and left and right parotids. To generate contours for an unlabeled image, we employ an atlas of labeled training images. We register each of …
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Analyzing the Consistency of Scoring Porotic Hyperostosis From 3D Scans
<p>The use of 3D scans is becoming more and more common in the field of bioarchaeology. They alleviate the need to travel, allow for larger sample sizes, and can help preserve bones with pathologies on them which make them more fragile. Though there are major benefits with using 3D scanning of …
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A 3D Deep Learning Architecture for Denoising Low-Dose CT Scans
… quality of low-dose computed tomography (LDCT) scans. Although LDCT scans are advantageous for reducing radiation exposure, they inherently suffer from reduced image quality. Our novel 3D DL architecture addresses this issue by effectively enhancing LDCT images to achieve parity with the quality …
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Measurement and Applicants of Incidental Coronary Calcium on Chest CT Scans
The general metadata -- e.g., title, author, abstract, subject headings, etc. -- is publicly available, but access to the submitted files is restricted to UT Southwestern campus access and/or authorized UT Southwestern users.
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Exploring Cranial Macromorphoscopics from Adult Computed Tomography Scans Using an Anatomage Table
… samples. This paper uses computed tomography scans of adults to test the efficacy of using the protocol developed by Stull et al. (2021), to collect macromorphoscopic (MMS) trait data from subadult computed tomography scans. This paper not only tests the potential application of these …
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Assessing Movement of Fish Through Spectral Analysis of Otolith Life History Scans
… movement have been estimated using life-history scans of the chemical signatures encoded in fish otoliths (ear stones). I provide a quantitative approach to examining life history scan data using spectral analysis, which retrospectively measures the movement timing for individual fish. Sagittal …
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Effective dose estimation for U.S. Army soldiers undergoing multiple computed tomography scans
Diagnosing the severity of blunt trauma injuries is difficult and involves the use of diagnostic radiological scanning. The primary diagnostic radiology modality used for assessing these injuries is computed tomography (CT). CT delivers more radiation dose than other diagnostic scanning modalities. …
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Matching optical coherence tomography fingerprint scans using an iterative closest point pipeline
Identifying people from their fingerprints is based on well established technology. However, a number of challenges remain, notably overcoming the low feature density of the surface fingerprint and suboptimal feature matching. 2D contact based fingerprint scanners offer low security performance, …
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Computerized Ultrasonic Raytracing Model for C-scans of Solid Steel Bridge Pins
… can then be analyzed/compared with the field C-scans to determine the closest match of a flaw or a wear groove inside the bridge pin. This helps in deciding if the condition of the pin is acceptable.
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Stress Estimation From Borehole Scans For Prediction Of Excavation Overbreak In Brittle Rock
In the field of geomechanics, one of the most important considerations during design is the state of stress that exists at the location of a project. Despite this, stress is often the most poorly understood site characteristic, given the current challenges in accurately measuring it. This stems …
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Automatic trajectory generation for mobile-manipulators using 3D LiDAR scans of unknown surfaces
… Library (PCL) to accurately register point cloud scans of the drift from before and after shotcrete application and produces thickness estimates of the entire shotcrete area. Estimating shotcrete thickness allows for verification to ensure worker safety and eliminates the human error present in …
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Method for Kalman Filtering Pose Estimates from Lidar Scans During the Landing Phase
… with relative pose data extracted from Lidar scans using an Extended Kalman Filter. The results show that the proposed system can accurately estimate the state in the Z and X axes while further improvements are required to increase the accuracy of the Y axis and the orientation.
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Magnetic optical bearing (MOB) design for mirror wavelength scans in a spaceborne interferometer
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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