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 22 for “"digital radiography"”.
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Assessment and optimisation of digital radiography systems for clinical use
Digital imaging has long been available in radiology in the form of computed tomography (CT), magnetic resonance imaging (MRI) and ultrasound. Initially the transition to general radiography was slow and fragmented but in the last 10-15 years in particular, huge investment by the manufacturers, …
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Digital radiography: image acquisition and scattering reduction in x-ray imaging.
… applications, leading to the appearance of digital image capture devices. Digital technologies introduced the possibility of separating the image acquisition and image processing steps, allowing their individual optimization. This thesis explores both areas, by seeking the improvement in the …
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An evaluation of digital radiography in the imaging of the neonatal chest.
Neonatal chest radiography is an area where there has been very limited research. The introduction of Computed Radiography (CR) has provided a new imaging modality that can be used to acquire neonatal chest radiographs and possibly reduce the radiation dose. The aim of this thesis was to design a …
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Development of a method for automating effective patient diameter estimation for digital radiography
… information relating to the x-ray system and the digital detector.<br/><br/>The computational model uses the Beer-Lambert law. A hypothesis was developed that this would work for clinical exposures despite its single energy photon basis. Values of initial air kerma are estimated from the …
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Detection of crack-like indications in digital radiography by global optimisation of a probabilistic estimation function
A new algorithm for detection of longitudinal crack-like indications in radiographic images is developed in this work. Conventional local detection techniques give unsatisfactory results for this task due to the low signal to noise ratio (SNR ~ 1) of crack-like indications in radiographic images. …
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Automated 3D reconstruction of Lodox Statscan images for forensic application
… projection data from a Lodox Statscan full body digital radiography system, and to produce tools to allow automated generation of information required to perform the tomographic reconstruction.
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An in-vitro comparison of working length determination between a digital system and conventional film when source-film/sensor distance and exposure time are modified
… knowledge of average tooth lengths and/or dental radiography whether digital or conventional is utilized. It is the aim of this study to determine if there is a difference between Schick digital radiography and Kodak Insight conventional film in accurately determining working lengths when …
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Bone Density Measurement via Radiographic Calibration
… (USDA 2001). In human and veterinary medicine, digital radiography represents the primary diagnostic tool the physician uses to diagnose skeletal injury. Advances in digital radiography have provided the veterinarian with opportunities to make both simple and complex radiographic assessments. We …
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Hand X-ray absorptiometry for measurement of bone mineral density on a slot-scanning X-ray imaging system
… ability to evaluate fracture risk. Computed digital absorptiometry (CDA) has also been shown to be very effective at measuring the bone mass in hand bones using an aluminium step wedge as a calibration reference. In this project, the aim was to develop algorithm s for accurate measurement of …
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An in vitro comparison of working length accuracy between a digital system and conventional film when vertical angulation of the object is variable
… knowledge of average tooth lengths and dental radiography. Due to the increasing use of digital radiography in clinical practice, a comparison with conventional film in working length determination is justified. The purpose of this study is to determine if there is a difference between Schick …
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Effective and Efficient Non-Destructive Testing of Large and Complex Shaped Aircraft Structures
… the calculation of the optimum magnification for digital radiography. The formula is applicable for focal spot sizes less than 0.1 mm. 5. A practical method of measuring the detection capabilities of a digital radiographic system by calculating the modulation transfer function and the noise power …
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Digital Radiographic Analysis of Mineral Density of Adjacent Alveolar Bone in Relation to the Molar Translation Rate After Use of Retromolar Implant Anchorage
… movement from the force. Contrast-corrected digital radiography was utilized to investigate the rate of molar translation related to the mineral density of adjacent alveolar bone. It was hypothesized that the rate of molar translation was inversely correlated with bone mineral density ahead …
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Life extension of structural components via an improved nondestructive testing methodology
… analyzed exemplify the incorporation of digital technology into NDT and includes the following: meandering winding magnetometer array (MWM-array@) eddy current, phased-array ultrasonic (PA-UT), three dimensional computed tomography (3DCT), and digital radiography (DR). The three classes …
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Digital Microradiography: In Vitro Validation of a Novel Imaging Technique
Microradiography has been widely used in mineralized tissue research in determining the mineral content within the specimens being studied. There are considerable limitations of this ageing gold standard such as unavailability of the high-resolution spectroscopic plates and prolonged imaging and …
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Design und Erstellung einer graphischen Benutzerschnittstelle für medizinische Applikationen am Beispiel von Bildverarbeitungsalgorithmen zur digitalen Subtraktion von Röntgenbildern
Digital radiography opens new ways in diagnostic radiography, thus for example the digital subtraction of two radiographs. For the integration of such technologies into daily medical routine, not only fast computers are needed, but also suitable graphical user interfaces. The aim of the thesis is …
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Towards improving the Statscan X-ray image quality through sliding mode control of the C-arm
… methods for improving the image quality of a digital radiography system. The Lodox Statscan™ X-ray system provides a full-body scanned image for initial diagnosis. The system is driven by a permanent magnet linear motor (PMLM) controlled by a cascaded proportional-proportional integral …
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Interlandmark measurements from lodox statscan images with application to femoral neck anteversion assessment
… measurement tool for the Lodox Statscan digital radiography system. X-ray stereophotogrammetry was applied to Statscan images to enable three-dimensional point localization for inter-landmark measurement using two-dimensional radiographs. This technique requires images of the anatomical …
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Using X-ray Imaging Techniques to Determine Density of Foods
… Among these, computed tomography (CT) and digital radiography (DR) utilizing x-ray imaging showed greater capability for evaluation of food density. The x-ray attenuation through materials is dependent on the chemical composition and is proportional to density as described by the …
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A comparative study evaluating the performance of diagnostic radiography units and protocols for paediatric and adult chest radiography examinations
… radiation dose for paediatric and adult chest radiography (CXR), between and within hospitals. Large variations in IQ could influence the diagnostic accuracy, and variations in radiation dose could affect the risk to patients. This thesis aims to develop, validate and then use a novel method …
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Investigating the ability to use the CT scan projection radiograph to monitor adolescent idiopathic scoliosis
… SPR acquisitions and comparing it to those of digital radiography (DR) and a dedicated scoliosis imaging system (EOS) and by evaluating the accuracy of Cobb angle measurements on SPR images using a bespoke validated phantom. Methods: A dosimetry phantom representing a 10-year-old child and …
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