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 6 of 6 for “"CTDI"”.
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CONE BEAM COMPUTED TOMOGRAPHY (CBCT) DOSIMETRY: MEASUREMENTS AND MONTE CARLO SIMULATIONS
… for CBCT. Computed tomography dose index (CTDI), a standardized metric in conventional CT dosimetry, or direct organ dose measurements have been limitedly used in the CBCT dosimetry.</p> <p>This dissertation investigated the CBCT dosimetry from the CTDI method to the organ, effective dose, …
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Image quality and dose of an accelerator-integrated kV CBCT systems
… was also estimated using standard CT dose index (CTDI) phantoms and several imaging protocols. Overall, the image quality between the OBI and XVI was fairly consistent with each other with the exception of high contrast resolution and Hounsfield Unit (HU) accuracy. CTDI of OBI was higher than that …
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Cone Beam Computed Tomography - radiation dose and image quality assessments
… easy-to-use methods. Two methods: CT dose index (CTDI), prevailing method for CT units, and dose-area product (DAP) were evaluated for calculating effective dose (E) for both units. An asymmetric dose distribution was revealed when a clinical situation was simulated. Hence, the CTDI method was not …
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Efecto de la renovación tecnológica en la dosis de radiación y en la calidad de las imágenes de tomografía computarizada
… posible en el paciente. A pesar de que el CTDI y el DLP son las magnitudes asociadas a la dosis con las que se establecen los DRL, esas magnitudes dosimétricas son independientes del tamaño del paciente, razón por la cual la AAPM introduce el parámetro SSDE que aún no es utilizado como …
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Characterization of Low Density Intracranial Lesions Using Dual-Energy Computed to mography
… ability was shown to improve with increasing CTDI<sub>vol</sub>, image thickness and lesion size. Using an optimized protocol, intracranial lesions were correctly classified with over 90% confidence down to a minimum attenuation of 56 HU, representing a significant improvement beyond the 100 …
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In-Vivo Ct Dosimetry During Virtual Colonoscopy
<p>Virtual colonoscopy (VC) is a minimally invasive means for identifying colorectal polyps and colorectal lesions by insufflating a patient’s bowel, applying contrast agent via rectal catheter, and performing multi-detector computed tomography (MDCT) scans. The technique is recommended for colonic …