Results 231 to 240 of about 7,900,465 (264)
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Effect of contrast agent administration on water equivalent diameter in CT
Medical Physics, 2021PurposeWater equivalent diameter (WED) is the preferred surrogate for patient size in computed tomography (CT). It is better than geometric size surrogates and patient weight/height/BMI/age because it correlates the best with x‐ray attenuation. The administration of oral/IV contrast agents increases a patient’s attenuation and should therefore increase
Benjamin, Viggiano +2 more
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Physica Medica, 2023
This study aimed to compare the average Water Equivalent Diameter (WED) values obtained from CTContour, an open-source program for Size-Specific Dose Estimate (SSDE) and WED calculation, and vendor-specific values provided by Philips scanners.A random sample of 50 adult and 50 paediatric abdomen-pelvis protocol CT images from Philips scanners were ...
Mohamed Khaldoun Badawy, Shay Payne
exaly +3 more sources
This study aimed to compare the average Water Equivalent Diameter (WED) values obtained from CTContour, an open-source program for Size-Specific Dose Estimate (SSDE) and WED calculation, and vendor-specific values provided by Philips scanners.A random sample of 50 adult and 50 paediatric abdomen-pelvis protocol CT images from Philips scanners were ...
Mohamed Khaldoun Badawy, Shay Payne
exaly +3 more sources
International Journal of Scientific Research in Science and TechnologyThis study aims to determine relationship between water-equivalent diameter (Dw) and low-contract detectability (LCD) for various reconstruction filters. The water phantoms were Hitachi phantoms with diameters of 16, 22.5, 30, and 38 cm. The phantoms were scanned with a 64-slice Hitachi CT Scanner and reconstructed with various reconstruction filters ...
Heri Sutanto, Choirul Anam
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Assessment of Organ Doses for CT Patients Based on x-Ray Attenuation Using Water Equivalent Diameter
Radiation Physics and Chemistry, 2021Abstract Organ doses for patients having CT scans can be assessed using Monte Carlo simulations, but this would require significant computing power if carried out for every patient. An alternative method is to use scanner-independent dose conversion coefficients (DCCs) to estimate organ doses.
Colin John Martin, Abdullah Abuhaimed
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Analysis and Prediction of Equivalent Diameter of Air Bubbles Rising in Water
CFD LettersThe equivalent diameter of rising bubbles in liquids is an important parameter that has been investigated for decades by researchers for different purposes. Bubble diameter plays important role in quantifying oil and gas leaks in subsea leak analysis, since it allows the prediction of the magnitude of leaks in seabed petroleum wells and other ...
Gabriel de Carvalho Nascimento
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Equivalent Diameter of a Prefabricated Vertical Drain
Geotextiles and Geomembranes, 2009 The aim of this study is to evaluate numerically the equivalent diameter of a prefabricated vertical drain (PVD) using an equal flow rate approach. This approach requires that the equivalent circular well to be able to yield similar discharge as a PVD ...
Hossam M Abuel-naga, Abdelmalek Bouazza
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International Journal of Scientific Research in Science and TechnologyThis study aims to investigate the step-wedge phantom for calibrating CT localizer radiograph for different tube voltages. The in-house step-wedge phantom has five steps with thicknesses of 6, 12, 18, 24, and 30 cm. The phantom was scanned using a 64-slice Siemens Definition AS CT scanner at tube voltages of 80, 100, 120, 140, and 160 kVp.
Heri Sutanto +2 more
exaly +2 more sources
Estimating Patient Water Equivalent Diameter From CT Localizer Images – A Longitudinal and Multi-Institutional Study of the Stability of Calibration Parameters [PDF]
Medical Physics, 2020 PurposeWater equivalent diameter (WED) is a robust patient‐size descriptor. Localizer‐based WED estimation is less sensitive to truncation errors resulting from limited field of view, and produces WED estimates at different locations within one localizer radiograph, prior to the initiation of axial scans.
Da Zhang, Xinming Liu, Xinhui Duan
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Accuracy of Effective Diameter and Water Equivalent Diameter Using Phantoms in Various CT Systems
Japanese Journal of Radiological TechnologyThe effects of scanning parameters such as CT system performance, CT bed geometry, and upper limb position on effective diameter (ED) and water equivalent diameter (WED) have not been assessed. The purpose of this study was to compare both ED and WED obtained with various CT systems with theoretical values and to assess their accuracy.Jaszczak ...
Hajime Ichikawa +6 more
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