نتایج جستجو برای: phantom ct ct number
تعداد نتایج: 1305532 فیلتر نتایج به سال:
The field of Computerized Tomography (CT) has revolutionized medical imaging and has been applied to the diverse fields of radio astronomy, electron microscopy, geophysics, stress analysis, radar, and nondestructive testing. Computer simulation has played an integral role in the development of CT systems and algorithms. This article provides an overview of CT and the tools used to model and sim...
introduction patient set-up optimization is required in radiotherapy to fill the accuracy gap between personalized treatment planning and uncertainties in the irradiation set-up. in this study, we aimed to develop a new method based on neural network to estimate patient geometrical setup using 4-dimensional (4d) xcat anthropomorphic phantom. materials and methods to access 4d modeling of motion...
Image lag degrades image quality in cone-beam CT (CBCT), resulting in contrast reduction, lack of CT number accuracy and uniformity, and skin-line artifacts. The magnitude of such degradation and the extent to which imaging performance can be improved by means of a lag correction method were investigated. Measurements were performed using a radiotherapy CBCT guidance system (Elekta Synergy XVI,...
Development and comparison of spine-shaped phantoms generated by two different 3D-printing technologies, digital light processing (DLP) and Polyjet has been purposed to utilize in patient-specific quality assurance (QA) of stereotactic body radiation treatment. The developed 3D-printed spine QA phantom consisted of an acrylic body phantom and a 3D-printed spine shaped object. DLP and Polyjet 3D...
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