نتایج جستجو برای: scatter dose
تعداد نتایج: 321996 فیلتر نتایج به سال:
The use of mobile head computed tomography (CT) equipment in intensive care is of benefit to unstable patients with brain injury. However, ionising radiation in a ward environment presents difficulties due to the necessity to restrict the exposure to staff and members of the public according to regulation 8(1-2) of the Ionising Radiation Regulations 1999. The methodology for enabling the use of...
camera, and x-ray tube (partially hidden below table), attached to a floor-mounted parallelogram gantry to allow complex angulation; (2) lateral plane image chain attached to a ceiling-suspended gantry that can be moved into place when biplane imaging is desired; (3) and (4) television monitors for AP and lateral image chains; (5) movable radiation shield to protect operators from scatter dose ...
Evaluation of the potential hazard of man-made nanomaterials has been hampered by a limited ability to observe and measure nanoparticles in cells. In this study, different concentrations of TiO(2) nanoparticles were suspended in cell culture medium. The suspension was then sonicated and characterized by dynamic light scattering and microscopy. Cultured human-derived retinal pigment epithelial c...
This study examined the effectiveness of guidance teachers on students’ achievement among Shahed and Isargar guidance school student in scatter plot in West Azerbaijan province in. This research method is causal-comparative. The study population consisted of all 270 Shahed and Isargar students in scatter plot in West Azerbaijan province and all 305 Shahed and Isargar students studying in guidan...
BACKGROUND Breast cancers are more frequently diagnosed at an early stage and currently have improved long term outcomes. Late normal tissue complications induced by adjuvant radiotherapy like secondary cancers or cardiomyopathy must now be avoided at all cost. Several new breast radiotherapy techniques have been developed and this work aims at comparing the scatter doses of internal organs for...
introduction: image quality and accuracy of in vivo activity quantification in spect are affected by collimator penetration and scatter components, especially in high energy imaging. these phenomena highly depend on the collimator characteristic and photon energy. the presence of penetrated and scattered photons from collimator in spect images degrades spatial resolution, contrast and image qua...
Quantitative tissue classification using dual-energy CT has the potential to improve accuracy in radiation therapy dose planning as it provides more information about material composition of scanned objects than the currently used methods based on single-energy CT. One problem that hinders successful application of both singleand dualenergy CT is the presence of beam hardening and scatter artif...
The purpose of this work was to evaluate the potential of a new transmission detector for real-time quality assurance of dynamic-MLC-based radiotherapy. The accuracy of detecting dose variation and static/dynamic MLC position deviations was measured, as well as the impact of the device on the radiation field (surface dose, transmission). Measured dose variations agreed with the known variations...
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