نتایج جستجو برای: rando
تعداد نتایج: 268 فیلتر نتایج به سال:
Prevention of radiographic-contrast-agent-induced reductions in renal function by acetyl-cysteine. N-acetylcysteine and contrast-induced nephropathy: a metaana-lysis of 13 randomized trials. A et al. Standard vs double dose of N-acetylcysteine to prevent contrast agent associated nephrotoxicity. Ascorbic acid prevents contrast-mediated nephropathy in patient with renal dysfunction undergoing co...
BACKGROUND Marketing new radiography devices necessitates documenting their absorbed X-ray doses. Since the current literature lacks studies on new devices, we assessed the doses of two new devices that had not previously been assessed. OBJECTIVES The new devices were compared to the Promax three dimensional (3D) scanner at two fields of view (FOV) in nine critical head and neck tissues and o...
Chest wall radiation therapy treatment delivery was monitored using a 5 mm thick radiochromic poly(vinyl alcohol) cryogel that also provided buildup material. The cryogels were used to detect positioning errors and measure the impact of shifts for a chest wall treatment that was delivered to a RANDO phantom. The phantom was shifted by ± 2, ± 3, and ± 5 mm from the planned position in the anteri...
The binding of aminoglycosides to RNA provides a paradigm system for the analysis of RNA-drug interactions. The electrostatic field around three-dimensional RNA folds creates localized and defined negatively charged regions which are potential docking sites for the cationic ammonium groups of aminoglycosides. To explore in RNA folds the electronegative pockets suitable for aminoglycoside bindin...
Junctions of fields are known to be susceptible to developing cold or hot spots in the presence of even small geometrical misalignments. Reduction of these dose inhomogeneities can be accomplished through decreasing the dose gradients in the penumbra, but currently it cannot be done for enhanced dynamic wedges (EDW). An MLC-based penumbra softener was developed in the developer mode of TrueBeam...
M. Ackermann, A. Albert, B. Anderson, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, E. Bissaldi, E. D. Bloom, E. Bonamente, A. Bouvier, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, M. Caragiulo, P. A. Caraveo, C. Cecchi, E. Charles, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad,...
OBJECTIVE The aim of this study was to compare the image quality and radiation dose in chest imaging using an amorphous silicon flat-panel detector system and an amorphous selenium flat-panel detector system. In addition, the low-contrast performance of both systems with standard and low radiation doses was compared. MATERIALS AND METHODS In two groups of 100 patients each, digital chest radi...
There is a growing interest in patient exposure resulting from an x-ray imaging procedure used in image-guided radiation therapy. This study explores a feasibility to use a commercially available optically stimulated luminescence (OSL) dosimeter, nanoDot, for estimating imaging radiation exposure to patients. The kilovoltage x-ray sources used for kV-cone-beam CT (CBCT) imaging acquisition proc...
This paper reports on the commissioning of an Elekta cone-beam computed tomography (CT) system at one of the first U.S. sites to install a "regular," off-the-shelf Elekta Synergy (Elekta, Stockholm, Sweden) accelerator system. We present the quality assurance (QA) procedure as a guide for other users. The commissioning had six elements: (1) system safety, (2) geometric accuracy (agreement of me...
Search for gamma-ray spectral lines with the Fermi Large Area Telescope and dark matter implications
M. Ackermann, M. Ajello, A. Albert,* A. Allafort, L. Baldini, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, E. Bissaldi, E. D. Bloom, E. Bonamente, E. Bottacini, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G.A. Caliandro, R. A. Cameron, P. A. Caraveo, J.M. Casandjian, C. Cecchi, E. Charles, R. C. G. Chaves, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Co...
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