نتایج جستجو برای: hounsfield unit
تعداد نتایج: 395420 فیلتر نتایج به سال:
This study aimed to develop a prediction model for the operative time of flexible ureteroscopy (fURS) for renal stones. We retrospectively evaluated patients with renal stones who had been treated successfully and had stone-free status determined by non-contrast computed tomography (NCCT) 3 months after fURS and holmium laser lithotripsy between December 2009 and September 2014 at a single inst...
Accuracy in the treatment planning (TP) of proton therapy (PT) depends on precision information employed to calculate relative stopping power (RSP) tissues patient's body. This is obtained from x-ray computed tomography (xCT) images and calibration curve needed convert Hounsfield unit RSP values. Using xCT bears errors range estimation dose calculation TP. Proton (pCT) can decrease inherent unc...
Iterative reconstruction can optimize radiation dose and improve image quality on CT scan. This research method is quantitative analytic with the analysis of results head examination parameters associated to changes in variations 80 kV, 100 120 kV use iterative reconstruction. Image measurements are Hounsfield Unit (HU) value, standard deviation, Signal Noise Ratio (SNR) using Radiant Viewers. ...
ABSTRACT: 
 Aim:
 To determine the density and chemical structure of renal stones by using in vivo low dose helical computerized tomography.
 Methods:
 79 patients with or uretheral were included our study who going to have extracorporeal shock wave lithotripsy (ESWL) planned go through urinary stone surgery due stones. All densities measured Hounsfield Unit abdominal non-co...
OBJECTIVES This study was undertaken: (1) to evaluate the usefulness of unenhanced computed tomography (CT), magnetic resonance imaging (MRI) and CT guided biopsy for the characterization of adrenal masses in patients with operable non-small-cell lung cancer (NSCLC) and (2) to evaluate the situations in which CT guided biopsy is absolutely necessary before potentially curative resection of NSCL...
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