نتایج جستجو برای: uniformity correction

تعداد نتایج: 179312  

Journal: :Medical physics 2012
J Tan H Li P Parikh E Izaguirre D Yang

PURPOSE Longitudinal coverage of CBCT, which is 17 cm for head scan and 15.5 cm for body scan, is not enough to cover the entire PTV for over 90% of head/neck and gastrointestinal/genitourinary/gynecologic patients if lymph nodes are involved. Helical CBCT, which was accomplished using external beam LINAC in its research mode, is one promising way to extend the CBCT longitudinal coverage. Aim o...

Journal: :J. Comput. Physics 2017
Ulrich Römer Sebastian Schöps Herbert De Gersem

In electromagnetic simulations of magnets and machines one is often interested in a highly accurate and local evaluation of the magnetic field uniformity. Based on local post-processing of the solution, a defect correction scheme is proposed as an easy to realize alternative to higher order finite element or hybrid approaches. Radial basis functions (RBF)s are key for the generality of the meth...

Journal: :Journal of nuclear medicine : official publication, Society of Nuclear Medicine 1999
D Dey P J Slomka L J Hahn R Kloiber

UNLABELLED Coregistration of images from a single subject, acquired by different modalities, is important in clinical diagnosis, surgery and therapy planning. The purpose of this study was to evaluate, using a physical torso phantom, a novel, fully automated method for three-dimensional image registration of CT and SPECT, using radionuclide transmission (RNT) attenuation maps. METHODS We obta...

Journal: :International Journal of Advanced Computer Science and Applications 2017

Journal: :Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2007
Jianbin Xiao Tim C de Wit Wojciech Zbijewski Steven G Staelens Freek J Beekman

UNLABELLED (201)Tl-Chloride ((201)Tl) is a myocardial perfusion SPECT agent with excellent biochemical properties commonly used for assessing tissue viability. However, cardiac (201)Tl SPECT images are severely degraded by photons scattered in the thorax. Accurate correction for this scatter is complicated by the nonuniform density and varied sizes of thoraxes, by the additional attenuation and...

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