منابع مشابه
Energy window setting for optimum Tl-201 cardiac imaging [Persian]
Introduction: Poor sensitivity and poor signal to noise ratio because of low injected thallium dose and presence of scattered photons are the main problems in using thallium in scintigraphic imaging of the heart. Scattered photons are the main cause of degrading the contrast and resolution in SPECT imaging that result in error in quantification. Thallium decay is ve...
متن کاملMR imaging of mucoceles of the sphenoid sinus.
Mucocele of the sphenoid sinus is a rare disorder [1-3]. Its clinical manifestations are varied, primarily reflecting the intimate anatomic relationships between the sphenoid sinus and cranial nerves 11-VI, the cavernous sinus, internal carotid arteries, pituitary gland, and optic chiasm [2, 4-8]. Two patients presenting with cranial nerve deficits were evaluated with CT and MR imaging. CT show...
متن کاملMucoceles of the paranasal sinuses: MR imaging with CT correlation.
The MR findings in six cases of paranasal sinus mucoceles are described. Two basic MR appearances were encountered: either moderate to marked signal hypointensity in the expanded sinuses on T1- and T2-weighted images (four patients) or moderate to marked signal hyperintensity on T1- and T2-weighted images (two patients). These patterns appear to represent inspissated or hydrated sinus contents,...
متن کاملenergy window setting for optimum tl-201 cardiac imaging [persian]
introduction: poor sensitivity and poor signal to noise ratio because of low injected thallium dose and presence of scattered photons are the main problems in using thallium in scintigraphic imaging of the heart. scattered photons are the main cause of degrading the contrast and resolution in spect imaging that result in error in quantification. thallium decay is very complicated and photons ar...
متن کاملDetermination of the optimum filter for qualitative and quantitative 99mTc myocardial SPECT imaging
Background: Butterworth, Gaussian, Hamming, Hanning, and Parzen are commonly used SPECT filters during filtered back-projection (FBP) reconstruction, which greatly affect the quality and size accuracy of image. Materials and Methods: This study involved a cardiac phantom in which 1.10 cm thick cold defect was inserted into its myocardium wall and filled with 4.0 μCi/ml (0.148 MBq/ml) 99mTc conc...
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ژورنال
عنوان ژورنال: The Journal of Laryngology & Otology
سال: 2000
ISSN: 0022-2151,1748-5460
DOI: 10.1258/0022215001905238