نتایج جستجو برای: echo time
تعداد نتایج: 1912899 فیلتر نتایج به سال:
We present a method to project time-bin qutrits stored in an echo-based quantum memory using several successive partial readouts of the memory. demonstrate how this scheme can be used implement projections onto full set mutually unbiased bases and, therefore, enables characterization arbitrary states. Further, we study integration protocol for case atomic frequency comb spin-wave storage by sim...
BACKGROUND AND PURPOSE A challenge with the T1-weighted postcontrast Cartesian spin-echo and turbo spin-echo brain MR imaging is the presence of flow artifacts. Our aim was to develop a rapid 2D spiral spin-echo sequence for T1-weighted MR imaging with minimal flow artifacts and to compare it with a conventional Cartesian 2D turbo spin-echo sequence. MATERIALS AND METHODS T1-weighted brain im...
STUDY OBJECTIVES To evaluate the time-related change of left atrial (LA) appendage flow velocity in chronic atrial fibrillation (AF) by follow-up transesophageal echocardiography (TEE) and to investigate its association with the occurrence of LA spontaneous echo contrast. DESIGN Prospective follow-up study. SETTING University-based, tertiary referral medical center. PATIENTS Forty-seven p...
BACKGROUND AND PURPOSE Age-related iron accumulation in extrapyramidal nuclei causes T2 shortening, which may result in decreased signal intensity in these areas on MR images. Because the dynamic susceptibility contrast-enhanced technique uses heavily T2*- or T2-weighted images, the iron-induced susceptibility may have direct impact on perfusion imaging. The purpose of this study was to assess ...
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