Ultrashort echo time and zero echo time MRI at 7T
نویسندگان
چکیده
منابع مشابه
Optimized 3D ultrashort echo time pulmonary MRI.
PURPOSE To optimize 3D radial ultrashort echo time MRI for high resolution whole-lung imaging. METHODS 3D radial ultrashort echo time was implemented on a 3T scanner to investigate the effects of: (1) limited field-of-view excitation, (2) variable density readouts, and (3) radial oversampling. Improvements in noise performance and spatial resolution were assessed through simulation and phanto...
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Introduction: Ultrashort echo time (UTE) imaging offers advantages in being able to directly image tissues with T2 values less than a few milliseconds, such as tendons and cortical bone [1]. In the brain, short-T2 components are present in white matter [2] believed to be associated with myelin – as well as in connective tissues and calcifications, and these are known to be altered in neurodegen...
متن کاملMRI with zero echo time: hard versus sweep pulse excitation.
Zero echo time can be obtained in MRI by performing radiofrequency (RF) excitation as well as acquisition in the presence of a constant gradient applied for purely frequency-encoded, radial centre-out k-space encoding. In this approach, the spatially nonselective excitation must uniformly cover the full frequency bandwidth spanned by the readout gradient. This can be accomplished either by shor...
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UNLABELLED One of the challenges in PET/MRI is the derivation of an attenuation map to correct the PET image for attenuation. Different methods have been suggested for deriving the attenuation map from an MR image. Because the low signal intensity of cortical bone on images acquired with conventional MRI sequences makes it difficult to detect this tissue type, these methods rely on some sort of...
متن کاملPreliminary use of a double-echo pulse sequence with 3D ultrashort echo time in the MRI of bones and joints
The aim of the present study was to investigate the application of a double-echo pulse sequence with 3D ultrashort echo time (UTE) in the magnetic resonance imaging (MRI) of bones and joints. In total, 7 healthy volunteers and 1 volunteer with a suspected tear of the lateral meniscus of the left knee joint underwent MRI with a double-echo pulse sequence and 3D UTE. The imaging was performed on ...
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ژورنال
عنوان ژورنال: Magnetic Resonance Materials in Physics, Biology and Medicine
سال: 2015
ISSN: 0968-5243,1352-8661
DOI: 10.1007/s10334-015-0509-0