MRI Technologist

MRI Enterography: Indications, Patient Preparation, Technique & Patient Positioning, MR Sequences and protocol

MRI Enterography: Indications, Patient Preparation, Technique & Patient Positioning, MR Sequences and protocol MR Sequences and protocol Coronal and Axial T2-w single-shot fast spin echo (SS-FSE/HASTE) without fat suppression. Coronal and Axial FIESTA/True-FISP without fat suppression. Coronal and/or Axial T2-w single-shot fast spin echo (SS-FSE/HASTE) with fat suppression. Non-enhanced Axial T1-w GRE with fat suppression. …

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Fat suppression techniques

Fat suppression techniques take of two (2) characteristics. First, the difference in precession frequency between water and fat, which is utilized in chemical/spectral (pre)saturation, Dixon/IDEAL and water excitation techniques. Second, the difference in T1 relaxation times between water and fat, which is utilized by STIR sequence. Finally, there are hybrid techniques, which combine the two …

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Gadoxetate Disodium–Enhanced MRI of the Liver on a patient with hemangioma

Gadoxetate Disodium–Enhanced MRI of the Liver on a patient with hemangioma

Gadoxetate Disodium–Enhanced MRI of the Liver on a patient with hemangioma. Hemangiomas normally have a typical presentation at MRI with extracellular contrast and are not an indication for investigation with hepatobiliary contrast (Gadoxetate Disodium). At conventional MRI, hemangiomas present marked hypersignal on T2-weighted, hyposignal on T1-weighted sequences, discontinuous, nodular, peripheral contrast enhancement in the arterial …

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Multiparametric (anatomical & functional) MR Imaging of the facial skull and neck

Multiparametric (anatomical & functional) MR Imaging of the facial skull and neck on a patient with squamous cell carcinoma. Facial and neck are very heterogeneous regions, containing a variety of tissues that include fat, muscle, air, glandular tissue and bone. For this reason, chemical/spectral saturation and hybrid fat saturation techniques (SPAIR, SPIR, SPECIAL) suffer from …

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Diffusion Tensor Imaging (DTI) of Brachial Plexus

Diffusion Tensor Imaging (DTI) of Brachial Plexus

Diffusion is the random, thermally-induced, microscopic water motion within a tissue, well known as Brownian motion. Diffusion Tensor Imaging (DTI) is an extension of Diffusion-Weighted Imaging (DWI) that takes into account and measures the anisotropic diffusion (nerves are highly anisotropic). DTI can be useful in MR Neurography of the brachial plexus, offering functional information (can …

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