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In practice, k-space often refers to the temporary image space, usually a matrix, in which data from digitized MR signals are stored during data acquisition. When k-space is full (at the end of the scan) the data are mathematically processed to produce a final image. Thus k-space holds raw data before reconstruction.
Investigation of more advanced strategies for recovering data in this k-space region is also a topic of ongoing research. [16] Thresholded k-space division [12] [17] only requires a single angle acquisition, and benefits from the ease of implementation as well as the fast calculation speed. However, streaking artifacts are frequently present in ...
Echo-planar imaging is an MRI technique that reduces the time of data acquisition to reduce capture of patient movement. An image in the EPI can be captured in between 20-100 milliseconds. Multiple lines of data are created by transmitting RF pulse sequences with a gradient difference of 90° and 180°.
Then, the filled-in k-space data undergoes the inverse Fourier transform to construct the partial, non-aliased images. These images are then simply combined directly in the spatial domain. [25] If the k-space data is non-Cartesian, reconstruction is computationally more difficult, since the fast Fourier transform (FFT) requires Cartesian values ...
Magnetic Resonance Fingerprinting (MRF) unlike MRI, dynamically varies acquisition parameters throughout the process. Unlike traditional methods that repetitively use the same parameters until full k-space data are acquired, MRF's flexible approach involves adjusting radiofrequency excitation angle (FA), phase, repetition time, and k-space ...
Analyze is a software package developed by the Biomedical Imaging Resource (BIR) at Mayo Clinic for multi-dimensional display, processing, and measurement of multi-modality biomedical images. It is a commercial program and is used for medical tomographic scans from magnetic resonance imaging , computed tomography and positron emission tomography .
Since the data at the center of k-space represent lower spatial frequencies than the data at the edges of k-space, the T E value for the center of k-space determines the image's T 2 contrast. The importance of the center of k-space in determining image contrast can be exploited in more advanced imaging techniques. One such technique is spiral ...
FreeSurfer interoperates easily with the FMRIB Software Library (FSL), a comprehensive library for image analysis written by the Functional MRI of the Brain (FMRIB) group at Oxford, UK. The functional activation results obtained using either the FreeSurfer Functional Analysis Stream (FS-FAST) or the FSL tools can be overlaid onto inflated ...