acquisition matrix

acquisition matrix

An MRI term for the total number of independent data samples in the frequency and phase directions.
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Examination protocol comprised following sequences: 1) Axial turbo spin-echo fat saturated T2-weighted sequence (TR/TE, 4100/70 ms; field of view, 30 cm; acquisition matrix, 440x380; slice thickness, 3 mm; and acquisition time, 3 min 43 s).
Sagittal proton-density fat-suppressed turbo spin-echo (TSE) (TR/TE: 1,500/15, acquisition matrix: 256x38 4, 18 cm field of view), coronal proton-densit y fat-suppressed TSE (TR/TE: 1,500/15, acquisition matrix: 256 x 320, 18 cm field of view), coronal [T.sub.1]-weighted TSE (TR/TE: 500/18, acquisition matrix: 256x320, 21 cm field of view, two excitations), and axial [T.sub.2]-weighted fat-suppressed TSE (TR/TE: 2000/60, acquisition matrix: 256 x 288, 16 cm field of view, two excitations) sequences were included into the scan as the standard sequences.
The sagittal T2-WI parameters were as follows: repetition time (TR)/echo time (TE), 6181/130 ms; slice thickness/gap, 4 mm/0.4 mm; field of view (FOV), 240 mm; acquisition matrix, 320 x 320; echo train length (ETL), 24; bandwidth, 62.5 kHz; and no fat saturation.
Subsequently, axial DWI with 9 b values (0, 50, 100, 150, 200, 300, 400, 600, and 800 s/mm [sup]2 ) were obtained using a single-shot echo planar imaging sequence and motion-probing gradients in three orthogonalaxes (TR/TE, 4000/59.3-63.1; slice thickness/gap, 3 mm/1 mm; FOV, 340 mm; acquisition matrix, 160 x 192; and receiver bandwidth, 250 kHz).
Fifty contiguous DT-MR images were obtained at 1.5 T Philips Gyroscan MR scanner with the following imaging parameters: field of view = 224 x 224 [mm.sup.2], slice thickness = 3 mm, acquisition matrix = 96, reconstruction matrix = 128, TR = 10,000 ms, TE = 76 ms, b factor = 1000 s/[mm.sup.2], the number of diffusion sensitizing gradients = 6.
An axial 2D spin-echo (SE) T2-weighted Fluid Attenuated Inversion Recovery (FLAIR) image: echo time (TE)/repetition time (TR)/inversion time (TI) = 140/11000/2800 ms, flip angle (FA) = 90[degrees], echo train length (ETL) = 50, acquisition matrix = 256 x 188, FOV = 250 [mm.sup.2] (for an in-plane resolution of 0.9 mm x 1.3 mm), slice thickness = 5 mm, gap = 1mm, number of excitations (NEX) = 2, and number of slices = 24.
An axial 2D SE T1-weighted image: TE/TR = 15/649.5 ms, FA = 90[degrees], ETL = 1, acquisition matrix = 260 x 209, FOV = 250 [mm.sup.2] (in-plane resolution of 0.9 mm x 1.2 mm), slice thickness = 5 mm, gap = 1 mm, NEX = 2, and number of slices = 24.
An axial 3D perfusion weighted gradient echo (GRE) sequence (Principles of Echo Shifting with a Train of Observations, PRESTO) for Dynamic Susceptibility Contrast MRI: TE/TR = 8/16.72 ms (effective T2 = 23.71 ms), FA = 7[degrees], ETL = 7, acquisition matrix = 64 x 64, FOV = 220 [mm.sup.2] (in-plane resolution of 3.44 mm x 3.44 mm), slice thickness = 3 mm, NEX = 1, and number of slices = 30 with 40 temporal localizations.
Such independence does not imply a lack of support for the rest of the acquisition matrix. On the contrary, the best support that can be given by the contracting staff is the competent exercise of contracting skills involving sound business judgment.

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