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MRI Sequences and Protocols Flashcards

6 cards from real MRI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 MRI Sequences and Protocols flashcards as text

  1. What does k-space represent in MRI?

    Answer: The raw data space containing spatial frequency information from which the MR image is reconstructed by Fourier transform

    K-space is the mathematical data domain where raw MRI signal is stored as spatial frequencies; a Fourier transform converts k-space data into the final diagnostic image.

  2. Which MRI technique encodes functional brain activity by detecting changes in blood oxygenation level?

    Answer: Blood oxygen level-dependent (BOLD) fMRI

    BOLD fMRI detects regional neural activity via the magnetic susceptibility difference between oxyhemoglobin and deoxyhemoglobin, providing maps of brain activation.

  3. MR spectroscopy (MRS) of the brain identifies metabolites by their distinct chemical shifts. Which metabolite is elevated in tumors with high cell density and membrane turnover?

    Answer: Choline (Cho)

    Choline is a marker of membrane synthesis and cellular turnover; elevated choline is characteristic of tumors, demyelination, and other high-proliferation states.

  4. Parallel imaging techniques such as GRAPPA and SENSE reduce scan time by:

    Answer: Using multiple receiver coil elements to partially fill k-space and reduce phase encoding steps

    Parallel imaging exploits spatial sensitivity information from multiple coil elements to skip phase encoding lines, reconstructing the full image and reducing acquisition time.

  5. Diffusion tensor imaging (DTI) and tractography are primarily used to evaluate which brain structure?

    Answer: White matter fiber tracts and connectivity

    DTI measures the directional diffusion of water in white matter to map axonal fiber tracts, enabling tractography of major pathways such as the corticospinal tract.

  6. Which parameter in MRI controls the field of view (FOV) and therefore directly affects spatial resolution when matrix size is held constant?

    Answer: FOV size relative to matrix (voxel size = FOV/matrix)

    Voxel size = FOV divided by matrix; decreasing FOV while maintaining matrix size decreases voxel size, increasing spatial resolution but reducing SNR.