Practice Test Geeks(ARRT) American Registry of Radiologic Technologists Computed Tomography Certification Practice Test
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ARRT CT Post-Processing and Reconstruction Flashcards

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

Read the first 6 ARRT CT Post-Processing and Reconstruction flashcards as text

  1. Minimum intensity projection (MinIP) post-processing is particularly useful for displaying which anatomical structures?

    Answer: Air-filled airways and lung parenchyma

    MinIP projects the lowest attenuation voxel along each ray, making it ideal for displaying air-containing structures like the tracheobronchial tree or emphysematous lung.

  2. CT colonoscopy (virtual colonoscopy) relies on which post-processing technique to create a simulated fly-through view of the colon lumen?

    Answer: Volume rendering with endoluminal navigation

    Volume rendering with endoluminal navigation uses the air-distended colon as a flight path, generating a simulated colonoscopic perspective of the mucosal surface.

  3. What is the primary purpose of selecting a small reconstruction FOV (field of view) during CT image reconstruction?

    Answer: To improve spatial resolution by sampling more detail per pixel

    A smaller reconstruction FOV divides the imaged area into the same matrix of pixels, resulting in smaller pixel size and therefore higher spatial resolution of the region of interest.

  4. CT perfusion imaging requires specialized post-processing to generate which type of parametric maps?

    Answer: Cerebral blood flow, cerebral blood volume, and mean transit time maps

    CT perfusion post-processing applies deconvolution or maximum slope models to time-attenuation curves to produce quantitative maps of CBF, CBV, and MTT.

  5. In CT angiography post-processing, bone subtraction is performed primarily to:

    Answer: Eliminate overlying bone to improve visualization of adjacent vessels

    Bone subtraction algorithms register and subtract non-contrast images from contrast-enhanced images, removing osseous structures that would otherwise obscure adjacent vessels.

  6. Which statement best describes an isotropic voxel in CT imaging?

    Answer: A voxel with equal dimensions in x, y, and z axes

    Isotropic voxels have equal measurements in all three spatial dimensions, enabling high-quality MPR and 3D reconstructions in any plane without stair-step degradation.