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. Which CT post-processing technique displays only voxels above a selected threshold, making it useful for 3D visualization of bones and vascular structures?

    Answer: Maximum intensity projection (MIP)

    Maximum intensity projection (MIP) selects and displays the highest attenuation voxel along each ray through the dataset, ideal for visualizing contrast-enhanced vessels or calcifications.

  2. Multiplanar reformation (MPR) in CT refers to:

    Answer: Reconstructing axial images into coronal, sagittal, or oblique planes

    MPR uses the volumetric CT dataset to create reformatted images in any anatomical plane without additional radiation exposure to the patient.

  3. In CT, the filtered back projection (FBP) reconstruction algorithm applies a mathematical filter primarily to:

    Answer: Correct for star artifacts inherent in simple back projection

    FBP applies a ramp or other convolution filter to projection data before back-projecting to eliminate the blurring ('star artifact') produced by simple back projection.

  4. Iterative reconstruction (IR) techniques in CT offer which primary advantage over filtered back projection?

    Answer: Reduced image noise at the same or lower radiation dose

    IR algorithms use repeated mathematical modeling of the imaging process to suppress noise, allowing diagnostic image quality to be maintained at reduced mAs and dose.

  5. Curved planar reformation (CPR) in CT is most useful for:

    Answer: Straightening and displaying tortuous structures such as vessels or the spine along their entire length

    CPR follows a user-defined curved path through the volume dataset to display a tortuous structure in a single unfolded plane, useful for coronary arteries or the aorta.

  6. Which post-processing technique is most appropriate for evaluating luminal stenosis of the carotid arteries on a CT angiogram?

    Answer: Multiplanar reformation combined with MIP

    Combining MPR (which shows vessel walls and plaques in cross-section) with MIP (which shows the lumen in projection) gives the most complete assessment of carotid stenosis.