DICOM and Medical Imaging Data Formats Quiz

Answers and explanations appear as you take the quiz.

1. Which description best captures DICOM's role in imaging workflows?
   • A codec defining only how pixel arrays are compressed
   • A volume-array format that excludes acquisition context
   • A standard for storing and exchanging images with related attributes
   • A file extension that automatically certifies de-identification
2. Why should CT slices not be assembled solely by sorting filenames?
   • The alphabetic filename order defines patient coordinates in all cases
   • Spatial metadata determines their positions and orientation
   • Every directory contains exactly one correctly ordered series
   • Instance storage order always matches the patient's spatial axis
3. What does a NIfTI affine transform relate?
   • A study identifier to a series identifier
   • A compressed stream to its decoded byte count
   • Stored intensity values to their rescaled units
   • Voxel indices to spatial coordinates
4. Why can a DICOM-to-NIfTI conversion require more than copying pixels?
   • Geometry, scaling, timing and other context may change or be omitted
   • Copying pixel bytes guarantees identical physical orientation
   • The destination format necessarily preserves every source attribute
   • Conversion automatically removes all private information
5. Which attributes may be needed to interpret stored CT pixel values?
   • Only the number of files in the series
   • Only the order in which instances were downloaded
   • Modality-specific rescale parameters
   • Only the output image's chosen display window
6. What privacy check may still be needed after removing structured identifiers?
   • Assume that removing name fields guarantees anonymity
   • Check for identifiers burned into image pixels
   • Assume a successful format conversion proves privacy
   • Remove spatial transforms instead of inspecting identifiers
7. Why split imaging data by patient for many model evaluations?
   • To ensure each patient's anatomy appears in both training and test
   • To give every slice identical pixel dimensions
   • To avoid recording the patient's study grouping
   • To keep slices from one patient from leaking across partitions
8. What should a team verify after format conversion?
   • Dimensions, spacing, orientation and intensity interpretation
   • Only the output extension and file count
   • Only whether the converted image looks recognizable in one viewer
   • Only whether the compressed output has the expected size