CMI CMI Digital Media & Interactive Visualization 2 — Questions and Answers
Question 1: In creating an interactive e-learning module for medical education, which accessibility standard should guide multimedia design?
- ISO 9001
- WCAG 2.1 AA (Correct answer)
- DICOM standard
- HL7 FHIR
Correct answer: WCAG 2.1 AA
WCAG 2.1 Level AA is the widely adopted accessibility standard for web-based educational content, covering visual, auditory, and cognitive accessibility requirements.
Question 2: Which compression format is preferred for high-quality medical illustration video with broad platform compatibility?
- AVI (uncompressed)
- H.264/MP4 (Correct answer)
- DV codec
- Cinepak
Correct answer: H.264/MP4
H.264 encoded in an MP4 container offers an optimal balance of visual quality, file size, and compatibility across browsers, mobile, and presentation platforms.
Question 3: In Photoshop for medical illustration, which blending mode is most useful for building up transparent tissue layers?
- Dissolve
- Multiply (Correct answer)
- Hard Light
- Luminosity
Correct answer: Multiply
Multiply blending mode darkens underlying layers by multiplying pixel values, making it ideal for layering transparent tissue and shadow effects in medical illustration.
Question 4: What is 'Z-fighting' in 3D medical visualization and how is it corrected?
- Camera clipping artifacts corrected by adjusting the far plane
- Coplanar surface flickering corrected by offsetting geometry or adjusting depth bias (Correct answer)
- Shadow rendering errors fixed by increasing shadow map resolution
- Normal map errors fixed by recalculating face normals
Correct answer: Coplanar surface flickering corrected by offsetting geometry or adjusting depth bias
Z-fighting occurs when two surfaces share nearly identical depth values, causing flickering; it is corrected by slightly offsetting one surface or adjusting the depth bias.
Question 5: In medical illustration for mobile apps, which image format best supports transparency with smaller file sizes than PNG for complex illustrations?
- JPEG
- BMP
- WebP (Correct answer)
- GIF
Correct answer: WebP
WebP supports alpha transparency and achieves significantly smaller file sizes than PNG while maintaining comparable image quality, making it preferred for mobile medical apps.
Question 6: Which technique in 3D anatomy software segments CT scan data into distinct tissue structures for visualization?
- Ray casting
- Threshold-based segmentation with region growing (Correct answer)
- Wireframe modeling
- UV unwrapping
Correct answer: Threshold-based segmentation with region growing
Threshold segmentation assigns intensity ranges (Hounsfield units) to tissue types (bone, soft tissue, air), while region growing refines boundaries to isolate structures.
CMI CMI Digital Media & Interactive Visualization 2
In creating an interactive e-learning module for medical education, which accessibility standard should guide multimedia design?