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Image MIME Reference
DICOM-RLE

DICOM Run-Length Encoding

image/dicom-rle
VS

Drawing Exchange Format

image/vnd.dxf
DXF

A complete technical comparison of DICOM Run-Length Encoding and Drawing Exchange Format — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature DICOM-RLE DXF
Transparency (Alpha) ✕ No Yes
Animation Support Yes ✕ No
Progressive Loading ✕ No ✕ No
HDR Support Yes ✕ No
EXIF Metadata ✕ No ✕ No
ICC Color Profile Yes ✕ No
DICOM Run-Length Encoding
image/dicom-rle
Extension
.dcm.dicom
Container DICOM (PS3.10)
Compression Lossless (RLE)
Algorithm
Run-Length Encoding (RLE)
Color Depth 8-bit, 16-bit, 24-bit
Developed by National Electrical Manufacturers Association (NEMA) / ACR
Released 1993
Magic Bytes
44 49 43 4D (at byte offset 128)
Full DICOM-RLE reference →
Drawing Exchange Format
image/vnd.dxf
Extension
.dxf
Container Text / Binary Container
Compression Uncompressed (ASCII) / Uncompressed (Binary)
Algorithm
None
Color Depth Vector (Indexed AutoCAD Colors / True Color)
Developed by Autodesk
Released 1982
Magic Bytes
30 0D 0A 53 45 43 54 49 4F 4E (ASCII) / 41 75 74 6F 43 41 44 20 42 69 6E 61 72 79 20 44 58 46 0D 0A 1A 00 (Binary)
Full DXF reference →

Browser Support Comparison

Browser DICOM-RLE DXF
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
DICOM-RLE

DICOM-RLE Strengths

  • Guarantees lossless preservation of critical medical data necessary for diagnostics
  • Extremely robust metadata structure containing patient information, modality, and spatial geometry
  • Faster to encode and decode than complex compression schemes like JPEG 2000
Limitations
  • RLE compression offers very low compression ratios compared to modern codecs like JPEG-LS or JPEG 2000
  • Zero support in web browsers or standard consumer image viewers
  • Strict data privacy regulations (HIPAA/GDPR) make handling DICOM files complex due to embedded PHI
DXF

DXF Strengths

  • Universally supported by almost every CAD program, 3D modeler, and vector graphics editor in existence
  • ASCII structure is human-readable and can be parsed or generated programmatically with relative ease
  • The de facto standard for sending 2D cutting paths to CNC routers, plasma cutters, and laser engravers
Limitations
  • ASCII DXF files can be enormously large and inefficient compared to binary DWG files
  • The format relies heavily on legacy AutoCAD data structures, making complex 3D entity parsing extremely difficult for third-party developers
  • Lacks native web browser rendering capabilities

When to choose which format

DICOM-RLE
Use DICOM-RLE when…
  • Medical Imaging
  • Ultrasound
  • X-Rays / CT / MRI
  • PACS Archives
DXF
Use DXF when…
  • Cross-Platform CAD Data Exchange
  • CNC Machining and Laser Cutting Paths
  • PCB Design Outlines
  • Architectural 2D Layouts

More comparisons

DICOM-RLE vs ACES → DXF vs ACES → DICOM-RLE vs APNG → DXF vs APNG → DICOM-RLE vs AVCI → DXF vs AVCI → DICOM-RLE vs AVCS → DXF vs AVCS → DICOM-RLE vs AVIF → DXF vs AVIF → All comparisons →
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