Description
Uncompressed zero-based sample-element offset for DICOM planar versus interleaved storage, excluding bit packing and frame byte offsets.
An image grid has array indices as well as physical spacing, timing, and signal conventions. A calculation on supplied metadata describes one part of that grid or signal; it does not inspect an image, validate a complete file, or interpret anatomy.
Uncompressed zero-based sample-element offset for DICOM planar versus interleaved storage, excluding bit packing and frame byte offsets.
When to use this tool
Use it for dicom planar configuration pixel offset when the required inputs and conventions are already available.
How to use the tool and how it works
- Enter pixelIndex, sampleIndex, pixelsPerFrame, samplesPerPixel, planar. Use the stated units and boundary conventions.
- Run the calculation. Correct any input error before interpreting a result.
- Read elementOffset. Inspect any known, defined, inclusion, or boundary flags before interpreting numeric values.
Require positive pixelsPerFrame, samplesPerPixel from one through 16, and zero-based indices within their respective ranges. For planar storage calculate sampleIndex*pixelsPerFrame+pixelIndex; otherwise calculate pixelIndex*samplesPerPixel+sampleIndex.1
DICOM distinguishes planar sample storage from interleaved sample storage.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| pixelIndex | Pixel Index | Required. Safe integer; minimum 0. |
| sampleIndex | Sample Index | Required. Safe integer; minimum 0. |
| pixelsPerFrame | Total pixels in the modeled frame. | Required. Safe integer; minimum 1. |
| samplesPerPixel | Samples per pixel, from one through 16. | Required. Safe integer; minimum 1; maximum 16. |
| planar | Planar | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| elementOffset | Zero-based offset in sample elements, not bytes. | Required. Safe integer. |
{
"input": {
"pixelIndex": 4,
"sampleIndex": 1,
"pixelsPerFrame": 10,
"samplesPerPixel": 3,
"planar": false
},
"output": {
"elementOffset": 13
}
}Limitations and assumptions
- The output is a sample element offset, not a byte offset. Bit packing, frame offsets, transfer syntax, compression, and endianness are outside this single-frame indexing calculation.
- The field tables describe structural bounds; the mechanics also state cross-field requirements. Malformed input shapes, disallowed keys, and invalid domains cause input errors. Results must remain finite and within the declared output contract. A successful false flag or zero placeholder is distinct from an error.
- Numeric arithmetic uses binary floating point. Exact comparisons have no hidden tolerance or decimal rounding; negative zero is exported as zero. Decimal-text integer operations retain the exactness specifically stated above.
Alternative or Complementary methods
For dicom planar configuration pixel offset, check the source records and the supplied rule before comparing the result with another method. Use a full image reader and geometry or signal analysis when the task requires interpreting image data.
References
Similar or alternative tools
- DICOM Pixel Representation Signextension Mask
Unsigned-word masking and two-complement interpretation/sign extension for at most 32 stored bits; no endian or transfer-syntax decoding.
- DICOM Pixel Spacing Row Column Crosswalk
DICOM Pixel Spacing order is row then column, in millimeters; distances are in the image plane, not patient-coordinate reconstruction.