Medical ImagingGenerated accuracy model review: 2026-05-06

PACS Migration Storage Planner accuracy and testing

This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.

Formula source

For each modality, uncompressed TB = study count * uncompressed MB / 1,048,576 and compressed TB = uncompressed TB / compression ratio. Required TB applies growth reserve and migration overhead to compressed image storage.

Test cases

Default input regression check

Generated from the checked-in default inputs and calculate function.

Inputs

CT Studies: 250,000
CT Avg Uncompressed Size: 450 MB
CT Compression Ratio: 2.2 :1
MRI Studies: 160,000
MRI Avg Uncompressed Size: 320 MB
MRI Compression Ratio: 1.8 :1
X-ray / CR / DR Studies: 260,000
X-ray Avg Uncompressed Size: 60 MB
X-ray Compression Ratio: 1 :1
Ultrasound Studies: 90,000
Ultrasound Avg Uncompressed Size: 120 MB
Ultrasound Compression Ratio: 2 :1
Mammography Studies: 65,000
Mammo Avg Uncompressed Size: 850 MB
Mammo Compression Ratio: 1.6 :1
Nuclear / PET Studies: 25,000
Nuclear / PET Avg Uncompressed Size: 500 MB
Nuclear / PET Compression Ratio: 1.5 :1
Other / Mixed Studies: 0
Other Avg Uncompressed Size: 180 MB
Other Compression Ratio: 1 :1
Growth Years to Reserve: 2 yr
Annual Storage Growth: 18%
Migration Overhead: 20%
Migration Throughput: 6 TB/day
Validation Sample: 2%

Expected outputs

Required Storage: 228.6 TB
Compressed Image Storage: 136.8 TB
Uncompressed Image Storage: 245.9 TB
Compression Savings: 109.1 TB
Migration Duration: 38.1
Validation Studies: 17,000
Dominant Image Type: CT

Known limitations

This workflow is a planning aid. Validate assumptions, rates, legal/compliance obligations, vendor quotes, and local policies before acting.

Assumptions

All values are user-entered planning assumptions.
Calculations run locally in the browser.
Saved artifacts are stored only when a signed-in user explicitly saves them.

Unit handling

CT Studies accepts numeric values.
CT Avg Uncompressed Size accepts values in MB.
CT Compression Ratio accepts values in :1.
MRI Studies accepts numeric values.
MRI Avg Uncompressed Size accepts values in MB.
MRI Compression Ratio accepts values in :1.
X-ray / CR / DR Studies accepts numeric values.
X-ray Avg Uncompressed Size accepts values in MB.
X-ray Compression Ratio accepts values in :1.
Ultrasound Studies accepts numeric values.
Ultrasound Avg Uncompressed Size accepts values in MB.
Ultrasound Compression Ratio accepts values in :1.
Mammography Studies accepts numeric values.
Mammo Avg Uncompressed Size accepts values in MB.
Mammo Compression Ratio accepts values in :1.
Nuclear / PET Studies accepts numeric values.
Nuclear / PET Avg Uncompressed Size accepts values in MB.
Nuclear / PET Compression Ratio accepts values in :1.
Other / Mixed Studies accepts numeric values.
Other Avg Uncompressed Size accepts values in MB.
Other Compression Ratio accepts values in :1.
Growth Years to Reserve accepts values in yr.
Annual Storage Growth accepts values in %.
Migration Overhead accepts values in %.
Migration Throughput accepts values in TB/day.
Validation Sample accepts values in %.
Required Storage is displayed in TB.
Compressed Image Storage is displayed in TB.
Uncompressed Image Storage is displayed in TB.
Compression Savings is displayed in TB.

Rounding rules

Number displays use up to 2 decimal places in the calculator UI.
Input precision follows configured step values where provided.

Version history

1.0.0 - 2026-05-06

Generated accuracy and testing page from the current pacs-migration-storage-planner calculator definition.

Change log

2026-05-06

Published default regression test documentation and metadata fallbacks for PACS Migration Storage Planner.

Calculator transparency

Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.

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