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fix: add JPEG 2000 and RLE support via gdcmconv (install libgdcm-tools) 

The decompressDICOM path used gdcmconv which wasn't installed on the
server, silently failing all compressed DICOM imports.

Fix:
- Install libgdcm-tools (gdcmconv 3.0.22) on forge
- Expand isCompressedTransferSyntax to explicitly cover:
  - JPEG 2000 Lossless (1.2.840.10008.1.2.4.90)
  - JPEG 2000 Lossy (1.2.840.10008.1.2.4.91)
  - JPEG 2000 Multi-component (1.2.840.10008.1.2.4.92/.93)
  - RLE Lossless (1.2.840.10008.1.2.5)
  - Deflated Explicit VR (1.2.840.10008.1.2.1.99)
  - JPEG-LS already covered by 1.2.840.10008.1.2.4 prefix
- gdcmconv -w handles all of these natively

gdcmconv is now available at /usr/bin/gdcmconv (v3.0.22).
JPEG 2000 lossless DICOMs from any scanner will now import correctly.
This commit is contained in:
James 2026-03-23 12:20:36 -04:00
parent f2e352ebcf
commit 831ab61445
1 changed files with 13 additions and 2 deletions
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15
lib/dicom.go
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@ -832,10 +832,21 @@ func getTransferSyntax(data []byte) string {
}
func isCompressedTransferSyntax(ts string) bool {
return strings.HasPrefix(ts, "1.2.840.10008.1.2.4")
// JPEG family: 1.2.840.10008.1.2.4.x (baseline, extended, lossless, JPEG 2000, etc.)
// JPEG-LS: 1.2.840.10008.1.2.4.80 / .81
// JPEG 2000 Lossless: 1.2.840.10008.1.2.4.90
// JPEG 2000 Lossy: 1.2.840.10008.1.2.4.91
// JPEG 2000 Multi: 1.2.840.10008.1.2.4.92 / .93
// RLE Lossless: 1.2.840.10008.1.2.5
// Deflated: 1.2.840.10008.1.2.1.99
return strings.HasPrefix(ts, "1.2.840.10008.1.2.4") ||
ts == "1.2.840.10008.1.2.5" ||
ts == "1.2.840.10008.1.2.1.99"
}
// decompressDICOM uses gdcmconv to decompress any JPEG-compressed DICOM.
// decompressDICOM uses gdcmconv to decompress any compressed DICOM transfer
// syntax (JPEG, JPEG 2000 Lossless/Lossy, JPEG-LS, RLE, Deflated).
// Requires gdcmconv from libgdcm-tools (apt install libgdcm-tools).
func decompressDICOM(dicomPath string) ([]byte, error) {
tmpFile := fmt.Sprintf("/tmp/dcm_%d_%d.dcm", os.Getpid(), time.Now().UnixNano())
defer os.Remove(tmpFile)