DICOM / DCM Medical Image Viewer will not open? Format and display troubleshooting
Troubleshoot DICOM / DCM Medical Image Viewer by checking signatures, versions, units, coordinates, and browser resources while preserving the source.
Do not rename or overwrite the source first
Make a sample copy and retain the original delivery, size, producer version, and exact error. Load one DCM file, review transfer syntax, rows, columns, and bits allocated, then inspect the grayscale preview. Hide PatientName, PatientID, AccessionNumber, and StudyDate before screenshots.
Recommended troubleshooting order
- Test the page example or a smaller known-good file to confirm browser functionality.
- Check that the file signature matches its extension and it is not a downloaded HTML error page.
- Compare the supported formats and size limit with the specialist checks below.
- Close other heavy tabs and retry in current Chrome or Edge.
- If it still fails, re-export from the producing application and verify in authoritative specialist software.
Checks for this format
- SOP Instance UID and essential exam tags are present
- Rows, columns, bits allocated, and pixel payload agree
- Transfer syntax is one of the currently supported uncompressed formats
- Screenshots contain no names, identifiers, or dates
Common errors and fixes
The file is recognized but no image appears
Its compressed syntax or non-image object may be unsupported; never overwrite the original while converting.
There is only one image and no stack scrolling
This version inspects one file at a time and does not browse DICOMDIR, ZIP, or multi-file series.
When a browser tool is insufficient
- Not a certified medical device and not for diagnosis
- This version previews common uncompressed 8/16-bit grayscale pixels; compressed syntax, series, SR, segmentation, and multiframe objects are incomplete
- Web display does not replace a calibrated workstation or radiology report
A visible preview only proves this parser read some structures. It does not prove engineering, manufacturing, scientific, business, or clinical compliance. Keep validation records from the source and receiving systems.
Privacy and safety
The tool reads files locally and does not upload them to FreeTool for parsing. Troubleshooting screenshots, CSV exports, and downloads can still contain sensitive data; de-identify before sharing and clear copies from shared devices.