Hospital CD, USB & DICOM files: what patients should know

If you were handed a disc, thumb drive, or a zip file from a patient portal, you probably have DICOM imaging. Here is how that fits together — and how DICOM Reader uses those files to produce a plain-English, informational summary (not a diagnosis).

Why do hospitals give CDs or USB drives?

Imaging centers often release a copy of your raw study so you can bring it to another doctor, a surgeon, or a second facility. The media usually holds the complete study (many slices and series), not just the single “photo” you might imagine.

What are DICOM files?

DICOM is the standard format for medical imaging. Files often end in .dcm or sit inside nested folders. A CT or MRI can contain hundreds of files — that is expected.

• Patient portals may let you download a ZIP; unzip it before upload.
• macOS and Windows do not show DICOM nicely in the file browser; that does not mean the files are broken.
• Some discs include a viewer app; you do not need that app to use DICOM Reader in the browser.

How DICOM Reader uses your study

After you create an account at dicom-reader.com, you upload the folder that contains your DICOM files. The service reads the full study, lets you chat in plain English, and can generate a structured radiology-style write-up with frame-level citations so you can see what the model looked at.

Important: DICOM Reader is assistive software only. It does not provide a medical diagnosis and is not a substitute for a licensed radiologist or physician — including for urgent symptoms.

Related reading

DICOM viewer overview · Understand my scan & report — hub · Patient blog