How to Open a Hospital Scan CD on a Mac

You’ve had a scan, and the hospital handed you a CD. You put it in your Mac, double-click the program on it, and nothing happens. The images aren’t lost: the program just isn’t made for a Mac.

Why it doesn’t open

A scan CD holds two things:

• The images, as DICOM files: the standard format every scanner and hospital system uses. Often they’re in a folder called DICOM, with short names and no extension (IM000001).
• A viewer program to show them, so you can look without installing anything. That program is nearly always made for Windows (VIEWER.EXE or similar), and macOS can’t run it.

So the program is useless on a Mac, but the images are standard files that any DICOM viewer reads.

Step 1: get the CD’s files onto your Mac

Macs haven’t had a built-in CD drive for years, so you’ll likely need a USB CD or DVD drive. Once it’s connected, the CD appears in Finder like a USB stick.

Copy the whole CD into a folder on your Mac, for example Scans 2026-11 in Documents. Reading from a folder is much faster than reading from the CD, and you keep a copy when the CD gets scratched or lost.

No drive at all? Ask the hospital or imaging center for the same images as a download. Many offer it through their patient portal, usually as a ZIP.

Step 2: open the folder in a DICOM viewer

The quickest way needs no installation:

1. Open our free DICOM viewer in Safari or Chrome.
2. Click Open a folder and choose the folder you copied (or the CD itself).
3. The images open as a series. Scroll through them with the mouse wheel or the arrow keys.

The files are read in the browser on your Mac and never uploaded. Click Close and delete when you’re done.

Got a ZIP? Many CDs and most downloads hold the images as a ZIP file. You don’t need to unzip it: click Open files and choose the ZIP. It’s unzipped in your browser, on your Mac.

Prefer an app? Two free ones run on a Mac: Horos (macOS only) and Weasis (macOS, Windows and Linux).

Step 3: if some images still won’t show

A CD can hold several series: different scans, or the same scan reconstructed in different ways. If the one you expected isn’t shown, open its folder on its own.

If a viewer says the files are compressed in a format it can’t read, that’s the transfer syntax. Why a DICOM file won’t open explains it, with the free command that converts the files.

What the viewer can and can’t tell you

You can look through every image, change the contrast, zoom and measure. What the images mean is in the radiologist’s report, which is often a PDF or a printout that came with the CD. A viewer is for looking, not for diagnosis.

Key takeaways

• The CD’s own viewer is a Windows program; the images are standard DICOM files.
• Copy the CD to a folder on your Mac first: faster, and you keep a copy.
• Open the folder in a browser DICOM viewer, or in a free app like Horos or Weasis.
• A ZIP opens directly in the viewer; no need to unzip it first.
• No CD drive? A USB drive works, or ask for a download link.

Open the DICOM viewer →

Run a practice or an imaging center? We’re glad to share what we know. When you want a portal that makes all of this easy for your patients, we’ll build it for you, and because we work with AI-assisted development, it costs far less than you might expect. Let’s talk.