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DICOM viewer for your CD or USB images

Look at the X-ray, CT or MRI images from your hospital CD or USB stick on a Mac, PC or tablet, without installing anything. Choose the whole folder: images stay on your device and are never uploaded. For viewing images, not for diagnosis.

Drop DICOM files or a whole CD/USB folder here

or

Your file stays on this device: it is read here, in your browser, and never uploaded.

Files ending in .dcm, files without an extension, or the whole folder from a patient CD (up to 5000 files).

For viewing images, not for diagnosis. This viewer is not a medical device: rely on your radiologist’s report and your doctor.

How it works

  1. Choose the folder or files

    Choose the whole CD or USB folder, or a few .dcm files. Files that are not images (the viewer program, the index) are skipped.

  2. Pick a series

    Images are grouped into series as the scanner made them (for example “T2 axial”) and sorted in order.

  3. Look and save

    Scroll through the slices, drag to adjust contrast and brightness, invert, and save the image you see as a PNG.

Medical image files, explained

What DICOM is

DICOM (Digital Imaging and Communications in Medicine) is the standard format of medical images: X-ray, CT, MRI, ultrasound, mammography and more. Each file holds one image, or a stack of them, plus details such as the patient’s name, the date and the scanner settings.

What is on a patient CD

A hospital CD or USB stick usually holds a DICOMDIR (an index), folders of image files with names like IM0001 or 00000001 and no extension, and often a viewer program for Windows. That bundled viewer may not run on a Mac, on a newer Windows, or on a laptop without a CD drive, which is why people end up searching for another way to look at their scans.

What this viewer does

  • Reads single files, many files, or a whole folder (up to 5,000 files), and groups them into series.
  • Shows uncompressed images, RLE-compressed images, and 8-bit JPEG images, in grey or colour, single images and multi-frame files.
  • Lets you scroll through slices (slider, arrow keys or mouse wheel), change contrast and brightness (window/level) by dragging or typing values, use CT presets (brain, soft tissue, lung, bone), and invert.
  • Shows the image details from the file: patient, study, series, modality, device, image size, pixel spacing, slice thickness.
  • Saves the image you see as a PNG, for example to show someone.

What it does not do

  • For viewing images, not for diagnosis. It is not a medical device and makes no measurements. The radiologist’s report is what describes your images; ask your doctor about them.
  • Images compressed with JPEG Lossless, JPEG-LS or JPEG 2000 cannot be shown. Many CDs use them; for those, use the viewer on the CD or a free desktop viewer such as Weasis.
  • No 3D, no reconstruction in other planes, no measurements, no reports (structured reports are skipped).
  • A PNG is a picture for viewing, not a medical copy: it does not keep the original data or the patient details.

Your images stay private

Medical images are health data. Here they are read and shown by your own browser; nothing is uploaded: the page’s security rules stop it from sending data to other sites, and neither the files nor their names are sent to our own domain. If you share a PNG, remember that you choose what it shows.

Getting your images and the report

In many countries you have the right to a copy of your images and of the radiologist’s report. If your CD is missing, damaged or unreadable, ask the radiology department or the clinic that did the scan for a new copy, or for a download link.

Frequently asked questions

How do I view my MRI or CT CD on a Mac?

Copy the CD (or open the USB stick) and choose the whole folder here. The Windows viewer on the CD will not run on a Mac, but the image files themselves open in this browser viewer.

Are my images uploaded?

No. They are read in your browser and never leave your device. The page’s security rules stop it from sending data to other sites, and neither the file nor its name is sent to our own domain.

Why do some images not appear?

Either the files are not images (indexes, reports, the viewer program), or they use a compression this viewer cannot decode (JPEG Lossless, JPEG-LS, JPEG 2000). The viewer tells you which. A free desktop viewer such as Weasis can show those.

Can I use this to read my scan?

You can look at your images: the viewer is for viewing images, not for diagnosis. Reading medical images takes training, and this viewer is not a medical device. The radiologist’s report and your doctor are the source for what the images show.

What are window and level?

Medical images hold far more shades of grey than a screen can show. The window is the range of values shown from black to white (contrast), the level is its middle (brightness). CT presets pick values that suit brain, soft tissue, lung or bone.

Can I save the images as JPEG or PNG?

Yes, as PNG, exactly as you see them on the screen. To give your images to another hospital, give them the original CD or files instead: a PNG loses the medical data.

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