Wikipedia
MicroDicom
MicroDicom is a free DICOM viewer for Windows. MicroDicom is application for primary processing and preservation of medical images in DICOM format. You can open DICOM images produced by medical equipment ( MRI, PET, CT, ...). You can also open other image formats - BMP, GIF, JPEG, PNG, TIFF, .... It is equipped with most common tools for manipulation of DICOM images and it has an intuitive user interface. It also has the advantage of being free for use and accessible to everyone.