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DICOM (Digital Imaging and Communications in Medicine)
The universal standard for handling, storing, printing, and transmitting information in medical imaging.
DICOM (Digital Imaging and Communications in Medicine) is the global standard format for medical images and their associated data. Unlike standard image formats like JPEG or PNG, a DICOM file is not just a picture; it is a complex data object that wraps image data (pixels) with a rich set of metadata (header) containing patient information, study details, and technical parameters. First developed in the 1980s by the American College of Radiology (ACR) and the National Electrical Manufacturers Association (NEMA), DICOM ensures interoperability between medical devices from different manufacturers. Whether it's an MRI scanner from Siemens, a CT scanner from GE, or an X-ray machine from Philips, they all speak the core language of DICOM. This allows doctors to view images from any modality on any compliant workstation. A single DICOM file often represents one 'slice' of a larger scan. A full MRI study might consist of hundreds of .dcm files, which specialized viewers assemble into a 3D volume. The format supports various compression methods—including JPEG, JPEG 2000, and RLE—encapsulated within the container.
The DICOM standard (ISO 12052) defines both a file format and a network communication protocol. The file structure consists of a 128-byte preamble followed by a 'DICM' prefix. The data is organized into 'Data Elements,' each identified by a specialized tag (Group, Element) like (0010,0010) for Patient Name. Pixel data is stored in the (7FE0,0010) element. DICOM supports a wide range of pixel depths, from 8-bit to 16-bit grayscale (common in X-ray and CT) and 24-bit color. The 'Photometric Interpretation' tag defines the color space (e.g., MONOCHROME2, RGB, YBR_FULL). Crucially, DICOM supports 'Window Width' and 'Window Center' attributes, allowing radiologists to adjust the contrast and brightness of high-bit-depth images to see specific tissues (like bone vs. soft tissue) without altering the original pixel data.
The history of DICOM traces back to 1983 when the ACR and NEMA formed a joint committee to create a standard for medical imaging. The first version, ACR-NEMA 300, was released in 1985 but required a dedicated hardware interface. Version 2.0 followed in 1988. The breakthrough came in 1993 with the release of DICOM 3.0, which added network support via TCP/IP. This allowed medical devices to communicate over standard hospital networks, leading to the explosion of PACS (Picture Archiving and Communication Systems). The standard is continuously updated by 30+ working groups covering everything from ophthalmology to radiation therapy.
Wireless Bitmap
The pixel format of the Nokia 3310 era.
WBMP (Wireless Bitmap) is a monochrome graphics file format optimized for mobile computing devices using the Wireless Application Protocol (WAP). It was designed for the extremely limited bandwidth and display capabilities of early 2000s feature phones.
A WBMP file is an uncompressed sequence of bits with a minimal variable-byte integer header usually encoding generic type (0), width, and height. It supports only 1-bit color (black and white). There is no compression, palette, or gray scale.
Developed by the WAP Forum to deliver icons and simple graphics to mobile phones over 2G networks.
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