Digital radiography extension nears inclusion in DICOMDICOM Committee members are currently voting on a proposed extension to the DICOM standard that would add support for images and information generated by digital radiography systems. With
DICOM Committee members are currently voting on a proposed extension to the DICOM standard that would add support for images and information generated by digital radiography systems. With commercial availability of systems from companies such as Sterling Diagnostic Imaging forthcoming in the next several months
(
PNN
7/98), the committee's timing couldn't be better.
The new proposal differs in a number of ways from the DICOM computer radiography (CR) image definition. For example, specific attributes unique to digital radiography systems, such as detector characteristics, were included.
In addition, the DICOM working group that developed the digital x-ray extension (DX) raised the bar significantly in comparison with other modality image objects already in the standard. Specifically, the group mandated the inclusion of information supporting hanging protocols, which define how a radiologist may prefer to look at an image set, or how a technologist might hang the films on an alternator.
By accommodating hanging protocols in the digital radiography image object, radiologists will not have to flip or rotate the images, invert the gray scale, or perform other operations to make the displayed image conform to their preferences in viewing studies. All attributes that allow a software application at a workstation to support this protocol must be included in the image object, and manufacturers adhering to the standard will not be able to get away with leaving this information out.
In addition to general x-ray uses, the digital x-ray extension also supports other radiographic applications such as digital mammography and intra-oral and panoramic dental x-ray imaging.
The extension offers another improvement over the CR image object. Typically, vendors exchange CR images in one of three ways: as raw unprocessed data, as raw data with look-up tables that enable the image to be viewed correctly at a workstation, or as processed data. Unfortunately, the CR image object doesn't include a mechanism to alert the user or the workstation as to which of the three kinds of data to expect.
The digital x-ray extension resolves this problem by providing the capability for explicit exchanges such as raw data, "for processing" data, or "for presentation" data. This allows institutions to look at the raw image data for quality assurance purposes, or, if they wish, to apply their own image-processing algorithms.
With the new extension accommodating direct digital capture, the DICOM standard will allow these new images to be encoded in a standard manner. By supporting the hanging protocol as well, the extension enables radiology departments to improve their work flow and increase their efficiency.
-Herman Oosterwijk, president, OTech Inc. (herman@otechimg.com)
Stay at the forefront of radiology with the Diagnostic Imaging newsletter, delivering the latest news, clinical insights, and imaging advancements for today’s radiologists.
Study Shows Enhanced Diagnosis of Coronary Artery Stenosis with Photon-Counting CTA
July 10th 2025In a new study comparing standard resolution and ultra-high resolution modes for patients undergoing coronary CTA with photon-counting detector CT, researchers found that segment-level sensitivity and accuracy rates for diagnosing coronary artery stenosis were consistently > 89.6 percent.
FDA Expands Approval of MRI-Guided Ultrasound Treatment for Patients with Parkinson’s Disease
July 9th 2025For patients with advanced Parkinson’s disease, the expanded FDA approval of the Exablate Neuro platform allows for the use of MRI-guided focused ultrasound in performing staged bilateral pallidothalamic tractotomy.