The Anatomy of Medical Imaging: Essential Features of the DICOM Workflow

The DICOM Workflow - Presented by PostDICOM

Digital medical imaging has become an integral part of radiology. Today’s radiologist needs to be familiar with the technical aspects of medical imaging. At the forefront of medical imaging technology is the DICOM standard. DICOM stands for Digital Imaging and Communications in Medicine. This is a set of standards framed by the American College of Radiology in association with the National Electrical Manufacturers Association. DICOM ensures that medical images meet quality standards, so that the accuracy of diagnosis can be preserved. All imaging modalities, including CT, MRI and ultrasound must conform to the DICOM standards. Images that are in the DICOM format need to be accessed and used through special DICOM applications. While grasping the basic concept of DICOM is simple enough, the process of actually using DICOM-related hardware and software needs greater technical insight. This article explores the various stages of the DICOM medical image workflow.

DICOM medical images go through different processes—acquisition, storage, editing, secondary processing, sharing and printing, and retrieval. All aspects of this workflow are managed by a central server, referred to as PACS.

What is PACS?

At the heart of the entire DICOM workflow process is PACS. PACS stands for Picture Archiving and Communications System. PACS basically acts as a host that stores DICOM-related imaging data and integrates functions related to these images. You need to think of PACS as the central coordinator where multiple processes meet and integrate. An ideal DICOM PACS software should be able to integrate the source equipment, workstations, sharing networks, retrieving and printing equipment.

How has PACS helped improve Digital Imaging Workflow?

In earlier days, medical images acquired by both manual and digital means were printed out as films, or else stored on external devices such as CDs and DVDs. The development of PACS has resulted in a faster and more reliable way of handling medical images. The cost of radiology has decreased because of the reduced need for printed films and hard storage space. Though digital storage was once expensive, the cost has come down considerably over the years. With PACS, the radiologist can manage time better, as images can literally be accessed from anywhere, at any given point of time. The time taken to trace previous images is also reduced. Digital storage of images reduces the chances of inadvertent errors such as mislabelled files and damage to films. The turnaround time to reporting is also lowered because workflow on the whole is enhanced. All this contributes to better patient outcomes.

What are the Components of PACS?

PACS comprises a number of components essential for the DICOM workflow. These are described below:

The source

The source of all medical images is the hardware equipment that generates them. The detector within the imaging equipment recognizes the image and transmits it in a digitized format to the computer on which it can either be viewed at once or stored for viewing at a later date. All images are acquired and stored in the DICOM format.

Notebook PostDICOM Viewer

Cloud PACS and Online DICOM Viewer

Upload DICOM images and clinical documents to PostDICOM servers. Store, view, collaborate, and share your medical imaging files.

Storage of medical Images

Once the images have been acquired from the source, they need to be stored safely. The DICOM server software acts as a filing system to store all images in an organized manner. Images from the DICOM server can either be sent to the digital workstation for interpretation or can be printed. Some advanced DICOM server software applications also allow direct uploading and online sharing of images.

The DICOM workstation

As the name suggests, the DICOM workstation is the area that radiologists use to view and interpret images. The DICOM workstation software is of two types. The first type, called proprietary software, comes along with the source equipment and is usually created by the same manufacturer. This DICOM workstation software must necessarily be used at the same location as the source equipment. The second kind of DICOM workstation software is third-party software, which can be used at a location remote to the source equipment. This kind of software is especially useful in hospitals which have a high inflow of patients coming in for medical imaging examinations. Images can quickly be acquired for each patient, and can be accessed and interpreted by the radiologist at a later date. A third-party DICOM application must be capable of receiving DICOM images from the PACS server. Therefore, this would require DICOM receiver software to be built into the application. DICOM receiver software will allow the radiologist to access images from either the PACS server or from external drives such as CD/DVD drives.

A DICOM workstation software, in addition to opening and receiving capabilities, may have additional features that can help the radiologist improve diagnostic accuracy and track progression of diseases. Some of these features include

Sharing DICOM files

DICOM printer software

Although printing of DICOM medical images is slowly being phased out, there are still instances where printed films can be useful. For example, when surgical procedures are being performed in remote locations (where the operating complex does not have access to the PACS server), it may be helpful to have the films on display. In these instances, a DICOM printer software may be used to aid in printing films from stored DICOM images. Apart from the DICOM printing software, a printer that is capable of printing DICOM images may also be required.

What are some Recent Developments for PACS?

Suitable Software for the entire DICOM-PACS Workflow

To adequately cover the entire DICOM-PACS workflow, you need software that will help you receive the DICOM images from the source (DICOM receiver software), software that will help you view and edit the images (DICOM viewer), software that will help you store all the image data and retrieve it at will (DICOM server software), and software that will help you share and print your medical images (DICOM exporting software and DICOM printing software). Rather than using a multitude of software applications for these purposes, there are programs that fulfil two or more of the above needs. There are, by and large, two kinds of software applications that all radiologists must obtain:

DICOM viewing software

This software primarily allows users to view DICOM images that have been acquired. It usually comes with retrieving and printing capabilities, and some viewers support exporting of files as well. Advanced DICOM viewers have additional workstation features that permit editing and reconstructing of images. A few of the popular DICOM viewers available today include

DICOM server software

It is also called DICOM-PACS software and as the name suggests, it has the capacity to store and retrieve DICOM files. A DICOM-PACS software may have its own viewer or it can be integrated to other DICOM viewers. A few examples of free DICOM PACS viewers are

Of note, there are some very handy applications that combine both a DICOM viewer and PACS into a single software. Of these, PostDICOM ranks among the top. It has a powerful, easy-to-use DICOM viewer that offers all advanced imaging features, including MPR, MIP, MINIP and volume rendering. PostDICOM is among the first applications to offer web-based PACS for storing DICOM images. It allows exporting to multiple formats and sharing images is easier through cloud storage. So if you are looking to simplify your DICOM workflow, give PostDICOM a try!

Notebook PostDICOM Viewer

Cloud PACS and Online DICOM Viewer

Upload DICOM images and clinical documents to PostDICOM servers. Store, view, collaborate, and share your medical imaging files.