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What is a PACS System?

Types of PACS
Full PACS handle images from various modalities, such as ultrasonography, magnetic resonance imaging, positron emission tomography, computed tomography, endoscopy, mammography and radiography (plain X-rays).

Uses
PACS replaces hard-copy based means of managing medical images, such as film archives. It expands on the possibilities of such conventional systems by providing capabilities of off-site viewing and reporting (distance education, tele-diagnosis). Additionally, it enables practitioners at various physical locations to access the same information simultaneously (teleradiology). With the decreasing price of digital storage, PACS systems provide a growing cost and space advantage over film archives. PACS is offered by virtually all the major medical imaging equipment manufacturers, medical IT companies and many independent software companies. The most difficult area for PACS systems is interpreting the DICOM image format which is implemented slightly differently among different radiology equipment vendors. The ability to point the tags in the DICOM format coming from vendors equipment to usable titles in a PACS is a feature common to most vendors and software offerings

Architecture
Typically a PACS network consists of a central server that stores a database containing the images connected to one or more clients via a LAN or a WAN which provide or utilize the images. Web-based PACS is becoming more and more common: these systems utilize the Internet as their means of communication, usually via VPN (Virtual Private Network) or SSL (Secure Sockets Layer). The software (thin or smart client) is loaded via Java. Definitions vary, but most claim that for a system to be truly web based, each individual image should have its own URL. PACS workstations offer means of manipulating the images (crop, rotate, zoom, brightness, contrast and others). Modern radiology equipment feeds patient images directly to the PACS in digital form. For backwards compatibility, most hospital imaging departments and radiology practices employ a film digitizer. The medical images are stored in an independent format. The most common format for image storage is DICOM (Digital Imaging and Communications in Medicine).

Integration
A full PACS system should provide a single point of access for images and their associated data (i.e. it should support multiple modalities). It should also interface with existing hospital information systems: hospital information system (HIS) and radiology information system (RIS).

Interfacing between multiple systems provides a more consistent and more reliable dataset:

Less risk of entering an incorrect patient ID for a study – modalities that support DICOM worklists can retrieve identifying patient information (patient name, patient number, accession number) for upcoming cases and present that to the technologist, preventing data entry errors during acquisition. Once the acquisition is complete, the PACS can compare the embedded image data with a list of scheduled studies from RIS, and can flag a warning if the image data does not match a scheduled study.

Data saved in the PACS can be tagged with unique patient identifiers (such as a social security number or NHS number) obtained from HIS. Providing a robust method of merging datasets from multiple hospitals, even where the different centers use different ID systems internally.

An interface can also improve workflow patterns:

• When a study has been reported by a radiologist the PACS can mark it as read. This avoids needless double-reading. The report can be attached to the images and be viewable via a single interface.
• Improved use of online storage and nearline storage in the image archive. The PACS can obtain lists of appointments and admissions in advance, allowing images to be pre-fetched from nearline storage (for example, tape libraries or DVD jukeboxes) onto online disk storage (RAID array).
• Recognition of the importance of integration has led a number of suppliers to develop fully integrated RIS/PACS systems.

These may offer a number of advanced features:

• Dictation of reports can be integrated into a single system. The recording is automatically sent to a transcriptionist's workstation for typing, but it can also be made available for access by physicians, avoiding typing delays for urgent results, or retained in case of typing error.
• Provides a single tool for quality control and audit purposes. Rejected images can be tagged, allowing later analysis (as may be required under radiation protection legislation).
• Workloads and turn-around time can be reported automatically for management purposes.

Many facilities have found that they do not need or cannot afford a full enterprise PACS system. The high costs of PACS has led to the advent of our web based PACS system, a cost-effective alternative to enable physican clinics and imaging centers to implement a digital image management system. The PACS combines the powerful archive software, Web-based DICOM viewer, integrated RIS patient schedule module, DICOM router and DICOM to CD software all tied into a 1-4 TB Server.

This new turnkey solution provides a system comparable to a hospital enterprise system, but at an affordable price. Most PACS systems require several different components to go digital. The PACS includes all modules of the system within one convenient turnkey product.

Need an affordable option for a HIPAA compliant off-site disaster recovery solution? The PACS comes with an option to securely back up all studies to our off-site backup servers, which in the event of an unforeseen disaster, you will have immediate access to all of your images and patient information.