PACS & Clinical Imaging Glossary

Key Terms Every Radiology and Cardiology Team Should Know
Plain-language definitions of the standards, protocols, and concepts that drive modern diagnostic imaging workflows—from DICOM and HL7 to cloud archiving and structured reporting.

A

Advanced Visualization (AV / 3D Post-processing)
Software tools that go beyond basic image display to enable three-dimensional rendering, multi-planar reconstruction (MPR), volume rendering, and quantitative analysis. Advanced visualization workstations allow radiologists and cardiologists to manipulate raw volumetric data from CT or MRI acquisitions to surface clinically meaningful structures. Freeland Systems AccessPoint integrates with advanced visualization tools to support multi-modality review without requiring a separate workstation login.

Anonymization / De-identification
The process of removing or masking protected health information (PHI) from a DICOM study so it can be used for research, teaching, AI model training, or interoperability testing without violating patient privacy. DICOM defines a set of attributes that must be altered or removed, including patient name, date of birth, accession number, and device serial numbers.

Audit Trail
A chronological log of who accessed, modified, or transmitted patient imaging data. Audit trails are a HIPAA requirement and are integral to enterprise PACS deployments. They capture user identity, timestamp, action type, and the study or record affected, providing accountability and enabling forensic investigation when needed.

C

Cloud PACS
A Picture Archiving and Communication System hosted in a cloud infrastructure rather than on local hardware. Cloud PACS eliminates the capital expense of on-site servers, enables anywhere-access for remote reads, scales storage automatically, and supports multi-site organizations under a single platform. Disaster recovery, software updates, and infrastructure maintenance shift to the vendor. AccessPoint Clinical Imaging Cloud is Freeland Systems’ flagship cloud PACS platform, trusted across more than 1,800 installations serving hospital systems, private practices, and mobile imaging providers. Schedule a demo to see it in action.

CVIS (Cardiovascular Information System)
A specialized clinical information system designed to manage cardiovascular imaging studies, hemodynamic data, procedure logs, and structured cardiology reports. A CVIS integrates with echocardiography, nuclear cardiology, vascular ultrasound, and cath lab equipment. Standalone CVIS platforms are increasingly converging with enterprise PACS to reduce siloed data and redundant infrastructure. Learn more about Freeland Systems’ cardiology solutions.

D

DICOM (Digital Imaging and Communications in Medicine)
The universal standard governing how medical images are formatted, stored, transmitted, and displayed. Every imaging modality—CT, MRI, ultrasound, X-ray, nuclear medicine—produces DICOM files. The standard defines not only the image encoding but also the metadata embedded within each file: patient identifiers, acquisition parameters, modality type, referring physician, and more. DICOM also specifies services like C-STORE (send), C-FIND (query), C-MOVE (retrieve), and C-GET. First published in 1993, DICOM is maintained by NEMA and updated regularly to accommodate new modalities, workflow integrations, and security requirements.

DICOM Web (DICOMweb: WADO, STOW, QIDO)
A suite of RESTful web services defined by DICOM for retrieving, storing, and querying imaging data over standard HTTP/HTTPS. The three core services are WADO-RS (retrieve), STOW-RS (store), and QIDO-RS (query). DICOMweb enables zero-footprint viewers and cloud-native integrations that were impractical with traditional DICOM networking. The full specification is maintained at dicomstandard.org.

DICOM Structured Report (DICOM SR)
A machine-readable DICOM object that encodes clinical findings and measurements in a coded, hierarchical format rather than free text. SR documents link measurements directly to the images from which they were derived, enabling downstream data mining, AI training, and longitudinal outcome tracking. Cardiology and oncology workflows depend heavily on SR for structured echo reports, stress test results, and tumor tracking. See how Freeland Systems supports structured reporting.

E

EHR / EMR Integration (Electronic Health / Medical Record)
The connection between a PACS or imaging platform and a clinical electronic health record system. Integration typically uses HL7 messaging or FHIR APIs to synchronize orders, demographics, report results, and image links. Deep EHR integration enables single-sign-on access to imaging from within a clinician’s existing workflow, reducing context switching and eliminating redundant data entry.

Enterprise Imaging
A strategy and platform architecture that consolidates medical imaging from all departments—radiology, cardiology, pathology, ophthalmology, dermatology—into a single vendor-neutral repository with unified access, governance, and analytics. Enterprise imaging platforms eliminate departmental silos, reduce licensing redundancy, and give health systems a comprehensive view of all imaging data for any given patient. Read the latest PACS insights from Freeland Systems.

F

FHIR (Fast Healthcare Interoperability Resources)
A modern health data interoperability standard developed by HL7 International that uses RESTful APIs and JSON/XML-encoded resources to exchange clinical data. FHIR has rapidly become the default integration layer between EHRs, PACS, and third-party clinical applications. Unlike older HL7 v2 messaging, FHIR enables granular, resource-level queries and is designed for cloud-native and mobile contexts. The U.S. federal government’s 21st Century Cures Act mandates FHIR-based data sharing for certified EHR technology.

H

HIPAA (Health Insurance Portability and Accountability Act)
The U.S. federal law establishing national standards for protecting sensitive patient health information. For imaging platforms, HIPAA compliance requires encrypted data at rest and in transit, access controls, audit logging, and Business Associate Agreements (BAAs) with cloud vendors who handle PHI. Every cloud PACS deployment must be fully HIPAA-compliant. Full guidance is available from the U.S. Department of Health & Human Services.

HL7 (Health Level Seven)
A set of international standards for the exchange and integration of clinical and administrative health information, maintained by HL7 International. HL7 v2 messages—particularly ADT (admit/discharge/transfer), ORM (orders), and ORU (results)—have been the backbone of hospital information system integrations for decades. PACS systems use HL7 to receive imaging orders from RIS/HIS platforms and to return completed reports. HL7’s newer FHIR framework is progressively replacing v2 in cloud-based deployments.

I

IHE (Integrating the Healthcare Enterprise)
An international initiative that promotes the coordinated use of established standards—primarily DICOM and HL7—to address specific clinical integration challenges. IHE International publishes Integration Profiles such as XDS-I.b (cross-enterprise document sharing for imaging) and PIXm/PDQm (patient identity management). Vendors that demonstrate IHE compliance at Connectathon events provide stronger interoperability guarantees.

Image Lifecycle Management
The policies and technologies governing how imaging studies are stored, tiered, retained, and eventually purged across their useful lifespan. Most regulatory frameworks require imaging data to be retained for a defined period—commonly 7 to 10 years for adults, longer for pediatric patients. Lifecycle management automates the migration of studies from high-performance online storage to lower-cost nearline or cold archive tiers based on age, access frequency, or retention rules.

M

Modality
The type of medical imaging equipment that acquires a study. Common modalities include CT (computed tomography), MRI (magnetic resonance imaging), US (ultrasound), CR/DX (digital radiography), NM (nuclear medicine), PT (PET), MG (mammography), and ECG. Multi-modality PACS platforms manage imaging data from all modality types within a single unified system.

MWL (Modality Worklist)
A DICOM service that pushes scheduled patient and procedure information from a RIS or HIS to an imaging modality, eliminating manual data entry at the scanner. MWL ensures that acquisitions are correctly attributed to the right patient, the right order, and the right procedure—reducing transcription errors and improving downstream billing and reporting accuracy.

O

Open API (Application Programming Interface)
A publicly documented API that enables third-party developers to build integrations, custom workflows, or applications on top of a PACS or imaging platform. Open APIs allow health systems to connect PACS with clinical decision support tools, AI inference engines, reporting platforms, revenue cycle management systems, and population health dashboards. Freeland Systems’ AccessPoint platform exposes open API technology to support custom integrations and third-party application development.

P

PACS (Picture Archiving and Communication System)
The foundational technology platform for storing, retrieving, distributing, and displaying medical images across a healthcare organization. A PACS receives DICOM images from modalities, archives them to storage, and serves them to diagnostic workstations or zero-footprint web viewers. Modern PACS platforms also manage worklists, support structured reporting, and integrate with RIS and EHR systems. Freeland Systems AccessPoint is a cloud-native PACS trusted across more than 1,800 installations. Contact us to learn more.

PHI (Protected Health Information)
Any individually identifiable health information maintained or transmitted by a covered entity or business associate. In imaging, PHI includes patient name, date of birth, medical record number, accession number, study date, and any data that could be used to identify the patient. HIPAA mandates strict controls around how PHI is created, stored, accessed, shared, and eventually destroyed.

R

RIS (Radiology Information System)
A software system that manages radiology department operations: scheduling, patient tracking, order management, billing, and report distribution. RIS and PACS are typically closely integrated—the RIS generates the imaging order and worklist; the PACS receives the acquired images and returns the completed report. Many modern platforms merge RIS and PACS functionality or connect them through HL7 and FHIR interfaces.

Remote Read / Teleradiology
The interpretation of medical images by a radiologist or specialist who is physically located away from the site where the study was acquired. Cloud PACS enables remote reads at scale by making high-resolution studies accessible through a web browser from any location with a compliant internet connection, without requiring a local workstation or VPN. Remote read capabilities are essential for after-hours coverage, subspecialty access, and multi-site networks. See how AccessPoint enables remote clinical review.

S

Structured Reporting
A reporting methodology that organizes radiology and cardiology findings into standardized, coded templates rather than free-text dictation. Structured reports improve consistency, reduce ambiguity, enable data mining for quality improvement and research, and facilitate downstream AI applications. Common frameworks include RadReport templates from RSNA and cardiology-specific templates from ACC/ASE for echocardiography and stress testing. Freeland Systems AccessPoint supports intelligent structured reporting across radiology and cardiology specialties, with templates that capture measurements and link findings directly to source images.

StudyShare™
A secure mechanism for sharing individual imaging studies with referring physicians, patients, or external specialists without requiring the recipient to have an account on the originating PACS. StudyShare links are time-limited and access-controlled, enabling compliant external collaboration without the overhead of full system access provisioning. Freeland Systems’ StudyShare™ is part of the AccessPoint Connected Care Solutions suite.

T

TLS / Encryption (Transport Layer Security)
The cryptographic protocol that secures data in transit across networks. In cloud PACS deployments, TLS 1.2 or 1.3 is required for all DICOM and web service communications carrying PHI. Complementary to TLS, data at rest must be encrypted using AES-256 or equivalent standards. Together, in-transit and at-rest encryption form the baseline security posture for HIPAA-compliant imaging platforms. Learn more about Freeland Systems’ security and compliance posture.

V

VNA (Vendor-Neutral Archive)
A long-term image archive that stores DICOM studies in a standard format independent of any specific PACS vendor. VNAs decouple storage from the viewing and reporting layer, allowing organizations to replace or add PACS platforms without migrating petabytes of data. A true VNA supports standard protocols (DICOM, WADO, XDS-I.b) so any compliant viewer or PACS can retrieve images on demand.

W

WADO (Web Access to DICOM Objects)
A DICOM standard that specifies how imaging objects can be retrieved over standard HTTP. WADO-URI (original) retrieves images via a URL with query parameters. WADO-RS (the DICOMweb variant) uses RESTful endpoints and supports more granular retrieval of studies, series, instances, and metadata. WADO is the foundation that enables zero-footprint web viewers to load images directly from a cloud archive without a DICOM listener on the client device. Full specification at dicomstandard.org.

Worklist
A queue of pending imaging studies assigned to a radiologist or technologist for action. Worklist management is central to PACS and RIS functionality: studies appear on a worklist when an order is placed, they are claimed by the interpreting physician, and they are cleared when a report is finalized and signed. Worklist priority, filtering, and routing rules determine how efficiently a department manages read turnaround times.

Z

Zero-Footprint Viewer
A web-based DICOM image viewer that requires no software installation on the end user’s device. Images are streamed and rendered within a standard browser using HTML5, WebGL, or WebAssembly. Zero-footprint viewers eliminate the IT overhead of workstation configuration and enable clinicians to review studies on any device—desktop, laptop, or tablet—from any location. They are a defining feature of modern cloud PACS solutions. AccessPoint’s zero-footprint viewer supports 4-up display, cine playback, brightness and contrast controls, measurements, and screenshot capture—all within the browser, with no plugin required.


See AccessPoint in Action
Freeland Systems delivers cloud PACS, intelligent structured reporting, and EHR integration purpose-built for cardiology and radiology teams. Trusted across more than 1,800 installations—from hospital systems to private practices and mobile imaging providers.

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