Digital Radiology and PACS in African Hospitals: Moving Beyond X-Ray Film

What Is PACS and Why Does It Matter for African Hospitals?

A Picture Archiving and Communication System (PACS) is software that stores, retrieves, distributes, and displays medical images in digital format. Before PACS, hospitals managed radiology through physical X-ray film — printed, stored in envelopes, and physically carried between departments. With PACS, images captured from any compatible modality (X-ray machine, ultrasound, CT scanner, MRI) are transmitted to a central digital archive within seconds of acquisition and become immediately accessible from any authorised workstation in the facility.

A Radiology Information System (RIS) is the operational complement to PACS: where PACS stores images, RIS manages the administrative workflow — patient scheduling, order tracking, reporting, and billing. Together, RIS and PACS form the backbone of a modern radiology department. When integrated with a Hospital Management System (HMS), they connect radiology seamlessly to clinical care, pharmacy, billing, and the patient's longitudinal electronic medical record.

For hospitals in Cameroon and the CEMAC region, the transition from film to digital radiology is not merely a technology upgrade — it is a fundamental change in how imaging information is used, shared, and preserved.

The Current State: Film-Based Radiology in Cameroon

Film-based radiology remains the dominant modality in many Cameroonian hospitals, particularly in regional and district facilities. Conventional X-ray film requires a chemical processing darkroom, consistent supply of film and chemical reagents, physical storage for thousands of films, and manual distribution of films between departments.

The practical costs of this model include:

• Supply chain dependency — X-ray film and chemical reagents are imported and subject to supply disruptions and currency fluctuation
• Film loss — Physical films are lost or damaged at high rates; a 2015 review of film-based radiology departments in sub-Saharan African hospitals found film loss rates commonly exceeding 30%
• No remote access — A film in the radiology department cannot be viewed simultaneously by the referring clinician in the ward, the surgeon planning an operation, and the radiologist reporting the study
• Storage burden — A moderately busy radiology department generating 50 films per day produces over 18,000 films per year; physical storage becomes a significant operational problem within two to three years
• Degradation — Films degrade over time, particularly in humid tropical environments, making historical comparison unreliable

Digital radiology eliminates each of these limitations.

Film vs Digital: The Cost Comparison

A common objection to digital radiology adoption in Cameroon is upfront cost. The capital cost of a digital radiography (DR) detector or a computed radiography (CR) system is higher than replacing a film processor. However, a full lifecycle cost analysis consistently favours digital:

At volumes of 20+ studies per day, the break-even point for digital radiology capital investment in a Cameroonian context is typically 18–36 months. Beyond that point, digital operation is substantially cheaper per image than film.

Common Imaging Modalities in Cameroon Hospitals

Not all imaging modalities are equally available across Cameroon's hospital tiers. Understanding the current modality landscape is essential when planning PACS implementation:

Conventional X-ray (radiography) — Present in virtually all hospital-level facilities. The most common imaging modality. Digital X-ray (DR or CR) is increasingly available in urban hospitals. DR provides immediate image display; CR requires a scanning step but is lower cost to implement.

Ultrasound — Widely available. Critical for obstetric care, abdominal assessment, and point-of-care emergency evaluation. Modern ultrasound machines produce DICOM-compliant images that can be transferred to PACS. Many facilities still print ultrasound images on thermal paper, losing the digital advantage.

Computed tomography (CT) — Available in major referral hospitals in Yaoundé and Douala (including the Yaoundé Central Hospital, Hôpital Général de Yaoundé, and Douala General Hospital) and in a small number of mission hospitals. CT scanner numbers are increasing across the CEMAC region.

MRI — Very limited availability in Cameroon. Present in a small number of private facilities and major referral centres. High operating cost due to power requirements and maintenance.

Fluoroscopy and interventional — Limited to tertiary facilities.

A PACS implementation should accommodate all modalities currently in use at a facility and be capable of receiving images from any DICOM-compliant source added in future.

The DICOM Standard

DICOM (Digital Imaging and Communications in Medicine) is the international standard for the transmission, storage, retrieval, and display of medical images. Any imaging device sold today — X-ray, ultrasound, CT, MRI — should be DICOM-compliant. This compliance means images can be sent from any DICOM-compliant modality to any DICOM-compliant PACS, regardless of manufacturer.

When evaluating digital radiology solutions, hospital administrators in Cameroon should confirm:

• All existing and planned imaging equipment supports DICOM export
• The PACS is DICOM-compliant and can receive images from multiple modalities simultaneously
• The RIS supports HL7 messaging for order communication with the HMS
• Images are stored in a format that is exportable and not vendor-locked

DICOM compliance ensures that the hospital's imaging archive remains accessible even if the PACS vendor changes in future.

Teleradiology: Specialist Reads from Remote Radiologists

One of the most transformative capabilities enabled by digital radiology in the African context is teleradiology — the transmission of digital images to a radiologist or specialist in a different location for reporting.

Cameroon faces a significant shortage of qualified radiologists. Most radiologists are concentrated in Yaoundé and Douala. A hospital in Bafoussam, Bertoua, or Maroua may have access to a CT scanner but lack a radiologist to report the studies reliably. Teleradiology enables that facility to transmit images over the internet to a remote radiologist — potentially in another city, or even another country — and receive a structured report within hours.

Teleradiology workflows require:

• A PACS with web-based image viewer accessible from outside the facility network
• Adequate internet bandwidth for image transmission (compressed DICOM images for CT studies can be 50–500 MB)
• A secure connection (VPN or HTTPS encryption) to protect patient data during transmission
• A reporting radiologist with an appropriate workstation and reporting software
• A structured report delivery mechanism that returns the report to the patient's EMR

For district and regional hospitals in Cameroon, teleradiology is not a future ambition — it is an immediately practical solution to radiologist shortage that can be implemented today with appropriate PACS infrastructure.

The Radiology Workflow: Order to Clinician

A well-integrated RIS/PACS workflow runs as follows:

Step 1 — Order

The clinician requests imaging from the patient's EMR. The order specifies modality, anatomical region, clinical indication, and urgency. The RIS receives the order and adds the patient to the radiology worklist.

Step 2 — Patient Registration at Radiology

The patient presents at the radiology department. The receptionist confirms the order and completes any required billing. The study is scheduled and the patient is prepared.

Step 3 — Image Acquisition

The radiographer acquires the images using the relevant modality. Images are transmitted automatically to the PACS via the DICOM network. The radiographer checks image quality and flags any technical issues before releasing the study for reporting.

Step 4 — Reporting

A radiologist or reporting clinician accesses the images on a DICOM workstation or web viewer, dictates or types a structured report, and verifies and releases the report. The report is associated with the study in the PACS and transmitted to the patient's EMR via the RIS-HMS integration.

Step 5 — Clinician Notification

The referring clinician receives a notification that the imaging report is available. They access both the report and the images from the patient's EMR. No physical film is required. No paper report needs to be carried between departments.

Barriers to PACS Adoption and How to Overcome Them

Despite clear benefits, several barriers slow PACS adoption in Cameroonian hospitals:

Capital cost — Addressed through phased implementation (starting with one modality) and cloud PACS subscriptions that replace large capital outlay with monthly operating costs.

Power reliability — UPS systems and surge protection for imaging equipment and servers are non-negotiable. Generator backup for the radiology department is standard in any serious implementation.

Bandwidth constraints — Cloud PACS solutions can be configured to compress and cache images locally, reducing bandwidth requirements. For very low-bandwidth settings, local server deployment with remote access for teleradiology is preferred.

IT capacity — PACS requires basic IT administration. Many facilities benefit from managed PACS services where the vendor handles server maintenance, updates, and backup — reducing the demand on in-house IT capacity.

Staff training — Radiographers and radiologists need training on image acquisition protocols for digital systems. Positioning techniques developed for film may need adjustment for digital detectors to optimise image quality.

How OPES HMS Integrates with Radiology Systems

The OPES Health Systems HMS includes a Radiology Information System (RIS) module that manages radiology orders, patient scheduling, report delivery, and billing within the same platform used across the hospital. When a clinician orders an X-ray or ultrasound from the consultation module, the order appears on the radiology worklist immediately. Completed reports are posted back to the patient's EMR automatically.

OPES HMS is designed to integrate with DICOM-compliant PACS systems and imaging equipment from major manufacturers. For hospitals transitioning from film to digital radiology, OPES can support the implementation planning process, including advising on modality selection, PACS platform options, and teleradiology arrangements suited to the Cameroonian context.

For hospital directors and radiology department heads exploring digital radiology, contact the OPES Health Systems team to discuss how RIS/PACS integration fits within your broader HMS implementation.