Today, the digital transformation of radiology has effectively completed the transition from analog and intermediate technologies to fully integrated digital systems. The choice between Direct Radiography (DR) and Computed Radiography (CR) for most clinics is no longer just a technical one — it is strategic and economical. Analyzing modern requirements for examination speed, image quality, integration with PACS/RIS and workflow optimization, it is possible to clearly outline the advantages of direct digital radiography over systems with phosphor cassettes.
CR works on the basis of photostimulated luminescence: X-ray radiation is recorded on a film with a phosphor, which then converts the accumulated glow into a digital image in a special digitizer. Despite the fact that CR is already a digital technology, it has several important limitations: the need to physically read each plate slows down the work cycle, increases the time from shooting to diagnosis and requires maintenance of the digitizer. In addition, CR cassettes need to be replaced periodically, which makes them consumables. This approach was a transitional stage between film radiography and fully digital solutions. However, in modern clinical conditions, the need to physically move cassettes, scan them, and reuse them creates additional time costs and risks of artifacts. In fact, this is a repetition of the logic of the film era, but with an additional digitization stage. In 2026, taking pictures on film or cassettes with subsequent scanning is a technologically outdated approach that does not meet the standards of efficiency and automation of the diagnostic process.
Instead, DR systems use integrated flat-panel digital detectors that directly convert X-ray radiation into an electrical signal with instant formation of a digital image. This architecture provides a significantly higher detection quantum efficiency (DQE), a wide dynamic range, and stable spatial resolution. The absence of a mechanical reading stage reduces the time between exposure and image appearance to a few seconds, which directly affects the speed of diagnosis for patients.
Compared to CR, the use of flat panel detectors has significant advantages in all types of X-ray systems. In stationary X-ray installations (2-station systems), DR allows for instant image acquisition with minimal delay, which is critical during high patient flow. DR detectors provide higher detail, better contrast and a wider dynamic range, which significantly improves the quality of diagnostics in standard and complex examinations. Since data is transmitted without physical media, the risk of artifacts and plate damage is reduced.
In combined X-ray/fluoroscopic systems (3-station systems), the advantages of DR become even more noticeable. Traditional analog fluoroscopic solutions with electron-optical converters (EOCs) have low contrast, significant noise, limited resolution and, most importantly, do not have the ability to save the fluoroscopic examination.
The modern solution is dynamic flat panel detectors (Digital Fluoroscopy Flat Panel Detectors), which are a universal technological platform for X-ray diagnostics, combining the capabilities of digital radiography and digital fluoroscopy in one receiving module. The key difference between dynamic detectors and standard DR panels is the ability to operate both in single-exposure mode with high spatial resolution (radiography) and in continuous or pulsed reading mode with high frame rate (fluoroscopy).
In mobile (room) X-ray systems, the transition to DR has become a de facto standard. The use of wireless flat panel detectors allows you to obtain images directly at the patient's bedside with instant transmission to the central archive. The use of CR cassettes in such conditions significantly slows down the process, as it requires returning the cassette to the scanner for digitization, which contradicts the concept of rapid diagnostics in intensive care units.
In surgical practice, C-arms with flat panel detectors are also increasingly replacing systems with EOP. During orthopedic, vascular and neurosurgical interventions, high spatial contrast resolution and stability of the image geometry are decisive. In addition, the flat panel detector, due to its square dimensions, has a larger field of view, which is critically needed during orthopedic interventions.
In mammography, the transition to DR is of even greater clinical significance. Detection of microcalcifications and early signs of breast carcinoma requires maximum contrast sensitivity and minimum dose. Digital mammography detectors provide stable image quality, the possibility of tomosynthesis and integration with artificial intelligence algorithms for screening. CR-mammography does not provide a sufficient level of detail and in 2026 it will be considered is considered an outdated technology.
Another important aspect is the retrofitting of old film X-ray machines. Clinics with limited budgets can significantly upgrade their existing equipment by installing a flat panel detector instead of a film receiver and integrating a modern image processing station that automatically receives, processes and transmits digital images to PACS/RIS. This conversion procedure is called retrofitting and allows you to significantly extend the operational life of the machines, while obtaining all the advantages of digital radiography without significant capital costs for a new installation.
Economic analysis of operation shows that although the initial investment in flat panel detectors is higher compared to CR systems, the total operating costs over the life cycle of the DR equipment are lower due to the absence of costs for CR cassettes, reduced examination time.
Therefore, in modern clinical settings, the use of digital X-rays is technically and economically more advantageous than CR and even more so than old analog solutions with EOP or films, providing better image quality, faster work cycle, lower operating costs and wider integration possibilities with the digital infrastructure of the medical institution. Retrofit programs allow medical institutions with limited budgets to modernize existing equipment, quickly moving to a digital workflow without significant capital investments.
