The History of Radiology

Radiology as a field started in 1895, and over the next century, the field advanced quickly. A series of breakthroughs changed how physicians diagnose and treat disease. The history of radiology timeline below traces the discoveries, technologies and organizations that shaped medical imaging.

Take a look at how we got from the early innovations to the digital infrastructure healthcare organizations depend on today.

The Beginning of Radiology in the Late 19th Century

The history of medical imaging as we know it began on November 8, 1895. Wilhelm Conrad Röntgen was experimenting with a Crookes tube when an unknown form of radiation passed through a solid object and exposed photographic plates. The result revealed structures invisible to his naked eye.

Röntgen’s most famous image is an X-ray of his wife Anna’s hand, which showed her bones and wedding ring. The image might be rudimentary, but it’s easy to see how it paved the way for the high-tech X-ray imaging we have today.

This accidental discovery was the beginning of a much safer, noninvasive method for examining internal anatomy. Within a few months, hospitals and physicians started using X-rays in their practices.

A year later, in 1896, Antoine Henri Becquerel discovered that uranium salts emitted radiation. Marie and Pierre Curie expanded on his research and found new ways to make X-ray technology accessible, like Marie Curie’s mobile radiography units, which were used years later in World War I to speed up assessment and treatment of injured soldiers.

Research Accelerates in the Early 20th Century

Radiology quickly became the go-to imaging technology, with Thomas Edison’s fluoroscope making X-ray viewing easier. The new technology enabled doctors to examine patients more quickly and in greater detail.

The early 20th century also started showing growing evidence of radiation injuries. In 1904, the first ever death from radiation was recorded. Edison’s assistant, Clarence Dally, suffered severe radiation injuries over the years working with X-rays and eventually died from aggressive cancer.

As more radiologists started showing signs of injury, medical professionals began introducing the following:

• Lead shielding
• Protective barriers
• Exposure monitoring 
• Dose limitations

The Evolution of Imaging Media — 1910s-1920s

Around this time, radiology equipment also began changing for the better. As popular as radiology was, the machines proved to be fragile, heavy and difficult to transport or store. These limitations meant that many medical centers weren’t using the technology — either because they didn’t have space or the power to operate the machines.

In the 1910s-1920s, George Eastman introduced film-based radiography, which significantly lowered the weight and increased the durability of X-ray images. The easier handling made it quicker to access images and improved clinical workflows.

Film technology was a critical step in the history of radiologic technology, as it made the technology accessible to facilities that couldn’t use it before.

Major Radiology Organizations Start — 1915

While the American Roentgen Ray Society (ARRS) started in 1900, it existed as a place for doctors and scientists to learn about X-ray technology and safety. Doctors and scientists came together with new ideas while the radiology profession was still in its early stages.

As the radiology field expanded rapidly, it created a need for standardized education, certification, research protocols and safety guidelines. In 1915, the Radiological Society of North America (RSNA) formed as a collaborative space for radiology research and education.

In 1920, the American Society of Radiological Technologists (ASRT) was started in order to promote education and professional development for imaging personnel. It was followed in 1923 by the American College of Radiology (ACR), which developed accreditation programs, practice guidelines and quality standards for imaging facilities.

The American Registry of Radiologic Technologists (ARRT) later established certification and credentialing standards for imaging professionals throughout the United States. Professional credentialing improved the quality of radiographic examinations and advanced radiographers as a distinct healthcare profession.

New Modalities Arise in the Mid-20th Century

Between the 1940s and 1980s, new imaging modalities expanded diagnostic capabilities far beyond conventional X-rays. Each new modality allowed physicians to see more clearly and diagnose more accurately. With increased viewing and diagnosing abilities came improved treatment for a variety of conditions.

Nuclear Magnetic Resonance (NMR) Foundations — 1940s

During the 1940s, Felix Bloch and Edward Purcell proved that atomic nuclei respond in predictable ways to magnetic fields and radiofrequency energy. Their research into nuclear magnetic resonance (NMR) was the precursor to magnetic resonance imaging (MRI), which is one of our main modalities today.

The discoveries earned both scientists the Nobel Prize in Physics in 1952 and created the foundation for one of medicine’s most powerful imaging technologies.

Medical Ultrasound Develops — 1940s

Also in the 1940s, researchers, most notably Karl Theodore Dussik, explored the early medical applications of ultrasonic energy.

Medical ultrasound was built on the same idea as sonar technology, which was developed to detect underwater objects using high-frequency sound waves. Researchers realized they could use the same concept to detect unusual tissues within the body.

In the 1950s, Ian Donald realized that sound waves could produce diagnostic information without ionizing radiation, offering a safer alternative for certain clinical applications. The most important application of this came in fetal development research.

Real-Time Ultrasound and Routine Pregnancy Monitoring — 1960s-1970s

During the late 1960s, real-time ultrasound systems became the latest technology, and medical facilities continued to adopt them throughout the 1970s. The continuous image display allowed physicians to observe fetal movement, cardiac activity and organ motion rather than viewing static images.

Ultrasound became a standard tool for pregnancy monitoring during this time, because it provided valuable diagnostic information without exposing babies and mothers to radiation.

Positron Emission Tomography (PET) Scans — 1970s

The first tomographic imaging device, PC-I, was completed in 1969. It used two two-dimensional detector arrays with rotation and translation to produce images both parallel to and within a subject.

In early 1970, David Chesler of the MGH Group tested a technology called “filtered back projection,” which he later applied to PC-I data. The images to come out of this experiment were named positron emission tomography (PET).

PET uses radioactive tracers to map metabolic activity throughout the body, providing information about disease processes that may not yet be visible. This type of imaging reveals how organs and tissues function at the molecular level, offering insights that conventional imaging cannot.

PET-CT scanners followed in the 90s, which gave radiographers a combination of metabolic and anatomical information. PET-CT became particularly valuable in cancer detection, staging, treatment planning and response assessment, because of the metabolic nature of the disease.

CT Scanners Transform Diagnostics — 1970s

While working at EMI Laboratories, Sir Godfrey Hounsfield developed the first clinically successful computed tomography (CT) scanner. CT scans revealed structures that stayed hidden on conventional radiographs. This added functionality greatly improved visualization of the brain, chest, abdomen and internal organs.

In 1971, medical teams performed the first CT brain scan at Atkinson Morley Hospital in London, showing a brain tumor. CT entered broader clinical use during the early 1970s as additional systems became available in major medical centers.

Godfrey Hounsfield and Allan Cormack independently developed the foundational work behind CT scanning. Both men received the Nobel Prize in Physiology or Medicine in 1979 for their contributions to medical imaging.

NMR and MRI — 1970s

Although NMR research started in the 1940s, Paul Lauterbur was the first to create an NMR image in 1973, using magnetic field gradients. The two-dimensional NMR image proved that magnetic resonance could be used for imaging rather than just chemical analysis, which had been its main purpose.

Raymond Damadian investigated how magnetic resonance signals differed between healthy and diseased tissues during the early 1970s. In 1977, his team performed one of the earliest whole-body MRI scans on a human subject using a custom-built scanner.

The Digital Transformation of Images — 1980s

As digital imaging expanded during the 1980s, equipment manufacturers developed new image formats that often couldn’t communicate with systems from competitors. To address these challenges, the ACR and the National Electrical Manufacturers Association (NEMA) collaborated on standards that evolved into the Digital Imaging and Communications in Medicine (DICOM) standard.

DICOM established a universal framework for storing, transmitting and displaying medical images. This standardized approach enables communication between imaging modalities, archives, workstations and healthcare information systems regardless of manufacturer.

Functional MRI (fMRI) and Brain Imaging — 1990s

Functional MRI expanded magnetic resonance imaging beyond just anatomical visualization by measuring changes in blood oxygenation associated with neural activity. Researchers started using fMRI to study brain regions involved in movement, language, memory and sensory processing.

Unlike earlier brain imaging methods, fMRI required no radioactive tracers, so it was safer for repeated use and more accessible for ongoing research. Its relatively high spatial resolution allowed scientists to pinpoint active brain regions with greater precision than before.

The technology has become an important tool in neuroscience research, cognitive studies and pre-surgical planning for patients with brain tumors or epilepsy.

Picture Archiving and Communication Systems (PACS) — 1990s-2000s

Film was a huge step forward in the field, but PACS replaced physical film archives with digital image management during the 1990s and early 2000s. The system enabled healthcare organizations to store, retrieve, distribute and view imaging studies without handling or storing physical film.

Radiologists and referring physicians could access images within seconds rather than waiting for manual retrieval from film libraries. The PACS technology dramatically improved workflow efficiency, allowing for easier remote consultation and supporting clinical collaboration across different departments or facilities.

Teleradiology and Integrated Electronic Medical Records (EMR)

Digital imaging led to the establishment of teleradiology, so radiologists can interpret studies from virtually any location with network access. This remote interpretation expands access to specialist expertise and supports after-hours coverage for facilities without on-site radiologists.

Integration with EMR connects imaging studies to patient histories, laboratory results and clinical documentation, for a more connected healthcare environment.

Combined technologies improved diagnostic accuracy and care coordination across medical specialties, which goes a long way toward streamlining the diagnosis-to-treatment process. For patients moving from one specialist to another, there’s no need for doctors to send physical X-rays from practice to practice.

What Does the Future Hold for Contemporary Radiology?

Radiology continues to evolve, especially with advances in AI, image-guided treatment and emerging imaging technologies. Modern innovation focuses on improving diagnostic accuracy and patient outcomes across diverse clinical settings.

Artificial Intelligence (AI) in Medical Imaging

AI features are becoming more prominent in imaging technology. They support image analysis, workflow prioritization, quality control and diagnostic decision-making in contemporary radiology departments.

Machine learning systems make it easier for radiologists to identify patterns within large image datasets, so diagnosis becomes quicker and more accurate. AI algorithms assist with tasks such as lesion detection, measurement automation and study triage.

AI assistance can also help radiologists manage increasing examination volumes with more ease and without compromising quality. Current applications focus on being a helpful addition to clinical expertise rather than replacing human interpretation.

The Growth of Interventional Radiology

Interventional radiology uses imaging guidance to perform minimally invasive diagnostic and therapeutic procedures. Techniques such as angioplasty, embolization, tumor ablation and image-guided biopsies allow physicians to diagnose and treat disease with faster recovery times compared with traditional surgical approaches.

Interventional radiology expanded treatment options for vascular disease, cancer and traumatic injuries. The minimally invasive nature of interventional radiology means both the actual session and recovery are faster than surgical options.

Celebrating the International Day of Radiology

Established in 2012, the International Day of Radiology occurs annually on November 8, the anniversary of Röntgen’s discovery of X-rays. The event promotes awareness of medical imaging’s role in diagnosis, treatment and patient care while recognizing the field’s historical achievements and contemporary contributions. Professional organizations worldwide participate in educational activities and public outreach during the annual celebration.

Color X-Ray Development as a Future Innovation

Researchers continue to explore color X-ray imaging systems that analyze X-ray energy levels separately rather than producing conventional grayscale images. Although still under development, these technologies may improve tissue characterization and provide additional diagnostic information beyond traditional radiography. 

Contact Candelis to Learn How We're Powering the Next Chapter in Radiology 

The evolution from glass plates to enterprise-wide digital ecosystems created a growing need for scalable image management infrastructure. Modern healthcare organizations depend on technologies that support image storage, accessibility, interoperability and workflow efficiency across increasingly complex imaging environments. 

Candelis ImageGrid PACS represents the latest stage in radiology’s technological progression, providing the digital foundation required to support contemporary imaging workflows and future innovations. Our fully featured radiology viewers, expandable cloud storage and seamless integrations help facilities manage growing image volumes without sacrificing speed or accessibility. 

Contact us to learn how Candelis ImageGrid DICOM Router and ImageGrid PACS can support your modern radiology department and make your workflows more efficient.