Xeroradiography Artifacts - Causes, Treatment & When to See a Doctor

What is Xeroradiography Artifacts?

Xeroradiography (also called xeroradiography) is a dental and medical imaging technique that uses a photoconductive plate coated with a fine layer of selenium. When exposed to X‑rays, the plate produces a latent electrostatic image that is later developed with a dry powder (toner) to create a visible radiograph. An artifact refers to any unintended feature on the final image that does not represent true anatomy. Xeroradiography artifacts are therefore distortions, shadows, or foreign markings that arise from technical, environmental, or patient‑related factors rather than the tissues being examined.

Although xeroradiography has largely been replaced by digital sensors in many countries, the technique is still used for certain dental, forensic, and industrial applications because of its high edge definition. Understanding the origins and implications of artifacts is essential for clinicians, radiology technicians, and patients, because misinterpreted images can lead to unnecessary procedures or missed diagnoses.

Common Causes

The following list summarises the most frequent reasons why artifacts appear on xeroradiographs. Each cause can act alone or in combination with others.

• Improper Plate Handling – Touching the selenium surface with bare hands deposits oils and moisture, creating streaks or dark spots.
• Dust or Toner Contamination – Airborne particles settle on the plate or develop unevenly during the toner‑transfer step, producing speckled or blotchy images.
• Electrostatic Discharge (ESD) – Sudden changes in the plate’s charge, often from nearby electronic equipment, generate “ghost” images.
• Plate Damage or Wear – Scratches, pitting, or fatigue of the photoconductive layer reduce image fidelity and cause linear artifacts.
• Improper Exposure Settings – Over‑ or under‑exposure leads to excessive darkness or a washed‑out background, mimicking pathology.
• Patient Motion – Slight movement during exposure creates blurring or double‑exposure artifacts, especially in the oral cavity.
• Improper Development Time – Over‑development causes thick toner layers (excessive contrast), while under‑development leaves faint, incomplete images.
• Ambient Light Leakage – Exposure of the plate to visible light before or after X‑ray exposure can partially erase the latent image, resulting in partial loss of detail.
• Improper Plate Alignment – Tilting or off‑center positioning relative to the X‑ray beam creates geometric distortion and uneven magnification.
• Chemical Residues – Residual cleaning agents or solvents on the plate surface can react with the selenium, forming irregular dark patches.

Associated Symptoms

Because xeroradiography artifacts are a property of the image rather than a direct clinical condition, they do not produce “symptoms” in the patient. However, they can be associated with certain observable outcomes that clinicians may notice:

• Unexplained radiolucent or radiopaque lines that do not correspond to anatomical structures.
• Reduced diagnostic confidence, prompting repeat exposures.
• Patient reports of discomfort or anxiety when asked to repeat an X‑ray.
• Increased radiation exposure due to multiple retakes.
• Misinterpretation leading to unnecessary treatment (e.g., root‑canal therapy for a false “lesion”).

When to See a Doctor

Artifacts themselves are not a medical emergency, but they can obscure real pathology. Seek professional evaluation if you notice any of the following after an X‑ray:

• You are repeatedly asked to repeat the same X‑ray without a clear reason.
• The radiologist reports “inconclusive” findings because of image quality.
• You develop new symptoms (pain, swelling, numbness) that were not visible on a previous clear image.
• There is a pattern of repeated artifacts despite proper technique, suggesting equipment malfunction.

Diagnosis

Diagnosing the source of xeroradiography artifacts involves a systematic assessment of both the imaging process and the equipment. Typical steps include:

1. Review of the Radiographic Technique

• Confirm exposure parameters (kV, mA, time) match the manufacturer's recommendations for the body part.
• Check patient positioning and immobilisation methods.
• Verify that the plate was handled with gloves and stored in a dry, dust‑free environment.

2. Equipment Inspection

• Visual inspection of the selenium plate for scratches, pits, or discoloration.
• Calibration of the X‑ray unit and development unit according to the service manual.
• Testing for electrostatic discharge using a portable ESD meter.

3. Quality‑Control (QC) Imaging

Most radiology departments run a daily QC phantom (e.g., a step‑wedge or line‑pair phantom). Comparing the phantom image to baseline standards can pinpoint whether the artifact is systemic or isolated to a particular patient exam.

4. Consultation with a Radiologist

The radiologist will assess whether the artifact interferes with diagnostic interpretation and may recommend repeat imaging using a different modality (e.g., digital intra‑oral sensor) if needed.

5. Documentation

All findings, including environmental conditions (temperature, humidity), are recorded in the patient’s file for future reference.

Treatment Options

Because the “treatment” pertains to image quality rather than a disease, interventions focus on correcting the cause and ensuring accurate diagnosis.

Medical/Professional Interventions

• Equipment Servicing – Replace or refurbish worn selenium plates, recalibrate exposure settings, and clean the development unit.
• Environmental Controls – Install HEPA filtration, control humidity (ideal 40–60 %), and limit ambient light in the radiography room.
• Staff Retraining – Conduct periodic competency assessments on proper plate handling, patient positioning, and exposure techniques.
• Alternative Imaging – Switch to digital radiography (CR or DR) when artifacts persist, as these systems are less prone to many of the listed causes.

Home or Patient‑Directed Actions

• Inform the technologist if you experience discomfort or have difficulty staying still during the exposure.
• Avoid wearing jewelry, metal dentures, or other objects that can cause scatter and artifact formation.
• Follow pre‑appointment instructions (e.g., refrain from eating or drinking excessively before a dental X‑ray) to reduce motion.

Prevention Tips

Reducing xeroradiography artifacts is primarily a matter of good practice and proper equipment maintenance. Below are actionable steps for both clinicians and patients.

• Use Protective Gloves – Always wear powder‑free nitrile gloves when handling plates.
• Maintain a Clean Environment – Keep the imaging room dust‑free; use lint‑free wipes to clean plates.
• Control Ambient Light – Dim the lights or use blackout curtains during exposure and development.
• Regular QC Checks – Perform daily phantom imaging and document results; address deviations immediately.
• Calibrate Exposure Settings – Follow the equipment’s “auto‑exposure” recommendations, and adjust only when a specific protocol demands it.
• Secure Patient Position – Use bite‑blocks, headrests, or stabilization devices to minimise motion.
• Replace Worn Plates – Most selenium plates have a lifespan of 2–3 years under regular use; track usage counts.
• Limit Re‑exposures – If an image is poor, pause, reassess technique, and only repeat after correcting the identified issue.
• Educate Patients – Explain the importance of staying still and removing metal objects before the exam.

Emergency Warning Signs

References

• Mayo Clinic. “Dental X‑rays: What to Expect.” mayoclinic.org. Accessed May 2026.
• U.S. Food & Drug Administration. “Radiology Devices – Quality Assurance.” fda.gov. 2023.
• American Dental Association. “Guidelines for Infection Control in Dental Radiography.” 2022.
• Cleveland Clinic. “Radiographic Imaging: Common Artifacts and How to Avoid Them.” clevelandclinic.org. 2024.
• World Health Organization. “Radiation Safety in Medical Imaging.” WHO Publication, 2021.
• National Institute of Biomedical Imaging and Bioengineering. “Quality Control in Dental Radiography.” NIH, 2020.