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Indications for radiography

Radiography is one of the basic diagnostic imaging modalities that requires strict indications due to the risk of radiation exposure. Ordering examinations involving ionizing radiation is justified only when the imaging results can fundamentally alter patient management.

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Key RuleOrder only when the result influences management strategy.
Limb injuriesThe basic study is radiography in two standard projections.
AdditionalOblique projections are needed when in doubt or to visualize complex areas.
Pediatric patientsA radiograph of the healthy limb is often required for comparison due to growth plates.
Dose trackingSpecial software tracks the lifetime cumulative radiation dose.
3 min readFor medical studentsUpdated 10.10.2026
Material prepared by WhiteCoat Pro editorial team based on platform study guidesPending instructor review

Indication principles and radiation dose management

Repeated CT examinations and radiography increase the risk of exceeding the acceptable effective lifetime radiation dose, which may lead to radiation-induced malignancies. Dose management is a multidisciplinary process involving physicians, radiologic technologists, and medical physicists.

The physician must:

  • Limit the use of ionizing radiation to situations where it will alter management (change management).
  • Inform patients about the risks.
  • Ensure diagnostic quality at the lowest possible dose.

Software is used for monitoring, which tracks the cumulative radiation load (from CT, conventional radiography, nuclear medicine) of a specific patient in real time.

Methods for reducing radiation dose

Several strategies are used in clinical practice to minimize harm from imaging modalities:

  1. Strict justification: Ordering only when clearly indicated.
  2. Alternatives: Prioritizing non-radiation modalities (ultrasound, MRI) whenever possible.
  3. Low-dose protocols: Utilizing low dose CT algorithms, automatic tube current modulation, and iterative reconstruction.
  4. Dose tracking: Careful monitoring in patients with chronic conditions (e.g., inflammatory bowel disease).
  5. Adherence to standards: Compliance with current international guidelines.
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Examples of indications in traumatology

When a fracture of the distal radius or proximal forearm bones is suspected, the baseline diagnostic study is radiography in two standard projections.

Goals of the examination:

  • Confirm the fracture and assess the degree of fragment displacement.
  • Identify fracture-dislocations and injuries at other levels.

If findings are inconclusive, radiographs in oblique projections are ordered (e.g., for better visualization of the radial head). In high-energy trauma, adjacent segments of the radial and ulnar diaphyses and the hand are examined. In pediatrics, due to the presence of ossification centers, comparative views of the contralateral (healthy) joint are mandatory.

Diagnostic imaging in other fields

Radiography is used not only in traumatology. For example, lateral radiography of the thoracic and lumbar spine is indicated to identify causes of secondary osteoporosis, select medication, and monitor condition. If necessary, the examination is supplemented by spinal CT or MRI as indicated.

After confirmation of diagnoses (especially fractures requiring surgery), the patient is subject to hospitalization. In case of refusal of inpatient treatment, the patient or legal guardian must confirm the refusal with a personal signature in the medical record.

Class and exam questions

In which projections is baseline radiography performed for joint injuries?

In two standard projections. In case of doubtful findings, oblique projections or comparative views of the healthy limb are ordered.

Why is it necessary to image the healthy limb in children?

Children have ossification centers (bone growth plates) that can be mistaken for a fracture on a radiograph. Comparison with the healthy side rules out this error.

What is dose management software?

These are big data-based systems that instantly evaluate the patient's current and cumulative lifetime radiation dose from all radiological procedures.

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What else to study on this topic

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