Pediatric radiography is one of the most challenging and rewarding areas of radiologic technology. Children are not simply small adults — they differ in anatomy, physiology, emotional development, and radiation sensitivity. Every rad tech who works with pediatric patients must adapt their positioning techniques, exposure factors, immobilization methods, and communication style to the child's age, size, and developmental stage.
Children generally have greater lifetime radiation risk than adults for the same absorbed organ dose because many developing tissues are more radiosensitive and there is more time for a radiation-associated cancer to appear. Risk varies substantially by age at exposure, sex, organ and dose; a single “2–3×” multiplier is not valid for every child or examination. The goal is therefore an indicated, diagnostic examination optimized to the child's size and clinical question—not an image made at the lowest settings regardless of quality.
Beyond radiation concerns, you'll face unique positioning challenges: a squirming toddler cannot hold still for a chest X-ray the way an adult can; a frightened preschooler may refuse to enter the X-ray room; and a premature infant in the NICU requires a completely different approach than a school-age child. This guide covers everything you need to know to produce diagnostic-quality pediatric images while minimizing dose, reducing repeats, and providing compassionate care.
Successful pediatric radiography balances three competing priorities: (1) Diagnostic image quality — the image must answer the clinical question; (2) Radiation dose minimization — use the lowest exposure that produces a diagnostic image; and (3) Patient cooperation — a child who is calm and comfortable moves less, reducing the need for repeats. All three must be managed simultaneously. Neglecting any one corner leads to suboptimal outcomes.
Radiation risk is probabilistic and is not directly measurable in an individual patient. “Effective dose” is a population protection quantity, not an individual risk estimate, and published values for a pediatric chest examination vary with patient size, projections, field size and equipment. Quoting one universal dose can therefore mislead. Local diagnostic reference levels, entrance/kerma-area-product data when available, reject analysis and detector exposure indicators are better optimization tools.
Image Gently's digital-radiography guidance emphasizes the following:
Appropriate stabilization can prevent motion and repeats, but it must be necessary, proportionate, continuously supervised and consistent with manufacturer instructions and facility policy. A repeat adds another exposure; it does not necessarily “double dose” unless the repeated technique and field are identical. Never restrain across an injured area, compromise breathing or circulation, or leave a child unattended in a device.
Infants cannot follow instructions and have minimal voluntary movement control, but they also have predictable positioning needs. The most important tools for infant immobilization include:
This age group presents the greatest challenge. Toddlers are mobile, curious, and often fearful of the X-ray room. Key strategies include:
Most children in this age range can cooperate with instructions, but they may still be anxious or self-conscious. Strategies shift from physical immobilization to psychological preparation:
If your first attempt at a pediatric X-ray is unsuccessful (motion, wrong position, poor centering), stop and reassess before immediately repeating. Ask yourself: Is the child now more upset? Do I need a different immobilization method? Should I use a shorter exposure time? A different distraction? Firing off repeated exposures while a child is crying and thrashing is unsafe, ineffective, and increases dose. Take 30 seconds to change your approach before the second attempt.
Pediatric positioning requires modifications to standard adult projections. Here is a guide to the most common pediatric X-ray examinations with their specific positioning requirements.
Chest radiography should be tailored to the indication. It may be appropriate for suspected pneumonia or line/tube position, but it is not routinely indicated for uncomplicated bronchiolitis. Suspected foreign-body aspiration may require inspiratory/expiratory or bilateral decubitus images according to age and local protocol; routine “two-view” imaging should not be assumed for every indication.
Infants: AP supine imaging is common in the NICU or when an infant cannot be upright. Keep the detector immediately behind the thorax, avoid rotation, move the chin and arms clear when safe, and collimate to include both apices and costophrenic angles without routinely including the abdomen. Use visual chest rise to time a well-inspired image when possible. An upright AP or PA may be obtained in a suitable approved device.
Cooperative children: PA upright is preferred when feasible because it reduces cardiac magnification and anterior-organ dose relative to AP. Use the facility's chest SID and positioning protocol; a longer SID is commonly used but is not universally achievable on portable equipment. A lateral is obtained only when ordered/protocolled. Choose manual exposure or AEC from a validated pediatric chart—never select an AEC chamber by age alone, and confirm that the anatomy fully covers the selected chamber.
Abdominal radiography is useful for selected questions such as bowel obstruction, radiopaque foreign body or neonatal bowel disease, but is not automatically indicated for nonspecific pain or uncomplicated constipation. Confirm the requested projection(s) and clinical question.
Supine AP: Avoid rotation and collimate to the anatomy required by the indication. A full abdominal image generally includes the diaphragms through the pubic symphysis, but a neonatal chest/abdomen image for line placement or NEC follows a specific NICU protocol. Do not add a decubitus or cross-table lateral routinely; obtain it when free gas or another indication is being assessed under protocol. A left lateral decubitus uses a horizontal beam and adequate time in position when the child's condition allows.
Trauma-related extremity X-rays are extremely common in pediatric imaging. Growth plates (physes) are the most important anatomical consideration — they appear as radiolucent lines and must not be mistaken for fractures.
Key considerations for pediatric extremities:
| Examination | Technique basis | Grid decision | AEC | Positioning / field |
|---|---|---|---|---|
| Chest AP/PA | Measured thoracic thickness; validated chart; short exposure time | Usually no grid below 10–12 cm thickness | Only if anatomy covers a calibrated chamber | PA upright when feasible; apices through costophrenic angles |
| Abdomen AP | Measured abdominal thickness; indication-specific image quality | Usually no grid below 10–12 cm thickness | Only with validated pediatric setup and exact centering | Required abdominal boundaries; no automatic extra projection |
| Hand/wrist | Equipment-specific non-grid extremity chart | No grid for a typical pediatric distal extremity | Manual technique normally preferred | Dedicated projections on the general-radiography detector; never substitute an unapproved mammography receptor |
| Long bone | Thickness and body-part chart | Based on thickness/scatter | Manual technique commonly used | Include both adjacent joints; never force the injury |
| Pelvis/hip | Measured thickness and requested protocol | Based on 10–12 cm thickness guidance and local validation | Use only if chamber coverage is assured | Do not force internal rotation or frog-leg when trauma/SCFE is possible |
Table 1: Selection principles—not an exposure chart. Exact kVp, mA, time, SID, grid and EI targets must be established for each X-ray system, detector, projection, patient-thickness band and clinical task with radiologist/medical-physicist oversight.
Dose reduction in pediatric imaging requires an active, deliberate approach. Simply using "lowest settings" is not enough — every exposure factor must be optimized for the individual child.
Match technique to measured body-part thickness and the diagnostic task. Weight or age may be useful only when a validated local chart explicitly uses them; neither replaces thickness for projection radiography. Do not apply a universal “double mAs every 4–5 cm” rule: attenuation changes with kVp, tissue composition, grid, detector and examination. Use the chart developed for the specific room and review it with a qualified medical physicist.
A grid can improve contrast when scatter is substantial, but ordinarily requires more receptor exposure and therefore more patient exposure. Image Gently advises avoiding grids for body parts less than about 10–12 cm thick. This is a thickness guide, not an absolute cutoff: use a grid only when the equipment-specific protocol shows that its diagnostic benefit justifies the added exposure. Do not convert it to a 20 kg or age-six rule.
Precise collimation is arguably the most powerful dose-saving tool available. Tight collimation reduces the volume of irradiated tissue directly. It also reduces scatter radiation, improving image contrast. For every pediatric examination, collimate to the area of clinical interest before making the exposure. Do not routinely image beyond the anatomical boundaries — for example, a pediatric chest X-ray does not need to include the entire abdomen and pelvis.
Use a short exposure time sufficient to reduce motion while maintaining the selected mAs and equipment limits. There is no universal 10–20 ms target for every projection. Select an mA/time combination supported by the generator, tube loading and focal-spot requirements; “highest mA available” can select a larger focal spot or exceed a protocol limit. Do not increase mAs merely to shorten time.
The lowest kVp is not automatically the lowest-dose choice. Within a validated chart, adequate beam penetration with appropriately reduced mAs often lowers dose compared with a low-kVp/high-mAs exposure, while image contrast in digital systems is also governed by processing. AEC can be appropriate for a sufficiently large child when the anatomy fully covers the selected, calibrated chamber and positioning is exact; manual technique is safer when chamber coverage is uncertain. Review EI/DI after exposure for quality improvement, but never repeat solely to make EI “perfect” when the image is diagnostic.
Current US consensus guidance recommends discontinuing routine patient gonadal and fetal contact shielding in diagnostic X-ray imaging. The AAPM's original 2019 statement is now archived, but its conclusion is reflected in the multi-organizational CARES consensus endorsed by radiology and radiologic-technology organizations. Reasons include:
Follow applicable regulation and facility policy. If shielding is retained after a patient/guardian discussion under policy, it must not obscure required anatomy or cover an active AEC chamber. This guidance concerns patient contact shielding; protective apparel for a necessary holder or worker is a separate occupational/public-protection measure.
High-yield principles are: justify the examination; use a measured-thickness, equipment-specific chart; avoid grids below roughly 10–12 cm part thickness; collimate to the indication; use only necessary projections; select a short validated exposure; and prevent repeats through preparation and safe stabilization. Routine patient gonadal/fetal shielding is not recommended under current US consensus guidance.
Pregnancy questions must be handled privately, respectfully and without assumptions about age, gender identity, sexual activity or a parent's presence. Follow the facility's policy and applicable consent/confidentiality law. Screening is especially important before examinations that directly irradiate the abdomen or pelvis; it is not a reason to delay an urgent, clinically justified examination when delay would harm the patient.
Your communication approach directly affects image quality. A child who is calm and trusts you will be more cooperative, reducing the likelihood of motion on the image and the need for repeat exposures. Here is an age-based communication framework:
Communicate primarily with the parent or guardian. Explain what you will do step by step before doing it. Infants are sensitive to their parents' emotional state — if the parent is anxious, the baby will sense it. Speak calmly to the parent first, then interact with the baby in a gentle, soothing voice. Never leave an infant unattended on the X-ray table — even a newborn can roll off a narrow table.
Toddlers are at the peak of stranger anxiety and are just beginning to assert their independence. Use simple, concrete language. Avoid asking yes/no questions that invite refusal ("Can you lie down for me?"). Instead, use declarative statements with choices where possible: "It's time to take a picture of your arm. Do you want to sit on mommy's lap or on the table?" Offer a reward: "When you're done, you get a sticker!"
Preschoolers have active imaginations and may fear the X-ray equipment. Use medical play when appropriate and explain truthfully: “This camera takes a picture of your bones. You will not feel the X-ray, but moving your sore arm may feel uncomfortable, so tell me if you need me to stop.” A countdown can help if it matches the actual exposure sequence; avoid promising a sound the equipment may not make.
These children can understand detailed explanations but may be embarrassed about exposing body parts or about being seen in a medical setting. Provide honest, straightforward information. Explain what you need them to do and why: "I need you to hold your breath for this picture because if you breathe, the lungs will look blurry and the doctor won't be able to see if you have pneumonia." Respect their modesty — use gowns and drapes appropriately.
Adolescents should be treated more like adults. Explain the procedure directly to the patient, not just to the parent. Ask if they have questions. Ensure modesty and privacy — adolescents are particularly sensitive about physical exposure. If a parent is present, ask the adolescent if they prefer the parent to stay or step out for certain examinations (consistent with your facility's chaperone policy).
Here are step-by-step positioning instructions for the three most common pediatric radiographic examinations you will perform as a rad tech.
Portable radiography in the Neonatal Intensive Care Unit (NICU) and Pediatric Intensive Care Unit (PICU) demands special attention. These patients are often on ventilators, have multiple lines and tubes, and are medically fragile. Before every NICU/PICU portable examination:
Document what the medical record, regulation and facility policy require—for example, projections/exposures, repeat reason, pregnancy-screening result, a manual holder, unusual positioning and relevant communication. Do not claim that ARRT universally requires a narrative of every exposure, shield and cooperation level; documentation rules vary by jurisdiction and institution.
A skeletal survey for suspected physical abuse is a high-stakes, protocol-driven examination. The interpreting radiologist diagnoses imaging findings; the technologist must produce and correctly label a complete series without confronting the family or independently changing the protocol. Current ACR Appropriateness Criteria support a skeletal survey as initial imaging for a child 24 months or younger when there is concern for physical abuse; use in older children is selective.
Typical ACR–SPR survey components (confirm the current local copy):
Key technique considerations:
Maintain professional objectivity, preserve accurate identifiers/side markers and follow chain-of-custody and reporting policy where applicable. Do not disclose unverified findings. Reporting duties and who is a mandated reporter vary by jurisdiction and role; promptly follow local law and the facility's child-protection escalation pathway.
| Parameter | Adult | Pediatric | Why It Matters for ARRT |
|---|---|---|---|
| Grid use | Based on thickness, scatter and protocol | Avoid below about 10–12 cm part thickness | Thickness—not age or weight—drives the decision |
| Stabilization | Often coaching; supports may still be needed | Preparation, supports or an approved device may be needed | Use the least restrictive safe method |
| Exposure time | Short enough for motion and task | Shortest validated time consistent with tube/focal-spot limits | No universal millisecond threshold |
| Patient contact shielding | Routine gonadal/fetal shielding not recommended under current US consensus guidance | May obscure anatomy or affect AEC; holder PPE is separate | |
| Communication approach | Direct to patient | Parent + child (age-dependent) | Cooperation reduces repeats |
| AEC usage | Common when validated | Use only when anatomy covers the calibrated chamber | No fixed age cutoff; manual charts often suit small anatomy |
| Radiation risk | Varies by organ, sex and age | Generally greater lifetime risk at younger ages | No universal pediatric multiplier |
| kVp/mAs | Equipment-, thickness-, projection- and task-specific | Lowest kVp is not automatically lowest dose | |
Before every pediatric radiographic examination, mentally run through this checklist:
Try these ARRT-style multiple choice questions based on this article. Click an option to check your answer — correct answers turn green, wrong ones turn red.