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Nuclear Medicine Techniques in Pediatric Bone Imaging
1Department of Radiology, Boston Children's Hospital, Harvard Medical School, Boston, MA.
Insights
Pediatric bone scans require careful radiation dose management and age-specific techniques. Understanding normal variations and employing methods like PET imaging are crucial for diagnosing diverse pediatric bone conditions.
Area of Science:
- Pediatric Nuclear Medicine
- Diagnostic Imaging
- Radiopharmaceutical Dosimetry
Background:
- Minimizing radiation exposure in pediatric imaging is paramount.
- Pediatric bone imaging presents unique challenges in patient preparation, positioning, and supervision.
- Normal bone scan appearance varies significantly with age, requiring developmental stage expertise.
Purpose of the Study:
- To outline the essential considerations for performing and interpreting pediatric bone scans.
- To highlight the expanded applications of radionuclide bone imaging in children for benign conditions.
- To discuss the utility and challenges of various imaging modalities, including planar, SPECT, and PET.
Main Methods:
- Individualized selection of radiopharmaceutical dosage and imaging techniques.
- Utilizing patient preparation, parental engagement, gentle restraint, and sedation when necessary.
- Employing planar scintigraphy, SPECT, and 18F-sodium fluoride PET imaging.
Main Results:
- Pediatric bone imaging is vital for a broad spectrum of benign disorders, unlike adult imaging.
- Common indications include osteomyelitis, trauma, child abuse, growth disorders, and Langerhans cell histiocytosis.
- 18F-sodium fluoride PET offers high resolution for small structures, despite potential sedation needs.
Conclusions:
- Effective pediatric bone imaging necessitates meticulous attention to radiation safety and patient management.
- A thorough understanding of age-related normal variations is critical for accurate interpretation.
- Fluoride PET imaging shows significant promise for future pediatric bone assessments.
Abstract:
An important mandate when imaging pediatric patients is the reduction of radiation exposure to the lowest possible level consistent with good quality diagnostic imaging, so individual selection of radiopharmaceutical dosage and imaging technique is essential. Although the logistics of image acquisition and the approach to interpretation mirror the more common use in adults, the challenges of imaging young children typically require greater attention to patient preparation, positioning, and supervision during imaging, with the use of parental or family engagement in the procedure, gentle restraint, and occasionally the need for sedation. Because the normal bone scan appearance varies dramatically with age as osseous structures mature, it is critical that the interpreting physician be well versed in the range of normal variability at each developmental stage. Although routinely employed in the evaluation of malignancy, radionuclide bone imaging in children is used for a much wider range of benign disorders than it is typical in adults. In many pediatric nuclear medicine departments, the evaluation of benign bone disorders represents most imaging procedures. Common indications include the evaluation of sports injuries, osteomyelitis, trauma, including suspected child abuse, growth disorders, such as mandibular condyle asymmetry, and noninfectious processes such as Langerhans cell histiocytosis. Both planar scintigraphy and SPECT imaging are widely employed, although the SPECT acquisition time presents a barrier in some age groups, making shorter planar spot views desirable when feasible. PET bone imaging with 18F-sodium fluoride has been shown useful in a number of pediatric disorders, but may present issues in young children, as it can require the use of sedation. Despite this challenge, the higher resolution and resulting better anatomical depiction of bone anatomy by PET techniques can be very valuable in evaluating small structures, and current experience suggests a large future role for fluoride PET imaging.