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Construction of pediatric homogeneous phantoms for optimization of chest and skull radiographs
Allan Felipe Fattori Alves1, José Ricardo de Arruda Miranda2, Fernando Antonio Bacchim Neto2
1Instituto de Biociências de Botucatu, P.O. BOX 510, Departamento de Física e Biofísica, UNESP-Universidade Estadual Paulista, Distrito de Rubião Junior S/N, Botucatu, 18618-000 São Paulo, Brazil.
Insights
New pediatric phantoms (PCEP and PSEP) were developed for children aged 1-5 years. These phantoms establish Gold Standard (GS) computed radiography techniques, optimizing pediatric imaging and reducing costs.
Area of Science:
- Medical Imaging Physics
- Pediatric Radiology
- Radiographic Phantom Development
Background:
- Pediatric radiography requires specialized imaging techniques to ensure diagnostic accuracy and minimize radiation exposure.
- Existing imaging protocols may not be optimized for the unique anatomical and physiological characteristics of young children.
- Development of standardized phantoms is crucial for objective image quality assessment.
Purpose of the Study:
- To create pediatric patient-equivalent phantoms (PCEP and PSEP) for children aged 1-5 years.
- To determine Gold Standard (GS) computed radiography (CR) techniques for pediatric chest and skull imaging.
- To evaluate image quality using objective metrics for pediatric radiography.
Main Methods:
- Utilized an automatic computational algorithm to quantify biological tissue properties (lung, soft tissue, bone) for phantom material selection (Lucite, aluminum).
- Employed effective detective quantum efficiency and contrast-to-noise ratio as objective image quality metrics.
- Correlated phantom-based measurements with established data from standard adult patients.
Main Results:
- Established GS technique for pediatric chest radiography: 81kVp, 2.0mAs, with an entrance skin dose (ESD) of 83.6μGy.
- Established GS technique for pediatric skull radiography: 70kVp, 5mAs, with an ESD of 339μGy.
- Quantified image quality metrics for optimized pediatric imaging protocols.
Conclusions:
- Developed optimized pediatric radiography techniques through the use of PCEP and PSEP phantoms.
- Improved diagnostic image quality for pediatric patients while reducing institutional costs.
- Findings are transferable to diverse equipment technologies and clinical settings.
Objectives:
To develop two pediatric patient-equivalent phantoms, the Pediatric Chest Equivalent Patient (PCEP) and the Pediatric Skull Equivalent Patient (PSEP) for children aged 1 to 5 years. We also used both phantoms for image quality evaluations in computed radiography systems to determine Gold Standard (GS) techniques for pediatric patients.
Methods:
To determine the simulator materials thickness (Lucite and aluminum), we quantified biological tissues (lung, soft, and bone) using an automatic computational algorithm. To objectively establish image quality levels, two physical quantities were used: effective detective quantum efficiency and contrast-to-noise ratio. These quantities were associated to values obtained for standard patients from previous studies.
Results:
For chest radiographies, the GS technique applied was 81kVp, associated to 2.0mAs and 83.6μGy of entrance skin dose (ESD), while for skull radiographies, the GS technique was 70kVp, associated to 5mAs and 339μGy of ESD.
Conclusion:
This procedure allowed us to choose optimized techniques for pediatric protocols, thus improving quality of diagnosis for pediatric population and reducing diagnostic costs to our institution. These results could also be easily applied to other services with different equipment technologies.
