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Can diffusion tensor imaging unlock the secrets of the growth plate?
Ola Kvist1,2, Laura A Santos3, Francesca De Luca4,5
1Department of Paediatric Radiology, Karolinska University Hospital, Stockholm, 171 64, Sweden.
Insights
Diffusion Tensor Imaging (DTI) assesses bone growth plates using water diffusion patterns. This non-invasive technique provides quantitative data to evaluate growth plate normality and treatment effects.
Area of Science:
- Biomedical Imaging
- Skeletal Biology
- Radiology
Background:
- The growth plate is crucial for longitudinal bone growth in children.
- Assessing growth plate status is important for predicting height and monitoring treatment.
- Current methods may involve ionizing radiation or be invasive.
Purpose of the Study:
- To evaluate the utility of Diffusion Tensor Imaging (DTI) for assessing pediatric growth plates.
- To explore DTI metrics and tractography for quantitative and qualitative analysis of growth plate microstructure.
- To establish DTI as a non-invasive, radiation-free imaging modality for growth plate evaluation.
Main Methods:
- Diffusion Tensor Imaging (DTI) was used to visualize water diffusion within the growth plate.
- DTI metrics such as tract volume, length, number, fractional anisotropy (FA), and mean diffusivity were analyzed.
- Tractography was employed to provide a visual representation of diffusion direction and amplitude, reflecting cellular orientation.
Main Results:
- DTI successfully detected the columnar pattern of chondrocytes in the growth plate.
- Quantitative DTI metrics, particularly tract volume and FA, offer objective data on skeletal growth and growth plate normality.
- Tractography provided qualitative insights into growth plate activity and cellular orientation.
Conclusions:
- DTI and tractography offer a non-invasive and radiation-free method for assessing growth plates.
- These imaging techniques can provide quantitative and qualitative data relevant to skeletal growth and growth plate health.
- Future refinements in DTI may enhance predictions of growth and aid in evaluating treatment efficacy.
Abstract:
"How tall will I be?" Every paediatrician has been asked this during their career. The growth plate is the main site of longitudinal growth of the long bones. The chondrocytes in the growth plate have a columnar pattern detectable by diffusion tensor imaging (DTI). DTI shows the diffusion of water in a tissue and whether it is iso- or anisotropic. By detecting direction and magnitude of diffusion, DTI gives information about the microstructure of the tissue. DTI metrics include tract volume, length, and number, fractional anisotropy (FA), and mean diffusivity. DTI metrics, particularly tract volume, provide quantitative data regarding skeletal growth and, in conjunction with the fractional anisotropy, be used to determine whether a growth plate is normal. Tractography is a visual display of the diffusion, depicting its direction and amplitude. Tractography gives a more qualitative visualization of cellular orientation in a tissue and reflects the activity in the growth plate. These two components of DTI can be used to assess the growth plate without ionizing radiation or pain. Further refinements in DTI will improve prediction of post-imaging growth and growth plate closure, and assessment of the positive and negative effect of treatments like cis-retinoic acid and growth hormone administration.
