Improving Visualization of Osteochondritis Dissecans Using Delay-Multiply-and-Sum Reconstruction.
Philip M Holmes1, Kun-Hui Chen2, Hyoung-Ki Lee3
1Mayo Clinic Graduate School of Biomedical Sciences, Rochester, MN, USA.
Ultrasound in Medicine & Biology
|June 25, 2023
Summary
Delay-multiply-and-sum (DMAS) ultrasound reconstruction significantly enhances the visualization of osteochondritis dissecans (OCD) capitellum lesions in athletes. This improved imaging aids in earlier and more accurate diagnosis of this common joint defect.
Area of Science:
- Orthopedics
- Medical Imaging
- Biomedical Engineering
Background:
- Osteochondritis dissecans (OCD) of the capitellum is a prevalent joint defect in adolescent athletes.
- Early diagnosis of OCD is crucial for effective treatment and spontaneous healing.
- Current ultrasound methods using delay-and-sum (DAS) reconstruction have limitations in visualizing OCD lesions.
Purpose of the Study:
- To evaluate the efficacy of conventional delay-multiply-and-sum (DMAS) and novel low-pass DMAS reconstruction algorithms for improved medical ultrasound visualization of OCD lesions.
- To compare the performance of DMAS algorithms against conventional DAS reconstruction in detecting OCD of the capitellum.
Main Methods:
- Development of phantom, cadaveric, and in vivo OCD models simulating various lesion severities.
- Application of histogram-matched conventional DMAS and low-pass DMAS reconstruction algorithms.
- Quantitative analysis of lesion contrast, cartilage contrast, crack thickness error, and bone interface clarity in reconstructed ultrasound images.
Main Results:
- Histogram-matched DMAS reconstruction improved lesion contrast by up to 16%, cartilage contrast by 26%, and bone interface clarity by 15% compared to DAS.
- Low-pass DMAS reconstruction further enhanced these metrics, improving lesion contrast by up to 22%, cartilage contrast by 45%, and bone interface clarity by 29%.
- In vivo imaging demonstrated significant improvements in lesion contrast with both conventional (22%) and low-pass (26%) DMAS reconstruction.
Conclusions:
- DMAS reconstruction algorithms, particularly the low-pass variant, offer superior visualization of OCD capitellum lesions compared to traditional DAS methods.
- Enhanced ultrasound imaging through DMAS can improve the detection and diagnosis of osteochondritis dissecans in athletes.
- These findings support the potential of DMAS as a valuable tool for screening and diagnosing OCD of the capitellum.
