Sensitivity Laplacian Ratio‑Based Optimization of the Projection Selection for Diffuse Optical Tomography
Publish place: Journal of medical signals and sensors، Vol: 10، Issue: 2
Publish Year: 1399
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JMSI-10-2_007
تاریخ نمایه سازی: 28 تیر 1402
Abstract:
Background: In diffuse optical tomography, determining the optimal angle between the source and
detector is an effective method to reduce the number of projections while maintaining the quality of
the reconstructed images. In this study, a new parameter is introduced to evaluate the source‑detector
geometries. Methods: A two‑dimensional mesh with the radius of ۲۰ mm and ۷۹۸۷ nodes were
built. In each reconstruction, ۰.۵ mm heterogeneity with the absorption coefficient of ۰.۰۶ mm−۱
and the dispersion coefficient of ۰.۶ mm−۱ was added in different parts of the sample randomly. The
relationship between the mean square error (MSE), sensitivity Laplacian ratio (SLR), and sensitivity
standard deviation ratio (SSR) was evaluated based on their correlation coefficients. The quality of
the images achieved using the optimized projections were compared with that of the full projections
for the same depths. Results: MSE decreases by increasing the SLR magnitudes which indicate that
the parameter could be used to evaluate the scanning geometries. There was a negative correlation
coefficient (R = −۰.۷۶) with the inverse relationship between the SLR and MSE indices. SSR does
not have a significant relationship with the quality of the reconstructed images. For each scanning
depth, the comparison of the images obtained using the full and optimized‑selective projections did
not show any considerable difference despite the decrease of the projection numbers in scanning
geometry with the optimized‑selective projections. Conclusion: The unnecessary projections could
be eliminated by placing the detectors at the specific angles, which were determined using the SLR.
Thus, a proper compromise between the quality of the reconstructed images and reconstruction time
might establish.
Keywords:
Diffuse optical tomography , geometry optimization , sensitivity Laplacian ratio , sensitivity standard deviation ratio , source‑detector angle
Authors
Anita Ebrahimpour
Department of Medical Physics and Biomedical Engineering, Faculty of Medicine, Tehran University of Medical Sciences, Tehran
Seyed Salman Zakariaee
Department of Medical Physics, Faculty of Paramedical Sciences, Ilam University of Medical Sciences, Ilam, Iran
Marjaneh Hejazi
Department of Medical Physics and Biomedical Engineering, Faculty of Medicine, Tehran University of Medical Sciences, Tehran