A novel method mitigating the Lidar performance in fog is presented. It employs a median filter to extract the laser pulses buried in the backscattering returns. Simulation results demonstrate the efficiency of the pr...
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We have built upon an existing freehand3d ultrasound imaging technique to enable display-less scanning at a local site by novice users and remote reading by integrating an electromagnetic tracker with a 2d probe. Sev...
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ISBN:
(数字)9781510649460
ISBN:
(纸本)9781510649460;9781510649453
We have built upon an existing freehand3d ultrasound imaging technique to enable display-less scanning at a local site by novice users and remote reading by integrating an electromagnetic tracker with a 2d probe. Seventy-two volumes are generated using a reconstruction algorithm from data collected by three users in a single longitudinal sweep across a 23week fetus phantom in four different configurations for six scan durations ranging from 5-s to 30-s. The acquisition is semi-blinded: the user knows the fetal orientation but scans without imagedisplay and guidance of a conventional scan. Three non-expert readers and one expert Radiologist extract the clinically relevant planes and measure four key biometric features from the 3dimages. In this paper, we propose (1) a risk metric R to rate the quality of the scan as a function of probe motion and contact and (2) a measurability index M for the availability of the 2d planes within the volume and visibility of the biometric features. Our analysis shows that R is the lowest and M the highest for 15-s acquisitions corresponding to an average transducer sweep speed of 2.4-cm/s. The finding is consistent with a reported speed range of 3-4 cm/s recommended for a low cost teleradiology solution for 2d ultrasound. The errors in average biometric measurements compared to the 50th percentile values in the fetal biometry tables for corresponding gestational week are within -3.8 to 5.7%. R, M, accuracy and precision of measurements are useful indicators of performance of the 3d ultrasound system.
We present a common-path digital holographic microscope (dHM) using a Fresnel biprism suitable for spatially dense samples. The performance of the dHM system for dense samples has been validated calibrated phase image...
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Magnetic resonance imaging (MRI) and photoacoustic tomography (PAT) offer two distinct image contrasts. To integrate these two modalities, we present a comprehensive hardware-software solution for the successive acqui...
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Magnetic resonance imaging (MRI) and photoacoustic tomography (PAT) offer two distinct image contrasts. To integrate these two modalities, we present a comprehensive hardware-software solution for the successive acquisition and co-registration of PAT and MRI images in in vivo animal studies. Based on commercial PAT and MRI scanners, our solution includes a 3d-printeddual-modality imaging bed, a 3-d spatial image co-registration algorithm with dual-modality markers, and a robust modality switching protocol for in vivo imaging studies. Using the proposed solution, we successfully demonstrated co-registered hybrid-contrast PAT-MRI imaging that simultaneously displays multi-scale anatomical, functional and molecular characteristics on healthy and cancerous living mice. Week-long longitudinal dual-modality imaging of tumor development reveals information on size, border, vascular pattern, blood oxygenation, and molecular probe metabolism of the tumor microenvironment at the same time. The proposed methodology holds promise for a wide range of pre-clinical research applications that benefit from the PAT-MRI dual-modality image contrast.
We overview the performance comparison of spatio-temporal continuous gesture recognition under degraded environments using 3d Integral imaging (InIm) and RGB-d sensors. The overviewed3d Integral imaging-based approac...
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This paper presents a paradigm shift in endoscopy using coherent fiber bundles (CFB). The memory effect of CFB is exploited towards 3d endoscopy using printeddiffractive optical elements (dOE) anddeep neural network...
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We present an algorithm to generate 2d arrays of random numbers as digital holograms to be used as optical information carriers to realize high-fidelity optical data transmission through scattering media in free space...
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