Research Topics
| P C LiSummaryAffiliation: National Taiwan University Country: Taiwan Publications
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Detail Information
Publications
An efficient speckle tracking algorithm for ultrasonic imagingPai Chi Li
Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan, ROC
Ultrason Imaging 24:215-28. 2002....- Pulse compression for finite amplitude distortion based harmonic imaging using coded waveformsP C Li
Department of Electrical Engineering, National Taiwan University, Taipei, R O C
Ultrason Imaging 21:1-16. 1999..In this paper, simulation examples of SNR improvements by up to 8.2 dB are shown and the efficacy of the compression schemes is studied. Potential sources of performance degradation are also discussed... - Time-intensity-based volumetric flow measurements: an in vitro studyPai Chi Li
Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
Ultrasound Med Biol 28:349-58. 2002..Potential applications of new volumetric flow estimation techniques based on both input and output intensities were also discussed... - Tissue motion and elevational speckle decorrelation in freehand 3D ultrasoundPai Chi Li
Department of Electrical Engineering, National Taiwan University, Tapei, ROC
Ultrason Imaging 24:1-12. 2002..Finally, full motion analysis in freehand scanning may not be possible by only using speckle correlation analysis unless speckle variations can be reduced and the correlation distribution under complex motion can be obtained... - Transfer function analysis of ultrasonic time-intensity measurementsPai Chi Li
Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
Ultrasound Med Biol 29:1493-500. 2003..The results from this paper lead to future work in brain-perfusion estimation based on extracranial time-intensity measurements... - Photoacoustic flow measurements by use of laser-induced shape transitions of gold nanorodsPai Chi Li
Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
Opt Lett 30:3341-3. 2005..Excellent agreement between the measured velocities and the actual velocities was demonstrated, with a linear regression correlation coefficient of 0.93. This study is a pioneer work on wash-in flow estimation in photoacoustic imaging... - Waveform design for ultrasonic pulse-inversion fundamental imagingPai Chi Li
Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
Ultrason Imaging 28:129-43. 2006..Therefore, a Gaussian pulse with the pulse length determined by the signal-to-noise ratio of the imaging system is generally optimal for PI fundamental imaging... - Subband photoacoustic imaging for contrast improvementPai Chi Li
Graduate Institute of Biomedical Electronics and Bioinformatics, Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
Opt Express 16:20215-26. 2008..Finally, a method to further enhance the contrast based on optimal weighting is also presented. The proposed method is of particular interest in photoacoustic molecular imaging... - In vivo photoacoustic molecular imaging with simultaneous multiple selective targeting using antibody-conjugated gold nanorodsPai Chi Li
Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei, Taiwan
Opt Express 16:18605-15. 2008..Both in vitro and in vivo mouse model imaging experiments were performed, with contrast enhancement of up to 10 dB and 3.5 dB, respectively. The potential in improving cancer diagnosis is demonstrated... - Strain compounding: a new approach for speckle reductionPai Chi Li
Department of Electrical Engineering, National Taiwan University, Taipei, ROC
IEEE Trans Ultrason Ferroelectr Freq Control 49:39-46. 2002..Performance limitations and fundamental differences between the proposed technique and existing techniques are discussed... - Strain compounding: spatial resolution and performance on human imagesP C Li
Department of Electrical Engineering, National Taiwan University, No 1, Sec 4, Roosevelt Road, Taipei 106, Taiwan
Ultrasound Med Biol 27:1535-41. 2001..Speckle reduction in liver imaging is also demonstrated. However, speckle reduction is not as significant as in thyroid imaging, due to the fact that a large compression cannot be achieved... - Effects of transmit focusing on finite amplitude distortion based second harmonic generationP C Li
Department of Electrical Engineering, National Taiwan University, Taipei, ROC
Ultrason Imaging 21:243-58. 1999..In other words, it is expected that dynamic transmit focusing can improve the SNR of finite amplitude distortion based second harmonic imaging while improving the contrast resolution over fundamental imaging... - On velocity estimation using speckle decorrelationP C Li
Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan, R O C
IEEE Trans Ultrason Ferroelectr Freq Control 48:1084-91. 2001..It is further shown that effects of signal-to-noise ratio (SNR) on the correlation must also be taken into account for quantitative flow analysis... - A dynamic focusing technique for delta-sigma-based beamformersP C Li
Department of Electrical Engineering, National Taiwan University, Tapei, ROC
Ultrason Imaging 22:197-205. 2000.... - Correlation-based correction of sound velocity inhomogeneities using delta-sigma modulatorsP C Li
Department of Electrical Engineering, National Taiwan University, Tapei, ROC
Ultrason Imaging 22:206-13. 2000..It is shown that the single bit dynamic focusing approach does not affect the overall performance of phase aberration correction... - Aperture-domain processing and its applications in ultrasound imaging: a reviewS L Wang
Department of Electrical Engineering, National Taiwan University, Taipei, People s Republic of China
Proc Inst Mech Eng H 224:143-54. 2010..18 per cent and 18.11 per cent in the axial and lateral velocity components, respectively. Other applications in which aperture-domain data can be used are also discussed... - Feasibility study of time-intensity-based blood flow measurements using deconvolutionC K Yeh
Department of Electrical Engineering, National Taiwan University, Taipei, ROC
Ultrason Imaging 23:90-105. 2001..Nonetheless, the indicator-dilution theory can still be applied if only relative measurements of the flow rate are required... - Filter-based synthetic transmit and receive focusingM L Li
Department of Electrical Engineering, National Taiwan University, Tapei, ROC
Ultrason Imaging 23:73-89. 2001..Nonetheless, system complexity is greatly reduced with synthetic transmit and receive focusing because the dynamic receive focusing circuit is no longer needed... - Harmonic leakage and image quality degradation in tissue harmonic imagingC C Shen
Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
IEEE Trans Ultrason Ferroelectr Freq Control 48:728-36. 2001..The filtering technique was also compared with the pulse inversion technique. It was shown that the pulse inversion technique effectively suppresses harmonic leakage at the cost of imaging frame rate and potential motion artifacts... - Optoacoustic imaging with synthetic aperture focusing and coherence weightingC K Liao
Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
Opt Lett 29:2506-8. 2004..The results show that the proposed technique improved lateral resolution by 400-800% and the signal-to-noise ratio by 7-23 dB over conventional techniques... - Elastic properties of tendon measured by two different approachesP L Kuo
Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital, Taipei, Taiwan
Ultrasound Med Biol 27:1275-84. 2001..However, a significant discrepancy existed between the two approaches. The discrepancy was primarily due to viscoelasticity associated with the first approach... - Tissue harmonic image analysis based on spatial covarianceC C Shen
Department of Electrical Engineering, National Taiwan University, Taipei, ROC
IEEE Trans Ultrason Ferroelectr Freq Control 48:1648-56. 2001..It is concluded that the linear signal is more suitable for correlation-based correction of sound velocity inhomogeneities, despite the fact that tissue harmonic imaging generally has improved image quality over linear imaging... 
Intracavernosal pressure characteristics analyzed by power spectral density for identifying the phase of penile erectionW R Han
Institute of Biomedical Engineering, National Yang Ming University, Taipei, Taiwan
Int J Impot Res 21:336-42. 2009..75. The described novel objective and low-invasiveness method can therefore be used for identifying the full and rigid erection phases of the penis in urological investigations during different erection phases...