Effects of swept scanning on velocity estimation

Geng Shi Jeng*, Pai Chi Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The swept-scan technique adopted in high-frequency ultrasound involves mechanically scanning a single-element transducer to acquire image data. Unlike conventional step scanning, where the image data are acquired at discrete positions, the swept-scan technique acquires the image data while the transducer is continuously moving. Such a scanning method is particularly advantageous for Doppler flow estimation because its frame rate is higher than that for the step-scan technique. However, the effects of the transducer motion on the accuracy of velocity estimation have not been studied comprehensively. This study employed a κ-space approach to experimentally investigate the effects of swept scanning on both conventional Doppler axial velocity estimation and spectral-broadening-based lateral velocity estimation using a 45-MHz transducer. The results indicate that such effects must be corrected in order to obtain an accurate estimation of flow velocities.

Original languageEnglish
Pages (from-to)1-20
Number of pages20
JournalUltrasonic Imaging
Issue number1
StatePublished - Jan 2005


  • Doppler flow estimation
  • High-frequency ultrasound
  • Swept scanning
  • Vector velocity estimation
  • κ-Space

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