Spectral analysis of ureteral jets by color Doppler ultrasonography: A preliminary uretero-dynamic study

C. C. Wu, W. J. Yao, F. Lin, H. L. Hsieh, M. H. Hwang

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9 Citations (Scopus)


Background: Ureteral jets in the bladder can be easily detected using color Doppler ultrasound. This may be of value for the detection of obstructive uropathy. This study looks at the role of Doppler spectral analysis of ureteral jets and the uretero-dynamic observations in the evaluation of obstructive uropathy. Materials and Methods: Four symptomless volunteers and nine patients with urinary tract diseases were studied. The Doppler sample-volume cursor was placed at both ureteral orifices, from which urine was ejaculated into the bladder. Doppler shift waveforms were recorded and spectral analyses were carried out. Mean velocity, duration and frequency of ureteral jets were measured. Shape of the waveforms was also analysed. Results: With adequate hydration, the Doppler shift waveform normally had two or three peaks, of which the early peak (Vmax 1) was generally higher than the late peak (Vmax 2). The duration of jets was normally more than 4.5 seconds, the mean ejaculation velocity (Vmean) more than 20 cm/sec and the frequency 1/10-30 seconds. Of the 16 diseased urinary tracts, two (13%) had no jets throughout the observation and four (25%) had flattened types of jets without definite Vmax 1 and/or Vmax 2. There were seven (44%) with an ejaculation duration of less than 4.5 seconds, seven (44%) had a single peak, ie no Vmax 2, and nine (56%) had a Vmean of less than 20 cm/sec. In all, 13 (81%) of the 16 had one or more abnormal signs. Conclusion: Uretero-dynamic evaluation with the Doppler spectral analysis of ureteral jets may be a new way of evaluating obstructive uropathy. Furthermore, uretero-dynamics may provide important diagnostic information in various reno-urinary tract diseases.

Original languageEnglish
Pages (from-to)64-69
Number of pages6
JournalJournal of Medical Ultrasound
Issue number2
Publication statusPublished - 1995

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging


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