High-Frame-Rate Doppler Ultrasound Using a Repeated Transmit Sequence
| Autor: | Anthony Podkowa, Jeffrey A. Ketterling, Michael L. Oelze |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
color flow doppler
Acoustics high-frequency ultrasound plane-wave imaging Nyquist velocity multirate signal processing Plane wave lcsh:Technology 01 natural sciences Signal Standard deviation Article 030218 nuclear medicine & medical imaging lcsh:Chemistry Upsampling 03 medical and health sciences 0302 clinical medicine 0103 physical sciences General Materials Science lcsh:QH301-705.5 010301 acoustics Instrumentation Fluid Flow and Transfer Processes Physics lcsh:T Process Chemistry and Technology General Engineering Frame rate Scale factor lcsh:QC1-999 Computer Science Applications Transducer lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Ultrasonic sensor lcsh:Engineering (General). Civil engineering (General) lcsh:Physics |
| Zdroj: | Applied Sciences; Volume 8; Issue 2; Pages: 227 Applied sciences (Basel, Switzerland) Applied Sciences, Vol 8, Iss 2, p 227 (2018) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app8020227 |
| Popis: | The maximum detectable velocity of high-frame-rate color flow Doppler ultrasound is limited by the imaging frame rate when using coherent compounding techniques. Traditionally, high quality ultrasonic images are produced at a high frame rate via coherent compounding of steered plane wave reconstructions. However, this compounding operation results in an effective downsampling of the slow-time signal, thereby artificially reducing the frame rate. To alleviate this effect, a new transmit sequence is introduced where each transmit angle is repeated in succession. This transmit sequence allows for direct comparison between low resolution, pre-compounded frames at a short time interval in ways that are resistent to sidelobe motion. Use of this transmit sequence increases the maximum detectable velocity by a scale factor of the transmit sequence length. The performance of this new transmit sequence was evaluated using a rotating cylindrical phantom and compared with traditional methods using a 15-MHz linear array transducer. Axial velocity estimates were recorded for a range of ± 300 mm/s and compared to the known ground truth. Using these new techniques, the root mean square error was reduced from over 400 mm/s to below 50 mm/s in the high-velocity regime compared to traditional techniques. The standard deviation of the velocity estimate in the same velocity range was reduced from 250 mm/s to 30 mm/s. This result demonstrates the viability of the repeated transmit sequence methods in detecting and quantifying high-velocity flow. |
| Databáze: | OpenAIRE |
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