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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | de Ana, F.J. O'Donnell, M. |
| Copyright Year | 2005 |
| Description | Author affiliation: Dept. of Biomed. Eng., Michigan Univ., Ann Arbor, MI, USA (de Ana, F.J.; O'Donnell, M.) |
| Abstract | Previously, we presented the flow estimation error introduced by in-plane flow using a slow-time FIR (finite impulse response) filter-bank method to measure quantitatively blood flow decorrelation through the image plane of an intravascular ultrasound (IVUS) imaging system. There exists a monotonic relationship between blood flow velocity and the normalized second moment of the slow-time spectrum for flow orthogonal to the imaging plane of a side-looking catheter array However, in the presence of an in-plane flow component, this monotonic relationship changes due to a shift and spread of slow-time spectra. These two effects cause the normalized second moment to increase, resulting in flow overestimates. By applying appropriate tilts to slow-time signals, however, the slow-time spectrum shifts back to DC and the orthogonal estimation method can be used. We present a method to correct this overestimation and estimate accurately blood flow through the image plane in real-time. Independent simulations show that, for blood flowing at angles between /spl plusmn/6/spl deg/ and /spl plusmn/15/spl deg/ at a speed of 30 cm/sec, flow would be overestimated by as much as 14.82% and 72.24% respectively using the direct filter-bank approach. However, this overestimation error can be corrected using the modified method presented, reducing the estimation error by a factor of 28.9 and 34.64 for those angles, respectively. |
| Starting Page | 580 |
| Ending Page | 583 |
| File Size | 625358 |
| Page Count | 4 |
| File Format | |
| ISBN | 0780384121 |
| ISSN | 10510117 |
| DOI | 10.1109/ULTSYM.2004.1417792 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2004-08-23 |
| Publisher Place | Canada |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Blood flow Estimation error Ultrasonic imaging Finite impulse response filter Decorrelation Ultrasonic transducers Fluid flow measurement Ultrasonic variables measurement Catheters Frequency |
| Content Type | Text |
| Resource Type | Article |
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