Article Figures & Data
Figures
- Fig 1.
Intraoperative photograph of the dissected CCA of the dog. A, Sonographic flow probe around the CCA. B, Vascular tourniquet around the CCA.
- Fig 2.
3D surface rendering of the CCA created by QMRA. A: The CCA segment before stenosis is induced. The tourniquet is in place and loose. B: The same CCA segment after stenosis is created by tightening the tourniquet. The vertical arrow indicates the direction of flow. The white arrow indicates the position of the stenosis. The flow probe is proximal to the stenosis outside the FOV.
- Fig 3.
Correlations between mean, maximum, and minimum flow volume rates obtained with QMRA and those obtained with sonographic flow.
- Fig 4.
An example of simultaneous flow-volume measurements obtained with QMRA and the flow probe across time in an animal with no stenosis. The QMRA measurements closely track flow-probe measurements for maximum, mean, and minimum flow volumes. The QMRA method gives lower maxima and higher minima compared with the flow probe due to its reduced temporal resolution.
- Fig 5.
Bland-Altman plot shows the relative degree of agreement between volume flow measurements with QMRA and the invasive flow probe. Dashed lines demonstrate upper and lower limits of agreement. (±2 SDs).
- Fig 6.
Correlations of mean flow-volume rates between the flow probe and QMRA with no stenosis, proximal to the stenosis, and distal to the stenosis.
Tables
- Table 2:
Comparison of the PD between flow measurements from QMRA and the flow probe across the normal and stenotic CCA as a function of stenosis
Position PD (± SE) (%) No. of Measurements Average Flow (mL/min) No stenosis 4.8 ± 1 33 509 Stenosis 11.4 ± 1 27 86 Proximal to stenosis 9.6 ± 2 8 82 Distal to stenosis 12.2 ± 2 19 88
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