Abdominal aortic disease ultrasound
1.Abdominal aortic aneurysm (true, false) diagnosis and differential diagnosis. 2. Abdominal aortic dissection. 3. Detection of aortic plaques and thrombi in the abdominal aorta. 4. Multiple arteritis. 5. Diagnosis and differential diagnosis of abdominal aortic masses.
1. Subjects should be fasted or fasted for 4 to 8 hours after the inspection, if necessary, adequate water can fill the stomach cavity.
2. The conditional person should use color Doppler ultrasound imaging for two-dimensional ultrasound, color flow imaging and spectral Doppler examination.
(1) The probe frequency should be selected from 2.5 to 5.0 MHz.
(2) The smaller the angle θ between the blood flow and the sound beam, the better. The angle of theta should be taken when the diagnosis is made at <60 degrees.
(3) Wall filter, set as required.
(4) The sampling volume is placed at the center of the blood flow bundle or abnormal blood flow area.
(5) Generally, the color of the color Doppler flow imaging is set to red to indicate that the blood flow is up to the probe, and the blue indicates to the blood flow to go away from the probe.
3. The subject is usually in a supine position, supplemented by a left or right lateral decubitus examination if necessary.
4. Examination methods
(1) Two-dimensional ultrasound imaging
1 A probe is placed under the xiphoid process and a transverse section scan is performed to determine the position of the abdominal aorta.
2 The probe beam is aligned with the abdominal aorta from top to bottom or from bottom to top in a continuous cross-sectional scan. Cross-sectional observation starting point under the diaphragm, to the left and right common iliac artery bifurcation level, if necessary, increase the project, the common iliac artery into the scope of the scan.
3 The sound beam of the probe is aligned with the abdominal aorta, rotated 90 degrees to the longitudinal section of the abdominal aorta, and the starting point of the scan is the same as the transverse plane.
4 The vascular segment of the lesion area was scanned in multiple directions and multiple sections.
5 The routine examination of the abdominal aorta should focus on the proximal phrenic muscle, the origin of the superior mesenteric artery and the bifurcation of the left and right common iliac arteries.
(2) Color flow imaging 1 When the abdominal aortic sonogram is clearly displayed on a two-dimensional cross-section or longitudinal section, color flow imaging is performed. 2 Adjust the color development threshold, color gain, etc., in order to obtain maximum color sensitivity and no color background noise.
(3) Spectral Doppler examination
1 In the two-dimensional abdominal aorta or color flow channel, add spectral Doppler sampling line and sampling gate.
2 Adjust the coordinates of the blood flow curve so that it is slightly larger than the peak velocity of the blood vessel under test.
3 Carefully adjust the top, bottom, left, and right positions of the sampling door to obtain the maximum peak flow rate and make the spectrum curve more clearly displayed.
(1) Abdominal aortic diameter changes, with or without constricted enlargement, stenosis, and local compression, etc., were measured.
(2) Abdominal aortic lesion area wall thickness, intimal echo and smoothness, wall continuity and presence or absence of delamination.
(3) Abnormal echo in the abdominal aorta lumen (such as plaque, calcification echo, thrombosis, etc.).
(4) The running condition of the abdominal aorta.