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Atlas of Human Body Ultrasound Scanning_ Methods and Diagnostic Applications ( PDFDrive ).pdf
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176

B. Su and Q. Yong

 

 

3.2\ Transverse scannng of the internal jugular vein

Fig. 7.35  Transverse section of the internal jugular vein

RIJV

RCCA

7  Vascular System Scanning

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3.2.1\ Scanning Method

The subject takes a supine position and stretches the head out slightly to make a full extension of the neck. The head holds the middle position or turns to the opposite side when one side of the internal jugular vein is examined. The probe is put in the lateral or post-lateral neck, after showing the longitudinal section of the IJV, rotates to vertical to long axial of the IJV to show the transverse section of the jugular vein.

3.2.2\ Sectional Structure

Transverse scanning at the level of the thyroid isthmus. The cross view of the internal jugular vein can be displayed by transverse scanning at the level of the thyroid isthmus, which is located at the lateral of the common carotid artery. The

jugular vein lumen can disappear when pressed by the probe. The venous valves of the proximal internal jugular vein can be seen by longitudinal scanning. The diameter of the internal carotid vein will increase when patients have a deep inspiration and breath-hold.

3.2.3\ Measurement Methods

The diameter of the internal jugular vein in cross section. Normal value is about 1.1 cm. There may be differences in the bilateral IJV in different cases can be measured.

3.2.4\ Clinical Significance

This plane can be used to diagnose dilation, thrombosis of the internal jugular vein, carotid arteriovenous fistula, and others.

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B. Su and Q. Yong

 

 

3.3\

Pulsed-Spectrum

 

of the Internal Jugular Vein

Fig. 7.36  Blood flow spectrum of the internal jugular vein

3.3.1\ Scanning Method

The subject takes a supine position, and the head is slightly stretched out to make a full extension of the neck. The head holds the middle position or turns to the opposite side when one side of the internal jugular vein is examined. The probe is placed on the lateral or post-lateral neck, and longitudinal scanning of the internal jugular vein is performed. Doppler sampling volume is placed in the center of the cavity of the internal jugular vein. It can also be placed in the brightest point of the color blood flow signal. The Doppler beam angle correction of θ line parallels to the beam flow line as far as possible; the angle should be no more than 60°.

3.3.2\ Sectional Structure

Longitudinal scanning of the internal jugular vein, which is located in the bilateral external

bilateral common carotid artery. The flow spectrum of the internal jugular vein appears in triphasic wave positive direction.

3.3.3\ Measurement Methods

The blood flow velocity of the internal jugular vein is measured in the spectrum.

3.3.4\ Clinical Significance

This plane can be used to diagnose dilation, stenosis, and thrombosis of the internal jugular vein as well as the arteriovenous fistula and others.

3.3.5\ Note

Pulse-Doppler shows the periodic flow spectrum of the internal jugular vein; spectrum peak flow speed is fast by deep inspiration and is slow down by deep breathing.

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3.4\ Longitudinal Scanning

of the Subclavian Vein

Fig. 7.37  Longitudinal view of the subclavian vein

3.4.1\ Scanning Method

The patient lies in a supine position and stretches the upper limb out .The scanning proximal segment of the left or right subclavian vein, right innominate artery, left innominate vein, and right innominate vein are performed at the root of the neck superior to the sternoclavicular joint or interior to the subclavian bone. The scanning can also be performed at the suprasternal fossa. The subclavian vein is anterior-interior to the subclavian artery and is difficult to be shown. If the image is not perfect, the 5 MHz low-frequency probe can be used to scan.

3.4.2\ Sectional Structure

Longitudinal view of subclavian vein. The wall of the upper limb vein pipe is thin, the inner

diameter is greater than that of the accompanying artery, and the transverse section of them is elliptical without pulsation. The lumen can be flat when pressed. The diameter of the vein can become enlarged when one’s breath is held after inspiration or Valsalva test.

3.4.3\ Measurement Methods

The inner diameter and blood flow spectrum of the subclavian vein can be measured.

3.4.4\ Clinical Significance

This section can be used to diagnose thrombus arteriovenous fistula of the subclavian vein and so on.