Renal Doppler ultrasound is required in the diagnosis and diagnosis of kidney disease. There are many diseases related to kidney. Some are functional, diffuse and systematic. The use of Doppler imaging provides easy assessment of vascular changes. Doppler testing is widely used to assess renal artery perfusion. Doppler index; Used to estimate resistive index, pulsatility index, peak systolic renal artery blood flow. Doppler analysis provides useful clinical data that can predict early damage of renal tissue. In recent years, ultrasound elastography has shown advanced development. It is a promising new technology used to assess kidney tissue symptoms. Elastography is an effective imaging method for diagnosing kidney disease. In the future, doctors may use elastography instead of biopsy. In this chapter, we highlight the applications of Doppler ultrasound and elastography in the evaluation of various kidney diseases.
Doppler ultrasound is widely used in medical imaging. It is an application of diagnostic ultrasound used to estimate the speed and direction of blood flow. These measurements are based on the Doppler effect, which is used to measure changes in the frequency of reflections echoing from moving blood cells. In many cases, Doppler ultrasound replaces X-ray angiography. The most important advantage of Doppler ultrasound over other imaging methods is that it provides real-time estimation of blood flow.
The Doppler Renal Resistant Index (RRI) is the most common Doppler parameter (RRI) used to diagnose a variety of kidney diseases, such as rejection of a transplanted kidney, detection of renal artery stenosis in hypertensive patients, and evaluation of chronic kidney disease. CKD).
Ultrasound elastography is an advanced imaging technique that is sensitive to tissue stiffness. In recent years, elastography has been further developed to initiate quantitative assessment of tissue stiffness. Elastography can assess the altered elasticity of soft tissues as a result of specific pathological processes. It shows the difference between malignant and benign kidney mass that compensates for the need for biopsy. The combination of Doppler and elastography provides rich clinical data on disease processes associated with renal tissue required for management and treatment.
1 Ultrasound Examination Technique
The kidney is tested with ultrasound on longitudinal and transverse scan planes using 3.5 and 5 MHz transducers. ***** examined in conjunction with lateral decubitus. Various flights are then performed to display the entire kidney. Preferably, longitudinal and transverse planes are taken to determine the length and shape of the kidney.
The color Doppler (CD) converts the Doppler shift into a series of colors and creates an image of the blood vessels to display the velocity and direction of blood flow through the vessels. Doppler shift is the difference between the incident frequency and the reflected frequency. A positive Doppler shift occurs when the reflector moves away from the probe and a negative change occurs when the reflector moves toward the source of the ultrasound. Therefore, the Doppler shift is directly proportional to the speed of blood flow.
FD = 2F0vcos0CFD = 2F0vcos0C E1
Where F0: transmitted ultrasound frequency; V: is the reflector speed; C: sound speed; Cos 0: The cosine of the angle between the transmitted beam and the reflecting path.
Thanks for read my article.
You must be logged in to post a comment.