Doppler Resistance Index Calculator

Calculate Doppler Resistance Index (RI)



Formula

The formula to calculate the Doppler Resistance Index (RI) is:

\[ \text{RI} = \frac{\text{PSV} - \text{EDV}}{\text{PSV}} \]

Where:

Definition

Example

Let's say the Peak Systolic Velocity (PSV) is 120 cm/s and the End Diastolic Velocity (EDV) is 40 cm/s. Using the formula:

\[ \text{RI} = \frac{120 - 40}{120} = \frac{80}{120} \approx 0.67 \]

So, the Doppler Resistance Index is approximately 0.67.

Extended information about "Doppler-Resistance-Index-Calculator"

Resistive Index in Doppler

Definition: The resistive index (RI) is a measure used in Doppler ultrasound to assess the resistance to blood flow in vessels.

Formula: \( RI = \frac{PSV - EDV}{PSV} \)

Example: \( RI = \frac{120 - 40}{120} \)

Indice de Résistance Doppler

Definition: L'indice de résistance (IR) est une mesure utilisée en échographie Doppler pour évaluer la résistance au flux sanguin dans les vaisseaux.

Formula: \( IR = \frac{VSM - VDF}{VSM} \)

Example: \( IR = \frac{150 - 50}{150} \)

Doppler Velocity Index Calculator

Definition: The Doppler Velocity Index (DVI) is used to assess the function of aortic prosthetic valves and screen for valve obstruction.

Formula: \( DVI = \frac{LVOT_{velocity}}{AV_{velocity}} \)

Example: \( DVI = \frac{1.2}{4.0} \)

Formula Indice de Resistencia Doppler

Definition: El índice de resistencia (IR) es una medida utilizada en ecografía Doppler para evaluar la resistencia al flujo sanguíneo en los vasos.

Formula: \( IR = \frac{VSM - VDF}{VSM} \)

Example: \( IR = \frac{130 - 60}{130} \)

CP Ratio Doppler Calculator

Definition: The Cerebroplacental Ratio (CPR) is an obstetric ultrasound tool used to predict adverse pregnancy outcomes.

Formula: \( CPR = \frac{MCA_{PI}}{UA_{PI}} \)

Example: \( CPR = \frac{1.5}{0.8} \)

Resistive Index Renal Artery Doppler

Definition: The renal arterial resistive index (RI) is a sonographic index of intrarenal arteries used to assess renal function.

Formula: \( RI = \frac{PSV - EDV}{PSV} \)

Example: \( RI = \frac{100 - 30}{100} \)

Relativistic Doppler Effect Calculator

Definition: The relativistic Doppler effect describes the change in frequency or wavelength of light due to the relative motion of the source and observer at relativistic speeds.

Formula: \( f' = f \sqrt{\frac{1 + \frac{v}{c}}{1 - \frac{v}{c}}} \)

Example: \( f' = 500 \sqrt{\frac{1 + \frac{0.1}{1}}{1 - \frac{0.1}{1}}} \)

Doppler Velocity Index vs Dimensionless Index

Definition: The Doppler Velocity Index (DVI) and Dimensionless Index (DI) are used to assess aortic stenosis severity.

Formula: \( DI = \frac{LVOT_{VTI}}{AV_{VTI}} \)

Example: \( DI = \frac{20}{80} \)