Final answer:
The false statement about color Doppler is that it is a reliable method for measuring peak systolic and end-diastolic velocities, as spectral Doppler is preferred for precise measurements. Aliasing and range resolution do occur in color Doppler, while autocorrelation methods are used for accurate Doppler frequency shift measurements.
Step-by-step explanation:
The statement that is NOT true concerning color Doppler is: 'Color Doppler is a reliable method to measure the peak systolic and end-diastolic velocities.' While color Doppler can give a visual representation of blood flow speeds and direction, it is not the most accurate method for measuring exact peak systolic and end-diastolic velocities. For accurate measurement of these velocities, spectral Doppler is used instead, as it provides a more accurate graphical representation of blood flow velocities over time.
Aliasing may occur with color Doppler when the frequency shift exceeds the Nyquist limit, which is half the pulse repetition frequency. This makes it appear as if the blood flow is moving in the opposite direction. Improved accuracy in measuring the Doppler frequency shift is achieved through techniques like autocorrelation. Additionally, range resolution, which is the ability to distinguish between two separate structures at different depths, does exist with color Doppler imaging.