Which of the following is a non-invasive procedure that determines the pitch, rhythm, quality, and sound of the peripheral vascular system?

Doppler scanning and ultrasound is a non-invasive procedure specifically designed to evaluate the hemodynamics of blood flow within the peripheral vascular system. This technique uses high-frequency sound waves to produce images and assess the movement of blood, allowing for the determination of pitch (frequency shifts), rhythm, quality, and sound related to blood flow. It provides real-time information about blood vessel conditions, such as blockages or abnormal blood flow patterns.

In contrast, CT scans and MRIs are imaging techniques that, while useful for a variety of diagnostic purposes, do not provide the auditory assessment of blood flow dynamics. X-rays, primarily used for visualizing bone structures, do not assess vascular function or the characteristics of blood flow. Doppler ultrasound uniquely combines imaging with the ability to measure and analyze blood flow, making it the correct answer in this context.