Final answer:
Echocardiographic ventricular volumes are variable and depend on the method used to measure them, as compared to angiographic volumes which are considered the gold standard. Angiographic volumes are obtained through X-rays and contrast dye, while echocardiographic volumes are measured using ultrasound technology.
Step-by-step explanation:
Echocardiographic ventricular volumes can be variable, depending on the method used to determine them. Comparing echocardiographic volumes with angiographic volumes, we can see that angiographic volumes are commonly considered the gold standard for measuring ventricular volumes.
Angiographic volumes are obtained by injecting a contrast dye into the heart's blood vessels and taking X-ray images. On the other hand, echocardiographic volumes are measured using ultrasound technology, which has the advantage of being non-invasive but may have some limitations in accuracy compared to angiography.
Therefore, the correct answer to the question is D. Variable, depending on the method used to determine echocardiographic volume.