| 摘要 |
The difference in time that it takes for blood to flow to two locations in a patient's body can be measured by placing, on the patient's body, sensors for non-invasively detecting a variable characteristic of the content of the blood at each of those locations. The time of occurrence of a change in that characteristic as detected by one of the sensors is compared to the time of occurrence of that same change as detected by the other sensor. The difference between these two times is a measure of the difference in time that it takes for blood to flow to the locations of the two sensors. |
