Question

The weighted CTDIw can be converted into CTDIvol that is useful for estimating patient dose during helical acquisitions by dividing the CTDIw by the

Answer 1

The weighted CTDIw can be converted into CTDIvol by dividing the CTDIw by the pitch factor.

Step-by-step explanation:

The weighted CTDIw (Computed Tomography Dose Index weighted) is a measure of the average radiation dose delivered to a specific phantom during a CT scan. It takes into account the different radiation doses received from the various scan parameters around the patient's body. To convert the weighted CTDIw into CTDIvol (Computed Tomography Dose Index volume), you divide the CTDIw by the pitch factor.

The pitch factor is a value that represents how fast the patient table moves during a helical CT acquisition. It determines the spacing between the scan slices. The CTDIvol takes into account this spacing, which allows for a more accurate estimation of the patient's dose during a helical acquisition.

For example, if the CTDIw is 20 mGy and the pitch factor is 1.5, the CTDIvol would be 20 mGy / 1.5 = 13.33 mGy.

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