What are the quantities representing ct dosimetry index and their relationships?

CTDIvol: volume CT dose index CTDIvol is used to reflect the average slice dose in the whole spiral scanning volume. CTDIvol？ = CTDIW/CT pitch (factor), CTDIW reflects the average dose in the scanning plane of the sequence. DLP:DLP is used to evaluate subjects' exposure to ct radiation? Total radiation dose received after scanning. DLP=CTDIvol×L, CTDIvol is the volume CT dose index of multi-slice spiral CT scanning, and l is the scanning length along the z axis. When expressed from the perspective of comparable radiation biological damage, it is necessary to use the unit mSv. The relationship between mSv and DLP is MSV = DLP× k, and this k value is a coefficient.