Dicom Image Scan Time

The Dicom tags of image scan time typically used are:

0008,0020: Study date;        0008,0030: Study time
0008,0021: Series date;      0008,0031: Series time
0008,0022: Acquis date;      0008,0032: Acquis time
0008,0023: Image date;       0008,0033: Image time

where Image date and time also called Content date and time.

Study date and time are generally used as the beginning of the radiologist starting to work on the scanner for the particular patient.

Series date and time/Acquisition date and time are kind of similar, logically series date and time are the starting point of a series image or in another word, the image volume. That is, they are different between volumes. However, because some volumes are secondary image derived from primary images, there could be different Series data and time of volumes shared the same Acquisition date and time.

Image date and time(Content  date and time) is the starting point of each single image slice.