# DICOM Standard Browser

Built with by Innolitics, a team of medical imaging software developers.

Data synced with official DICOM standard on 18 April 2024. The DICOM Standard is under continuous maintenance, and the current official version is available at http://www.dicomstandard.org/current/. DICOM Parts 3, 4, and 6, © NEMA. Please note that the most recent PDF version of the standard is the official reference, and should checked when making technical decisions.

## B-scan Cycle Time Vector Attribute

Tag (0022,1646) Conditionally Required (1C) BscanCycleTimeVector 1-n Single (FL)

An array that contains the real time increments (in msec) between B-scans. See Section C.8.17.16.1.1 for further explanation.

Required if B-scan Cycle Time (0022,1645) is absent.

### Note

scan time + latency between B-scans

## Section C.8.17.16.1.1

###### C.8.17.16.1.1 B-scan Cycle Time and B-scan Cycle Time Vector

The B-scan Cycle Time (0022,1645) is the nominal scan time (in milliseconds) plus the latency between the individual repeats of the B-scan at the same location. The B-scan Cycle Time Vector can be used if the time for the repeats are not uniform. Either the B-scan Cycle Time (0022,1645) or the B-scan Cycle Time Vector (0022,1646) are required.

B-scan Cycle Time shall be used in the following manner to calculate 'the relative time' for each B-scan:

• B-scan Cycle 'Relative Time' (n) = B-scan Cycle Delay + B-scan Cycle Time * (n-1)

where:

• n = number of B-scan cycles within the frame and the first B-scan number is one

### Note

When there is only one B-scan present, B-scan Cycle Time (0022,1645) may have either a value of 0, or a nominal value that would apply if there were multiple B-scans.

B-scan Cycle Time Vector (0022,1646) is an array that contains the time increments (in milliseconds) between the nth B-scan cycle and the previous B-scan cycle for a frame. The first B-scan cycle always has a time increment of 0. The B-scan Cycle Time Vector shall be used in the following manner to calculate 'relative time' T(n)for B-scan Cycle n:

where Δti is the ith B-scan Cycle Time Vector component.