Tag | (0054,0061) |
---|---|
Type | Conditionally Required (1C) |
Keyword | NumberOfRRIntervals |
Value Multiplicity | 1 |
Value Representation | Unsigned Short (US) |
Example Values |
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Number of R-R intervals. Required if the value of Frame Increment Pointer (0028,0009) includes the Tag for R-R Interval Vector (0054,0060). See Section C.8.4.8.1.6 for specialization.
Number of R-R Intervals (0054,0061) is the number of ranges of heartbeat durations collected. A gated acquisition may employ one R-R Interval to collect data from normal beats, a second R-R Interval to collect data from ectopic beats, and possibly others. Each R-R Interval accepts beats whose duration is greater than its Low R-R Value (0018,1081) and shorter than its High R-R Value (0018,1082). Beats that do not fall within these ranges may be accepted by another R-R Interval, or may be rejected.
The Number of R-R Intervals (0054,0061) is the total number of such ranges.
R-R Interval Vector (0054,0060) is an indexing vector. The value of the nth element of this vector is the interval number of the nth frame in this image, and shall have a value from 1 to Number of R-R Intervals (0054,0061).