The number of patients with normal NECT was thus reduced to 701.
The 23 cases with abnormal findings undiagnosed on the NECT were re-evaluated by the three reviewers during the consensus meeting.
Abnormalities detected on CECT that were not detected by the NECT are summarised in Table 2.
28% (23 out of 701 cases) of normal NECT of the brain.
In some cases, a reviewer reported the NECT study as abnormal, but after the administration of contrast media reported it as normal.
Undiagnosed findings on NECT may be attributed to several factors.
NECT and CECT were read at different times in order to reduce a possible bias being created by reading two similar CT scans directly after each other.
The first group of 496 patients had a normal NECT and no clinical indication for CECT, for example lateralising signs.
They concluded that in the acute setting if an NECT is normal the CECT is usually not necessary.
Throughput of patients can be increased if either NECT or CECT were performed.
28% of NECT scans had findings undiagnosed by three reviewers, with a reader error of 1.
The radiation exposure and operational cost could be reduced and patient throughput increased by omitting either NECT or CECT.