RLE and PLE Tools
The Pulse Amplitude Tool is a feature extraction tool that works by comparing the ratio of the pulse amplitude for three pre-stimulus seconds to a five second post-stimulus period beginning 5 seconds after stimulus onset. The PLE feature of interest is the constriction of the post-stimulus pulse-width amplitude when compared to the pre-stimulus pulse-width amplitude. To use the PLE Tool, simply click on the RQ in the question bar while viewing a chart, and read the PLE score from the icon at the CQ that is chosen for comparison.
The PLE Tool follows the same guidelines as the RLE tool.
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+1 | Vasomotor constriction at the CQ is sufficiently less than the RQ. |
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-1 | Vasomotor constriction at the RQ is sufficiently less than the CQ. |
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0 | There is an insufficient difference between the vasomotor constriction at the RQ and CQ. |
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The difference between the RQ and CQ line excursion length has exceeded the optimization threshold. If an artifact is observed in the data then an artifact indication may be entered onto the score sheet. |
Selection of the comparison question for the PLE Tool is similar to that for the RLE tool. The first step is to inspect the evaluation window and a few seconds prior to it to make sure that the data is not unstable or artifacted. If it is, do not evaluate this segment regardless of the recommendation made by the PLE Tool.
When selecting R1, the corresponding CQ node is green. Given this information, the R1 PLE would be scored a plus 1 (+1).
When selecting R2, the corresponding CQ node is red. Given this information, the R2 PLE would be scored a negative 1 (-1).
When selecting R2 in this example, the corresponding CQ node is white. Given this information, the R2 PLE would be scored a zero (0).
When selecting R5 in this example, the bracketing CQs register different colored nodes, one is white and the other is green. Given this information, choose the one that benefits the examinee. In the below example, choose the CQ with the green node and score the R5 PLE as a plus 1 (+1).
When selecting R5 in this example, one node is white and the other is red. Given this information, choose the one that benefits the examinee. In the below example, choose the CQ with the white node and score the R5 PLE as a zero (0).
