This document defines measurable aspects and features that can be extracted from histograms and temperature graphs related to vascular assessment. It outlines several potential metrics that provide quantitative values, such as peak to peak temperature, time to peak, recovery temperature, and peak to valley pixels. These metrics measure properties like baseline temperature, load pressure, reactive hyperemic response, and blood flow over time.

1. ALGORITHM DEVELOPMENT
Measurable aspects of Histograms: Features that produce actual values & their definitions:
Peak to Peak Temperature = P2PT
Graph #4
Load applied Load released
Peak/max
E
mmHg
▼
A B G
H
C
Occlusion D Time to peak F
A = Baseline Temp
B= Load pressure Hg
C = Time of Load pressure Duration
D = Load release temperature
E = Peak max reactive hyperemic response (temp)
F = Time from load release to peak max reactive hyperemic response
G = Recovery temperature
H = F to G
I = A - G = temperature variant
Graph #5
Load applied Load released Frame 4 Frame 5 Frame 6
Frame 3
Peak/maximum
Frame 1
3 seconds 3 seconds 3 seconds
3 seconds
Baseline
Blood Flow Frame 2
Baseline
15 seconds
3 seconds
Occlusion Time to peak
Duration

2. Peak to Peak Pixels = P2PP
Peak to Valley Pixels (amplitude in pixels) = P2VP
Peak to Valley Temperature = P2VT
Highest Temperature to Lowest Temperature = HTLT
Highest Pixel to Lowest Pixel =HPLP
Number of Peaks in Series = NSP
Length (or number) of Pixels in Series = LPS