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. 2014 Nov 8;15(6):279–294. doi: 10.1120/jacmp.v15i6.4952

Table 2.

Phantom validation data using threshold predictor methods: multiple regression method and Modified Jentzen method.

Phantom Measurements Method 1: Multiple Regression Method Method 2: Modified Jentzen Method
Actual T/B ratio Measured T/B Actual vol. (cc) Baseline thres. Initial Thres. Initial vol. (cc) Final thres. Calc. vol (cc) Error Initial Thres. Initial vol. (cc) Final thres. Calc. vol (cc) Error
13 9.89 0.5 34 30 0.57 33 0.5 0 29 0.66 33 0.5 0
11.87 0.5 30 29 0.51 33 0.43 0.07 27 0.59 32 0.45 0.05
11.13 0.5 34 30 0.58 32 0.51
−0.01
 28 0.66 32 0.51
−0.01
11.53 1 31 29 1.06 30 1.02
−0.02
 28 1.05 30 1.02
−0.02
13.31 1 27 28 0.95 29 0.9 0.1 27 1.02 29 0.9 0.1
10.57 1 30 30 1.01 31 0.96 0.04 28 1.02 31 0.96 0.04
13.13 2 28 29 1.92 28 2.02
−0.02
 27 2.08 28 2.02
−0.02
11.06 2 32 30 2.23 29 2.33
−0.33
 28 2.44 29 2.33
−0.33
13.06 2 32 29 2.15 28 2.25
−0.25
 27 2.38 28 2.25
−0.25
14.22 4 27 28 3.84 27 3.95 0.05 27 4 27 3.95 0.05
14.58 4 27 28 3.96 27 4.08
−0.08
 26 4.17 27 4.08
−0.08
14.15 4 26 28 3.77 27 3.88 0.12 27 3.85 27 3.88 0.12
5 3.57 0.5 51 44 0.67 46 0.62
−0.12
 40 0.82 43 0.68
−0.18
3.08 0.5 49 48 0.55 50 0.48 0.02 43 0.74 47 0.59
−0.09
2.69 0.5 57 52 0.72 52 0.72
−0.22
 46 1.22 48 0.97
−0.47
4.39 1 40 40 1.01 41 0.96 0.04 37 1.2 39 1.1
−0.1
5.15 1 33 38 0.77 39 0.73 0.27 35 0.88 38 0.77 0.23
3.87 1 42 43 1.04 43 1.04
−0.04
 39 1.27 41 1.16
−0.16
3.85 2 49 43 2.72 41 3.04
−1.04
 39 3.23 40 3.19
−1.19
4.41 2 40 40 2.02 39 2.11
−0.11
 37 2.5 38 2.21
−0.21
5.15 2 34 38 1.73 37 1.8 0.2 35 1.92 36 1.89 0.11
4.86 4 40 39 4.09 37 4.44
−0.44
 35 5 36 4.61
−0.61
5.32 4 34 37 3.5 36 3.68 0.32 34 4.17 35 3.87 0.13
5.51 4 33 37 3.46 35 3.77 0.23 34 3.85 34 3.89 0.11
3.5 1.65 0.5 71 70 0.41 72 0.34 0.16 62 1 64 0.7
−0.2
1.59 0.5 72 72 0.5 73 0.46 0.04 63 1.19 65 0.83
−0.33
1.8 0.5 69 66 0.7 66 0.7
−0.2
 58 1.54 60 1.09
−0.59
2.67 1 46 52 0.68 53 0.85 0.15 46 1.05 49 0.85 0.15
2.29 1 56 57 0.99 56 1.04
−0.04
 50 1.47 52 1.27
−0.27
2.3 1 55 56 0.84 56 0.84 0.16 50 1.39 52 1.08
−0.08
2.84 2 51 50 2.14 48 2.36
−0.36
 45 2.94 46 2.59
−0.59
2.61 2 52 52 1.89 51 1.97 0.03 47 2.78 48 2.33
−0.33
2.49 2 53 54 1.84 52 2.04
−0.04
 48 2.56 49 2.39
−0.39
3.14 4 42 47 3.14 45 3.39 0.61 43 3.85 43 3.72 0.28
3.26 4 43 46 3.41 44 3.74 0.26 42 4.35 43 3.93 0.07
3.21 4 44 47 3.45 45 3.73 0.27 42 4.35 43 4.13
−0.13

Error = (Actual Volume‐Calculated Volume).