Apparent Diffusion Coefficient Values of Middle Ear Cholesteatoma Differ from Abscess and Cholesteatoma Admixed Infection

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Fig 1.
A, ADC value cartography and region of interest to calculate ADC value. B, DW image.
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Fig 2.
A, corresponding calculated ADC value on ADC cartography (0.917 × 10⁻³ mm²/s). B, DW image of a group 1 patient.
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Fig 3.
A, corresponding calculated ADC value on ADC cartography (0.774 × 10⁻³ mm²/s). B, DW image of a group 2 patient.
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Fig 4.
A, corresponding calculated ADC value on ADC cartography (0.570 × 10⁻³ mm²/s). B, DW image of a group 3 patient.

Table 2:

ADC values calculated twice to test the reliability of the measurements

Patient No./Surgical Group	ADC Value (×10⁻³ mm²/s) First Calculation	ADC Value (×10⁻³ mm²/s) Second Calculation
1/g1	0.847	0.866
2/g1	1.054	1.015
3/g1	1.046	1.026
4/g1	0.917	0.805
5/g1	1.047	1.054
6/g1	0.790	0.857
7/g1	0.871	0.832
8/g1	0.698	0.696
9/g1	0.863	0.824
1/g2	0.628	0.668
2/g2	0.774	0.670
3/g2	0.630	0.621
1/g3	0.571	0.531
2/g3	0.568	0.576
3/g3	0.107	0.075

Table 3:

Diagnosis made by DWI alone vs DWI and calculated ADC values

Patient No./Surgical Group	Diagnosis Made by DWI Alone	Diagnosis Inferred by DWI with Calculated ADC Values
1/g1	G1	G1
2/g1	G1	G1
3/g1	G1	G1
4/g1	G1	G1
5/g1	G1	G1
6/g1	G1	G1 or 2
7/g1	G1	G1
8/g1	G1	G2
9/g1	G1	G1
1/g2	G1	G2
2/g2	G1	G1 or 2
3/g2	G1 or 2	G2
1/g3	G2	G3
2/g3	G1 or 2	G3
3/g3	G3	G3

Note:—DWI indicates diffusion-weighted imaging; G1, diagnosed as a group 1 patient; G2, diagnosed as a group 2 patient; G3, diagnosed as a group 3 patient.