Background
Methods
Patients
Ethics approval and consent to participate
Imaging technique
Image assessment
Qualitative analysis of image quality
Image sharpness (anatomical structures: nasal sinus, ear, brain) | |
1. Completely unclear 2. Generally visible 3. Clearly visible | |
Geometric distortion ① Cholesteatoma (size and border) ② Whole image 1. Severe distortion 2. Moderate distortion 3. Mild distortion 4. No distortion | |
Ghosting artifacts (interface of cholesteatoma and the temporal lobe) 1. Severe artifact, unable to distinguish lesions and normal tissues 2. Moderate artifact, part of the lesion can be distinguished from normal tissues 3. Mild artifact, no impact on lesion diagnosis 4. No artifact | |
Overall image quality 1. Nondiagnostic 2. Barely diagnosis 3. Diagnostic 4. Good 5. Excellent |
Quantitative analysis of image quality
Statistical analysis
Results
Qualitative analysis of image quality
Parameters | TGSE | RESOLVE | P value |
---|---|---|---|
Qualitative parameters | |||
1.Imaging sharpness | 2.85 ± 0.35 | 2.73 ± 0.49 | 0.23 |
2.Geometric distortion | 3.97 ± 0.15(whole) 3.95 ± 0.21(lesion) | 3.26 ± 0.76(whole) 3.64 ± 0.48(lesion) | < 0.01 < 0.01 |
3.Ghosting artifacts | 3.92 ± 0.26 | 3.02 ± 0.55 | < 0.01 |
4.Overall imaging quality | 4.85 ± 0.35 | 4.16 ± 0.69 | < 0.01 |
Quantitative parameters | |||
1.SNR (b = 1000s/mm2) | |||
Lesion | 102.3 ± 32.2 | 493.7 ± 241.6 | < 0.01 |
Brainstem | 59.1 ± 15.5 | 289.8 ± 140.9 | < 0.01 |
2.Contrast | 1.79 ± 0.35 | 1.62 ± 0.44 | =0.005 |
3.CNR (b = 1000s/mm2) | 4.33 ± 2.8 | 2.7 ± 2.6 | < 0.01 |
Quantitative analysis of image quality
Location | ADC (mean/×10− 6 mm2/s) | Inter-reader variability (ICC) | ||
---|---|---|---|---|
TGSE | RESOLVE | P value | TGSE RESOLVE | |
Cholesteatoma | 0.763 ± 0.104 | 0.928 ± 0.141 | < 0.01 | 0.637 0.911 |
Brainstem | 0.498 ± 0.103 | 0.773 ± 0.043 | < 0.01 | 0.885 0.759 |