Congress:
ECR25
Poster Number:
C-10247
Type:
Poster: EPOS Radiologist (scientific)
Authorblock:
A. W. Marka1, M. Probst2, T. Greve1, N. Graf2, F. A. Probst2, G. Andreisek3, T. Frauenfelder3, M. Folwaczny2, E. Burian3; 1München/DE, 2Munich/DE, 3Zurich/CH
Disclosures:
Alexander Wolfgang Marka:
Nothing to disclose
Monika Probst:
Nothing to disclose
Tobias Greve:
Nothing to disclose
Niklas Graf:
Nothing to disclose
Florian Andreas Probst:
Nothing to disclose
Gustav Andreisek:
Nothing to disclose
Thomas Frauenfelder:
Nothing to disclose
Matthias Folwaczny:
Nothing to disclose
Egon Burian:
Nothing to disclose
Keywords:
Head and neck, MR, Imaging sequences, Inflammation
Detection and Volume Comparison
As shown in Table 2, the analysis revealed:
- 23 lesions: Reactive bone edema on STIR + bone alterations in T1 with corresponding OPT radiolucency
- 15 lesions: Detected by STIR only
- Significant volume differences:
- STIR OPT-positive: 207.3 ± 191.1 mm³
- STIR OPT-negative: 29.5 ± 34.2 mm³ (p < 0.001)
- T1 OPT-positive: 109.3 ± 124.3 mm³
- T1 OPT-negative: 1.9 ± 5.1 mm³ (p < 0.001)
Figure 2 demonstrates a representative case of periapical bone edema visualized by STIR sequence with corresponding T1 changes and OPT findings.
Correlations
Table 3 presents the correlation analysis, showing:
- Strong positive correlation between STIR and T1 volumes (r = 0.794, p < 0.001)
- Significant correlations between PAI ratings and volumes:
- PAI vs. STIR volume: r = 0.583, p < 0.001
- PAI vs. T1 volume: r = 0.630, p < 0.001
- PAI vs. SNR-STIR: r = 0.328, p = 0.044
Diagnostic Performance
As illustrated in Table 4, ROC analysis showed strong discriminatory power:
- Volume T1: AUC = 0.905, p < 0.01
- Volume STIR: AUC = 0.857, p < 0.01
- Optimal diagnostic cut-off points (Youden Index):
- Volume STIR: 42.6 mm³
- Volume T1: 16.1 mm³
- SNR-STIR: 1.35
- SNR-T1: 0.57
Figure 3 shows a clinical example highlighting the differences between OPT-positive and OPT-negative lesions in both STIR and T1 sequences.